SEC Info  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Aon plc – ‘10-K’ for 12/31/19 – ‘EX-101.PRE’

On:  Friday, 2/14/20, at 4:40pm ET   ·   For:  12/31/19   ·   Accession #:  1628280-20-1607   ·   File #:  1-07933

Previous ‘10-K’:  ‘10-K’ on 2/19/19 for 12/31/18   ·   Next:  ‘10-K’ on 2/19/21 for 12/31/20   ·   Latest:  ‘10-K/A’ on 4/17/24 for 12/31/23   ·   14 References:   

Find Words in Filings emoji
 
  in    Show  and   Hints

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 2/14/20  Aon plc                           10-K       12/31/19  156:36M                                    Workiva Inc Wde… FA01/FA

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   3.86M 
 3: EX-10.51    Material Contract                                   HTML     52K 
 4: EX-10.58    Material Contract                                   HTML     48K 
 5: EX-10.59    Material Contract                                   HTML     56K 
 6: EX-10.60    Material Contract                                   HTML     53K 
 2: EX-10.7     Material Contract                                   HTML     45K 
 7: EX-21       Subsidiaries List                                   HTML    291K 
 8: EX-23       Consent of Experts or Counsel -- exhibit23          HTML     55K 
 9: EX-31.1     Certification -- §302 - SOA'02                      HTML     51K 
10: EX-31.2     Certification -- §302 - SOA'02                      HTML     51K 
11: EX-32.1     Certification -- §906 - SOA'02                      HTML     45K 
12: EX-32.2     Certification -- §906 - SOA'02                      HTML     45K 
42: R1          Cover                                               HTML    107K 
89: R2          Consolidated Statements of Income                   HTML    155K 
138: R3          Consolidated Statements of Comprehensive Income     HTML     87K  
60: R4          Consolidated Statements of Financial Position       HTML    145K 
44: R5          Consolidated Statements of Financial Position       HTML     50K 
                (Parenthetical)                                                  
91: R6          Consolidated Statements of Shareholders' Equity     HTML    108K 
140: R7          Consolidated Statements of Shareholders' Equity     HTML     46K  
                (Parenthetical)                                                  
61: R8          Consolidated Statements of Cash Flows               HTML    166K 
38: R9          Basis of Presentation                               HTML     48K 
100: R10         Summary of Significant Accounting Principles and    HTML    147K  
                Practices                                                        
148: R11         Revenue from Contracts with Customers               HTML    110K  
72: R12         Other Financial Data                                HTML    140K 
52: R13         Discontinued Operations                             HTML     81K 
102: R14         Restructuring                                       HTML     81K  
150: R15         Acquisitions and Dispositions of Businesses         HTML     73K  
73: R16         Goodwill and Other Intangible Assets                HTML     90K 
53: R17         Debt                                                HTML    100K 
99: R18         Lease Commitments                                   HTML    195K 
151: R19         Income Taxes                                        HTML    209K  
74: R20         Shareholders' Equity                                HTML    170K 
20: R21         Employee Benefits                                   HTML    619K 
111: R22         Share-based Compensation Plans                      HTML    108K  
127: R23         Derivatives and Hedging                             HTML    108K  
76: R24         Fair Value Measurements and Financial Instruments   HTML    137K 
22: R25         Claims, Lawsuits and Other Contingencies            HTML     71K 
113: R26         Segment Information                                 HTML     64K  
129: R27         Guarantee of Registered Securities                  HTML   1.12M  
79: R28         Quarterly Financial Data (Unaudited)                HTML    169K 
19: R29         Summary of Significant Accounting Principles and    HTML    213K 
                Practices (Policies)                                             
47: R30         Summary of Significant Accounting Principles and    HTML    110K 
                Practices (Tables)                                               
69: R31         Revenue from Contracts with Customers (Tables)      HTML    111K 
155: R32         Other Financial Data (Tables)                       HTML    148K  
106: R33         Discontinued Operations (Tables)                    HTML     81K  
45: R34         Restructuring Restructuring and Related Activities  HTML     83K 
                (Tables)                                                         
65: R35         Acquisitions and Dispositions of Businesses         HTML     59K 
                (Tables)                                                         
153: R36         Goodwill and Other Intangible Assets (Tables)       HTML    100K  
104: R37         Debt (Tables)                                       HTML    100K  
50: R38         Lease Commitments (Tables)                          HTML    206K 
64: R39         Income Taxes (Tables)                               HTML    208K 
32: R40         Shareholders' Equity (Tables)                       HTML    167K 
88: R41         Employee Benefits (Tables)                          HTML    615K 
131: R42         Share-based Compensation Plans (Tables)             HTML    107K  
115: R43         Derivatives and Hedging (Tables)                    HTML    101K  
31: R44         Fair Value Measurements and Financial Instruments   HTML    126K 
                (Tables)                                                         
87: R45         Segment Information (Tables)                        HTML     61K 
130: R46         Guarantee of Registered Securities (Tables)         HTML   1.12M  
114: R47         Quarterly Financial Data (Unaudited) (Tables)       HTML    169K  
33: R48         Summary of Significant Accounting Principles and    HTML    125K 
                Practices - Additional Information (Details)                     
86: R49         Summary of Significant Accounting Principles and    HTML     76K 
                Practices - Schedule of Changes to Balance Sheet                 
                for New Accounting Standards (Details)                           
58: R50         Revenue from Contracts with Customers -             HTML     82K 
                Disaggregation of Revenue (Details)                              
41: R51         Revenue from Contracts with Customers - Contract    HTML     60K 
                Assets Rollforward (Details)                                     
90: R52         Other Financial Data - Schedule of Other Income     HTML     61K 
                (Expense) (Details)                                              
139: R53         Other Financial Data - Schedule of Allowance for    HTML     54K  
                Doubtful Accounts (Details)                                      
59: R54         Other Financial Data - Schedule of Other Current    HTML     59K 
                Assets (Details)                                                 
43: R55         Other Financial Data - Components of Fixed Assets,  HTML     70K 
                Net (Details)                                                    
92: R56         Other Financial Data - Schedule of Other            HTML     57K 
                Non-current Assets (Details)                                     
141: R57         Other Financial Data - Schedule of Other Current    HTML     60K  
                Liabilities (Details)                                            
62: R58         Other Financial Data - Schedule of Other            HTML     64K 
                Non-current Liabilities (Details)                                
39: R59         Discontinued Operations - Narrative (Details)       HTML     66K 
119: R60         Discontinued Operations - Income Statement          HTML     88K  
                (Details)                                                        
133: R61         Restructuring - Narrative (Details)                 HTML     58K  
83: R62         Restructuring - Schedule of Restructuring and       HTML     69K 
                Related Expense (Details)                                        
28: R63         Restructuring - Schedule of Restructuring Reserve   HTML     57K 
                (Details)                                                        
120: R64         Acquisitions and Dispositions of Businesses -       HTML     55K  
                Completed Acquisitions Narrative (Details)                       
134: R65         Acquisitions and Dispositions of Businesses -       HTML     88K  
                Schedule of Net Assets Acquired (Details)                        
84: R66         Acquisitions and Dispositions of Businesses -       HTML     59K 
                Completed Dispositions (Details)                                 
29: R67         Goodwill and Other Intangible Assets - Schedule of  HTML     57K 
                changes in the net carrying amount of goodwill                   
                (Details)                                                        
117: R68         Goodwill and Other Intangible Assets - Schedule of  HTML     63K  
                other intangible assets by asset class (Details)                 
137: R69         Goodwill and Other Intangible Assets - Schedule of  HTML     60K  
                estimated future amortization expense on                         
                intangible assets (Details)                                      
146: R70         Debt - Summary of outstanding debt (Details)        HTML    118K  
95: R71         Debt - Narrative (Details)                          HTML     92K 
36: R72         Debt - Repayments of long-term debt (Details)       HTML     70K 
56: R73         Debt - Schedule of Commercial Paper (Details)       HTML     52K 
145: R74         Lease Commitments - Assets and Liabilities of       HTML     62K  
                Lessee (Details)                                                 
94: R75         Lease Commitments - Lease Costs (Details)           HTML     62K 
35: R76         Lease Commitments - Lease Terms and Assumptions     HTML     54K 
                (Details)                                                        
55: R77         Lease Commitments - Cash Flow of Lessee (Details)   HTML     58K 
142: R78         Lease Commitments - Lease Maturity (Details)        HTML    102K  
97: R79         Lease Commitments - Lease Maturity Prior to Topic   HTML     94K 
                842 (Details)                                                    
147: R80         Income Taxes - Income from continuing operations    HTML     73K  
                before income tax (Details)                                      
96: R81         Income Taxes - Narrative (Details)                  HTML     63K 
37: R82         Income Taxes - Reconciliation of the income tax     HTML     86K 
                provisions based on the U.S. statutory corporate                 
                tax rate to the provisions reflected in the                      
                Consolidated Financial Statements (Details)                      
57: R83         Income Taxes - Components of Aon's deferred tax     HTML     97K 
                assets and liabilities (Details)                                 
144: R84         Income Taxes - Deferred income taxes (assets and    HTML     51K  
                liabilities netted by jurisdiction) as classified                
                in the Consolidated Statements of Financial                      
                Position (Details)                                               
93: R85         Income Taxes Operating Loss Carryforwards           HTML     59K 
                (Details)                                                        
34: R86         Income Taxes - Reconciliation of the beginning and  HTML     63K 
                ending amount of unrecognized tax benefits                       
                (Details)                                                        
54: R87         Shareholders' Equity - Distributable Reserves       HTML     45K 
                Narrative (Details)                                              
143: R88         Shareholders' Equity - Ordinary Shares (Details)    HTML     73K  
98: R89         Shareholders' Equity - Schedule of weighted         HTML     55K 
                average shares outstanding (Details)                             
118: R90         Shareholders' Equity - Dividends (Details)          HTML     48K  
132: R91         Shareholders' Equity - Components of Accumulated    HTML     99K  
                other comprehensive loss, net of related tax                     
                (Details)                                                        
82: R92         Employee Benefits - Schedule of expense recognized  HTML     53K 
                in Compensation and benefit in the Consolidated                  
                Statements of Income (Details)                                   
26: R93         Employee Benefits - Pension Plans Narrative         HTML     95K 
                (Details)                                                        
121: R94         Employee Benefits - Reconciliation of the changes   HTML    133K  
                in the benefit obligations and fair value of                     
                assets and a statement of the funded status                      
                (Details)                                                        
135: R95         Employee Benefits - Amounts recognized in the       HTML     73K  
                Consolidated Statements of Financial Position                    
                (Details)                                                        
85: R96         Employee Benefits - Amounts recognized in           HTML     61K 
                Accumulated other comprehensive loss that have not               
                yet been recognized (Details)                                    
30: R97         Employee Benefits - Components of net periodic      HTML     85K 
                benefit cost (Details)                                           
116: R98         Employee Benefits - Weighted-average assumptions    HTML     67K  
                used to determine future benefit obligations                     
                (Details)                                                        
136: R99         Employee Benefits - Weighted-average assumptions    HTML     71K  
                used to determine the net periodic benefit cost                  
                (Details)                                                        
75: R100        Employee Benefits - Expected Return on Plan Assets  HTML     49K 
                Narrative (Details)                                              
21: R101        Employee Benefits - Schedule of Fair Value of U.S   HTML    117K 
                Plan Assets (Details)                                            
110: R102        Employee Benefits - Schedule of Fair Value of U.K.  HTML    115K  
                Plan Assets (Details)                                            
126: R103        Employee Benefits - Schedule of changes in Level 3  HTML     61K  
                fair value for U.K. Pension Plans (Details)                      
77: R104        Employee Benefits - Schedule of Fair Value of       HTML     96K 
                Other Plan Assets (Details)                                      
23: R105        Employee Benefits - Investment Policy and Strategy  HTML     60K 
                Narrative (Details)                                              
112: R106        Employee Benefits - Cash Flows Narrative (Details)  HTML     62K  
128: R107        Employee Benefits - Estimated Future Benefit        HTML     68K  
                Payments (Details)                                               
78: R108        Employee Benefits - Overview of the accumulated     HTML     63K 
                benefit obligation, fair value of plan assets,                   
                funded status and net amount recognized for U.S.                 
                and Canadian Other Post-Retirement Benefits                      
                (Details)                                                        
18: R109        Employee Benefits - Schedule of Other information   HTML     58K 
                related to Company's other post-retirement plan's                
                (Details)                                                        
48: R110        Employee Benefits - U.S. and Canadian Other         HTML     90K 
                Post-Retirement Benefits Narrative (Details)                     
70: R111        Share-based Compensation Plans - Share-based        HTML     59K 
                compensation expense recognized in continuing                    
                operations (Details)                                             
154: R112        Share-based Compensation Plans - Restricted Share   HTML     61K  
                Units Narrative (Details)                                        
105: R113        Share-based Compensation Plans - Summary of the     HTML     70K  
                status of the Company's RSUs (Details)                           
46: R114        Share-based Compensation Plans - Performance Share  HTML     64K 
                Awards Narrative (Details)                                       
67: R115        Share-based Compensation Plans - Schedule of        HTML     54K 
                Performance-based plans (Details)                                
152: R116        Derivatives and Hedging - Narrative (Details)       HTML     71K  
103: R117        Derivatives and Hedging - Notional and fair values  HTML     72K  
                of derivative instruments (Details)                              
49: R118        Derivatives and Hedging - Schedule of amounts of    HTML     71K 
                derivative gains (losses) recognized in the                      
                Consolidated Financial Statements (Details)                      
63: R119        Fair Value Measurements and Financial Instruments   HTML     83K 
                - Schedule of assets and liabilities that are                    
                measured at fair value on a recurring basis                      
                (Details)                                                        
125: R120        Fair Value Measurements and Financial Instruments   HTML     47K  
                - Narrative (Details)                                            
108: R121        Fair Value Measurements and Financial Instruments   HTML     53K  
                - Schedule of financial instruments where the                    
                carrying amounts and fair values differ (Details)                
25: R122        Claims, Lawsuits, and Other Contingencies - Legal   HTML     80K 
                Narrative (Details)                                              
81: R123        Claims, Lawsuits, and Other Contingencies -         HTML     55K 
                Guarantees and Indemnifications Narrative                        
                (Details)                                                        
124: R124        Claims, Lawsuits, and Other Contingencies -         HTML     45K  
                Letters of Credit Narrative (Details)                            
107: R125        Claims, Lawsuits, and Other Contingencies -         HTML     45K  
                Premium Payments (Details)                                       
24: R126        Segment Information - Narrative (Details)           HTML     48K 
80: R127        Segment Information - Schedule of consolidated      HTML     62K 
                non-current assets by geographic area (Details)                  
123: R128        Guarantee of Registered Securities - Narrative      HTML     86K  
                (Details)                                                        
109: R129        Guarantee of Registered Securities - Condensed      HTML    190K  
                Consolidating Statement of Income (Details)                      
101: R130        Guarantee of Registered Securities - Condensed      HTML    133K  
                Consolidating Statement of Comprehensive Income                  
                (Details)                                                        
149: R131        Guarantee of Registered Securities - Condensed      HTML    218K  
                Consolidating Statement of Financial Position                    
                (Details)                                                        
71: R132        Guarantee of Registered Securities - Condensed      HTML    167K 
                Consolidating Statement of Cash Flows (Details)                  
51: R133        Quarterly Financial Data (Unaudited) (Details)      HTML    112K 
66: R9999       Uncategorized Items - aonplc201910-k.htm            HTML     50K 
27: XML         IDEA XML File -- Filing Summary                      XML    293K 
40: XML         XBRL Instance -- aonplc201910-k_htm                  XML  10.20M 
68: EXCEL       IDEA Workbook of Financial Reports                  XLSX    201K 
14: EX-101.CAL  XBRL Calculations -- aon-20191231_cal                XML    548K 
15: EX-101.DEF  XBRL Definitions -- aon-20191231_def                 XML   1.56M 
16: EX-101.LAB  XBRL Labels -- aon-20191231_lab                      XML   3.08M 
17: EX-101.PRE  XBRL Presentations -- aon-20191231_pre               XML   2.29M 
13: EX-101.SCH  XBRL Schema -- aon-20191231                          XSD    337K 
156: JSON        XBRL Instance as JSON Data -- MetaLinks              677±  1.05M  
122: ZIP         XBRL Zipped Folder -- 0001628280-20-001607-xbrl      Zip    711K  


‘EX-101.PRE’   —   XBRL Presentations — aon-20191231_pre


This Exhibit is an XBRL XML File.


                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<!-- XBRL Document Created with Wdesk from Workiva -->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<link:roleRef roleURI="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinesses" xlink:href="aon-20191231.xsd#AcquisitionsAndDispositionsOfBusinesses" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesCompletedAcquisitionsNarrativeDetails" xlink:href="aon-20191231.xsd#AcquisitionsAndDispositionsOfBusinessesCompletedAcquisitionsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesCompletedDispositionsDetails" xlink:href="aon-20191231.xsd#AcquisitionsAndDispositionsOfBusinessesCompletedDispositionsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesScheduleOfNetAssetsAcquiredDetails" xlink:href="aon-20191231.xsd#AcquisitionsAndDispositionsOfBusinessesScheduleOfNetAssetsAcquiredDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesTables" xlink:href="aon-20191231.xsd#AcquisitionsAndDispositionsOfBusinessesTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/BasisOfPresentation" xlink:href="aon-20191231.xsd#BasisOfPresentation" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingencies" xlink:href="aon-20191231.xsd#ClaimsLawsuitsAndOtherContingencies" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesGuaranteesAndIndemnificationsNarrativeDetails" xlink:href="aon-20191231.xsd#ClaimsLawsuitsAndOtherContingenciesGuaranteesAndIndemnificationsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesLegalNarrativeDetails" xlink:href="aon-20191231.xsd#ClaimsLawsuitsAndOtherContingenciesLegalNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesLettersOfCreditNarrativeDetails" xlink:href="aon-20191231.xsd#ClaimsLawsuitsAndOtherContingenciesLettersOfCreditNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesPremiumPaymentsDetails" xlink:href="aon-20191231.xsd#ClaimsLawsuitsAndOtherContingenciesPremiumPaymentsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfFinancialPosition" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfFinancialPosition" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfFinancialPositionParenthetical" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfFinancialPositionParenthetical" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfIncome" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfIncome" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfShareholdersEquity" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsOfShareholdersEquityParenthetical" xlink:href="aon-20191231.xsd#ConsolidatedStatementsOfShareholdersEquityParenthetical" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/Cover" xlink:href="aon-20191231.xsd#Cover" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/Debt" xlink:href="aon-20191231.xsd#Debt" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DebtNarrativeDetails" xlink:href="aon-20191231.xsd#DebtNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DebtRepaymentsOfLongTermDebtDetails" xlink:href="aon-20191231.xsd#DebtRepaymentsOfLongTermDebtDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DebtScheduleOfCommercialPaperDetails" xlink:href="aon-20191231.xsd#DebtScheduleOfCommercialPaperDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DebtSummaryOfOutstandingDebtDetails" xlink:href="aon-20191231.xsd#DebtSummaryOfOutstandingDebtDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DebtTables" xlink:href="aon-20191231.xsd#DebtTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DerivativesAndHedging" xlink:href="aon-20191231.xsd#DerivativesAndHedging" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DerivativesAndHedgingNarrativeDetails" xlink:href="aon-20191231.xsd#DerivativesAndHedgingNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DerivativesAndHedgingNotionalAndFairValuesOfDerivativeInstrumentsDetails" xlink:href="aon-20191231.xsd#DerivativesAndHedgingNotionalAndFairValuesOfDerivativeInstrumentsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DerivativesAndHedgingScheduleOfAmountsOfDerivativeGainsLossesRecognizedInConsolidatedFinancialStatementsDetails" xlink:href="aon-20191231.xsd#DerivativesAndHedgingScheduleOfAmountsOfDerivativeGainsLossesRecognizedInConsolidatedFinancialStatementsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DerivativesAndHedgingTables" xlink:href="aon-20191231.xsd#DerivativesAndHedgingTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DiscontinuedOperations" xlink:href="aon-20191231.xsd#DiscontinuedOperations" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DiscontinuedOperationsIncomeStatementDetails" xlink:href="aon-20191231.xsd#DiscontinuedOperationsIncomeStatementDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DiscontinuedOperationsNarrativeDetails" xlink:href="aon-20191231.xsd#DiscontinuedOperationsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/DiscontinuedOperationsTables" xlink:href="aon-20191231.xsd#DiscontinuedOperationsTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefits" xlink:href="aon-20191231.xsd#EmployeeBenefits" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsAmountsRecognizedInAccumulatedOtherComprehensiveLossThatHaveNotYetBeenRecognizedDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsAmountsRecognizedInAccumulatedOtherComprehensiveLossThatHaveNotYetBeenRecognizedDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsAmountsRecognizedInConsolidatedStatementsOfFinancialPositionDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsAmountsRecognizedInConsolidatedStatementsOfFinancialPositionDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsCashFlowsNarrativeDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsCashFlowsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsComponentsOfNetPeriodicBenefitCostDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsComponentsOfNetPeriodicBenefitCostDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsExpectedReturnOnPlanAssetsNarrativeDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsExpectedReturnOnPlanAssetsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsInvestmentPolicyAndStrategyNarrativeDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsInvestmentPolicyAndStrategyNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsOverviewOfAccumulatedBenefitObligationFairValueOfPlanAssetsFundedStatusAndNetAmountRecognizedForUSAndCanadianOtherPostRetirementBenefitsDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsOverviewOfAccumulatedBenefitObligationFairValueOfPlanAssetsFundedStatusAndNetAmountRecognizedForUSAndCanadianOtherPostRetirementBenefitsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsPensionPlansNarrativeDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsPensionPlansNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsReconciliationOfChangesInBenefitObligationsAndFairValueOfAssetsAndStatementOfFundedStatusDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsReconciliationOfChangesInBenefitObligationsAndFairValueOfAssetsAndStatementOfFundedStatusDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleOfChangesInLevel3FairValueForUKPensionPlansDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsScheduleOfChangesInLevel3FairValueForUKPensionPlansDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleOfExpenseRecognizedInCompensationAndBenefitInConsolidatedStatementsOfIncomeDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsScheduleOfExpenseRecognizedInCompensationAndBenefitInConsolidatedStatementsOfIncomeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleOfFairValueOfOtherPlanAssetsDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsScheduleOfFairValueOfOtherPlanAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleOfFairValueOfUKPlanAssetsDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsScheduleOfFairValueOfUKPlanAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleOfFairValueOfUSPlanAssetsDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsScheduleOfFairValueOfUSPlanAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleOfOtherInformationRelatedToCompanysOtherPostRetirementPlansDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsScheduleOfOtherInformationRelatedToCompanysOtherPostRetirementPlansDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsTables" xlink:href="aon-20191231.xsd#EmployeeBenefitsTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsUSAndCanadianOtherPostRetirementBenefitsNarrativeDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsUSAndCanadianOtherPostRetirementBenefitsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsWeightedAverageAssumptionsUsedToDetermineFutureBenefitObligationsDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsWeightedAverageAssumptionsUsedToDetermineFutureBenefitObligationsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostDetails" xlink:href="aon-20191231.xsd#EmployeeBenefitsWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstruments" xlink:href="aon-20191231.xsd#FairValueMeasurementsAndFinancialInstruments" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsNarrativeDetails" xlink:href="aon-20191231.xsd#FairValueMeasurementsAndFinancialInstrumentsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsScheduleOfAssetsAndLiabilitiesThatAreMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="aon-20191231.xsd#FairValueMeasurementsAndFinancialInstrumentsScheduleOfAssetsAndLiabilitiesThatAreMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsScheduleOfFinancialInstrumentsWhereCarryingAmountsAndFairValuesDifferDetails" xlink:href="aon-20191231.xsd#FairValueMeasurementsAndFinancialInstrumentsScheduleOfFinancialInstrumentsWhereCarryingAmountsAndFairValuesDifferDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsTables" xlink:href="aon-20191231.xsd#FairValueMeasurementsAndFinancialInstrumentsTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GoodwillAndOtherIntangibleAssets" xlink:href="aon-20191231.xsd#GoodwillAndOtherIntangibleAssets" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfChangesInNetCarryingAmountOfGoodwillDetails" xlink:href="aon-20191231.xsd#GoodwillAndOtherIntangibleAssetsScheduleOfChangesInNetCarryingAmountOfGoodwillDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfEstimatedFutureAmortizationExpenseOnIntangibleAssetsDetails" xlink:href="aon-20191231.xsd#GoodwillAndOtherIntangibleAssetsScheduleOfEstimatedFutureAmortizationExpenseOnIntangibleAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfOtherIntangibleAssetsByAssetClassDetails" xlink:href="aon-20191231.xsd#GoodwillAndOtherIntangibleAssetsScheduleOfOtherIntangibleAssetsByAssetClassDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsTables" xlink:href="aon-20191231.xsd#GoodwillAndOtherIntangibleAssetsTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecurities" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecurities" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfCashFlowsDetails" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfCashFlowsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfComprehensiveIncomeDetails" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfComprehensiveIncomeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfFinancialPositionDetails" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfFinancialPositionDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfIncomeDetails" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfIncomeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesNarrativeDetails" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecuritiesNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesTables" xlink:href="aon-20191231.xsd#GuaranteeOfRegisteredSecuritiesTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxes" xlink:href="aon-20191231.xsd#IncomeTaxes" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesComponentsOfAonsDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="aon-20191231.xsd#IncomeTaxesComponentsOfAonsDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesDeferredIncomeTaxesAssetsAndLiabilitiesNettedByJurisdictionAsClassifiedInConsolidatedStatementsOfFinancialPositionDetails" xlink:href="aon-20191231.xsd#IncomeTaxesDeferredIncomeTaxesAssetsAndLiabilitiesNettedByJurisdictionAsClassifiedInConsolidatedStatementsOfFinancialPositionDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesIncomeFromContinuingOperationsBeforeIncomeTaxDetails" xlink:href="aon-20191231.xsd#IncomeTaxesIncomeFromContinuingOperationsBeforeIncomeTaxDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesNarrativeDetails" xlink:href="aon-20191231.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesOperatingLossCarryforwardsDetails" xlink:href="aon-20191231.xsd#IncomeTaxesOperatingLossCarryforwardsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:href="aon-20191231.xsd#IncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesReconciliationOfIncomeTaxProvisionsBasedOnUSStatutoryCorporateTaxRateToProvisionsReflectedInConsolidatedFinancialStatementsDetails" xlink:href="aon-20191231.xsd#IncomeTaxesReconciliationOfIncomeTaxProvisionsBasedOnUSStatutoryCorporateTaxRateToProvisionsReflectedInConsolidatedFinancialStatementsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesTables" xlink:href="aon-20191231.xsd#IncomeTaxesTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitments" xlink:href="aon-20191231.xsd#LeaseCommitments" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsAssetsAndLiabilitiesOfLesseeDetails" xlink:href="aon-20191231.xsd#LeaseCommitmentsAssetsAndLiabilitiesOfLesseeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsCashFlowOfLesseeDetails" xlink:href="aon-20191231.xsd#LeaseCommitmentsCashFlowOfLesseeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseCostsDetails" xlink:href="aon-20191231.xsd#LeaseCommitmentsLeaseCostsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseMaturityDetails" xlink:href="aon-20191231.xsd#LeaseCommitmentsLeaseMaturityDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseMaturityPriorToTopic842Details" xlink:href="aon-20191231.xsd#LeaseCommitmentsLeaseMaturityPriorToTopic842Details" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseTermsAndAssumptionsDetails" xlink:href="aon-20191231.xsd#LeaseCommitmentsLeaseTermsAndAssumptionsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsTables" xlink:href="aon-20191231.xsd#LeaseCommitmentsTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialData" xlink:href="aon-20191231.xsd#OtherFinancialData" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataComponentsOfFixedAssetsNetDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataComponentsOfFixedAssetsNetDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleOfAllowanceForDoubtfulAccountsDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataScheduleOfAllowanceForDoubtfulAccountsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherCurrentAssetsDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataScheduleOfOtherCurrentAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherCurrentLiabilitiesDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataScheduleOfOtherCurrentLiabilitiesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherIncomeExpenseDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataScheduleOfOtherIncomeExpenseDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherNonCurrentAssetsDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataScheduleOfOtherNonCurrentAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherNonCurrentLiabilitiesDetails" xlink:href="aon-20191231.xsd#OtherFinancialDataScheduleOfOtherNonCurrentLiabilitiesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataTables" xlink:href="aon-20191231.xsd#OtherFinancialDataTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/QuarterlyFinancialDataUnaudited" xlink:href="aon-20191231.xsd#QuarterlyFinancialDataUnaudited" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/QuarterlyFinancialDataUnauditedDetails" xlink:href="aon-20191231.xsd#QuarterlyFinancialDataUnauditedDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/QuarterlyFinancialDataUnauditedTables" xlink:href="aon-20191231.xsd#QuarterlyFinancialDataUnauditedTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/Restructuring" xlink:href="aon-20191231.xsd#Restructuring" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RestructuringNarrativeDetails" xlink:href="aon-20191231.xsd#RestructuringNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RestructuringRestructuringAndRelatedActivitiesTables" xlink:href="aon-20191231.xsd#RestructuringRestructuringAndRelatedActivitiesTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RestructuringScheduleOfRestructuringAndRelatedExpenseDetails" xlink:href="aon-20191231.xsd#RestructuringScheduleOfRestructuringAndRelatedExpenseDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RestructuringScheduleOfRestructuringReserveDetails" xlink:href="aon-20191231.xsd#RestructuringScheduleOfRestructuringReserveDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RevenueFromContractsWithCustomers" xlink:href="aon-20191231.xsd#RevenueFromContractsWithCustomers" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RevenueFromContractsWithCustomersContractAssetsRollforwardDetails" xlink:href="aon-20191231.xsd#RevenueFromContractsWithCustomersContractAssetsRollforwardDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RevenueFromContractsWithCustomersDisaggregationOfRevenueDetails" xlink:href="aon-20191231.xsd#RevenueFromContractsWithCustomersDisaggregationOfRevenueDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/RevenueFromContractsWithCustomersTables" xlink:href="aon-20191231.xsd#RevenueFromContractsWithCustomersTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SegmentInformation" xlink:href="aon-20191231.xsd#SegmentInformation" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SegmentInformationNarrativeDetails" xlink:href="aon-20191231.xsd#SegmentInformationNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SegmentInformationScheduleOfConsolidatedNonCurrentAssetsByGeographicAreaDetails" xlink:href="aon-20191231.xsd#SegmentInformationScheduleOfConsolidatedNonCurrentAssetsByGeographicAreaDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SegmentInformationTables" xlink:href="aon-20191231.xsd#SegmentInformationTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlans" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlans" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansPerformanceShareAwardsNarrativeDetails" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlansPerformanceShareAwardsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansRestrictedShareUnitsNarrativeDetails" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlansRestrictedShareUnitsNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansScheduleOfPerformanceBasedPlansDetails" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlansScheduleOfPerformanceBasedPlansDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansShareBasedCompensationExpenseRecognizedInContinuingOperationsDetails" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlansShareBasedCompensationExpenseRecognizedInContinuingOperationsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansSummaryOfStatusOfCompanysRsusDetails" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlansSummaryOfStatusOfCompanysRsusDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansTables" xlink:href="aon-20191231.xsd#ShareBasedCompensationPlansTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquity" xlink:href="aon-20191231.xsd#ShareholdersEquity" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityComponentsOfAccumulatedOtherComprehensiveLossNetOfRelatedTaxDetails" xlink:href="aon-20191231.xsd#ShareholdersEquityComponentsOfAccumulatedOtherComprehensiveLossNetOfRelatedTaxDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityDistributableReservesNarrativeDetails" xlink:href="aon-20191231.xsd#ShareholdersEquityDistributableReservesNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityDividendsDetails" xlink:href="aon-20191231.xsd#ShareholdersEquityDividendsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityOrdinarySharesDetails" xlink:href="aon-20191231.xsd#ShareholdersEquityOrdinarySharesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityScheduleOfWeightedAverageSharesOutstandingDetails" xlink:href="aon-20191231.xsd#ShareholdersEquityScheduleOfWeightedAverageSharesOutstandingDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityTables" xlink:href="aon-20191231.xsd#ShareholdersEquityTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPractices" xlink:href="aon-20191231.xsd#SummaryOfSignificantAccountingPrinciplesAndPractices" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesAdditionalInformationDetails" xlink:href="aon-20191231.xsd#SummaryOfSignificantAccountingPrinciplesAndPracticesAdditionalInformationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesPolicies" xlink:href="aon-20191231.xsd#SummaryOfSignificantAccountingPrinciplesAndPracticesPolicies" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesScheduleOfChangesToBalanceSheetForNewAccountingStandardsDetails" xlink:href="aon-20191231.xsd#SummaryOfSignificantAccountingPrinciplesAndPracticesScheduleOfChangesToBalanceSheetForNewAccountingStandardsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesTables" xlink:href="aon-20191231.xsd#SummaryOfSignificantAccountingPrinciplesAndPracticesTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple"/>
<link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinesses" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_6123AE87ABE0052D19EED7486B878C98" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock" xlink:label="loc_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock_DB84CE24CA008B9DEF5FD7486B87030C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_6123AE87ABE0052D19EED7486B878C98" xlink:to="loc_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock_DB84CE24CA008B9DEF5FD7486B87030C" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesCompletedAcquisitionsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_BEA6469F064B2CB553F520B1807F741F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_E0115C67EEA4964D235920B1807FEB70" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_BEA6469F064B2CB553F520B1807F741F" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_E0115C67EEA4964D235920B1807FEB70" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_05CAB1C46CF5CE18FFD420B1807F328A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_E0115C67EEA4964D235920B1807FEB70" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_05CAB1C46CF5CE18FFD420B1807F328A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_10EB8ED8D7C32B211B6020B1807FF185" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_05CAB1C46CF5CE18FFD420B1807F328A" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_10EB8ED8D7C32B211B6020B1807FF185" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherGeneralExpensesMember" xlink:label="loc_aon_OtherGeneralExpensesMember_17B0681931A80864F0AB20B18080E933" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_10EB8ED8D7C32B211B6020B1807FF185" xlink:to="loc_aon_OtherGeneralExpensesMember_17B0681931A80864F0AB20B18080E933" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_6DE385D436883901733F20B18080B3AC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_E0115C67EEA4964D235920B1807FEB70" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_6DE385D436883901733F20B18080B3AC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfBusinessesAcquired" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_614F4C48C674AB18338820B180800ED3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6DE385D436883901733F20B18080B3AC" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_614F4C48C674AB18338820B180800ED3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_32BF7F63D43D9480D62320B1808064C4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6DE385D436883901733F20B18080B3AC" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_32BF7F63D43D9480D62320B1808064C4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_A9A548E90A73E9E3F35E20B180817052" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6DE385D436883901733F20B18080B3AC" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_A9A548E90A73E9E3F35E20B180817052" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_0B9CB396EDD9075B176B20B180811B48" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6DE385D436883901733F20B18080B3AC" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_0B9CB396EDD9075B176B20B180811B48" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesCompletedDispositionsDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_95BA5B913E05B90506CD25280D0C72AA" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_13488707F35EA621F22B25280D0C870E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_95BA5B913E05B90506CD25280D0C72AA" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_13488707F35EA621F22B25280D0C870E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_D2B9564B75FE61D0FB6F25280D0CF610" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_13488707F35EA621F22B25280D0C870E" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_D2B9564B75FE61D0FB6F25280D0CF610" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_E883ECD3CEC729B2615425280D0D21CE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_D2B9564B75FE61D0FB6F25280D0CF610" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_E883ECD3CEC729B2615425280D0D21CE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_D5DB7F2F968673B23D3125280D0DD89C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_E883ECD3CEC729B2615425280D0D21CE" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_D5DB7F2F968673B23D3125280D0DD89C" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssetsMember" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssetsMember_C13C8C59EFF17BF0244A25280D0DD27D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_D5DB7F2F968673B23D3125280D0DD89C" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssetsMember_C13C8C59EFF17BF0244A25280D0DD27D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_029CAD03CD71D9F0DFC725280D0EA1B7" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_D2B9564B75FE61D0FB6F25280D0CF610" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_029CAD03CD71D9F0DFC725280D0EA1B7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_EC5CBA61B22BF80E4F5625280D0EC3C3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_029CAD03CD71D9F0DFC725280D0EA1B7" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_EC5CBA61B22BF80E4F5625280D0EC3C3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationsMember_A5F853CC6ED07B041C3525280D0ED2F9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_EC5CBA61B22BF80E4F5625280D0EC3C3" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationsMember_A5F853CC6ED07B041C3525280D0ED2F9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_BCCA91343647A3E12B8625280D0E2BBF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_EC5CBA61B22BF80E4F5625280D0EC3C3" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_BCCA91343647A3E12B8625280D0E2BBF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2FD7DF9D28AB23B92A7A25280D0FD03B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_D2B9564B75FE61D0FB6F25280D0CF610" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2FD7DF9D28AB23B92A7A25280D0FD03B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NumberOfDispositions" xlink:label="loc_aon_NumberOfDispositions_7007F13909463CACD12025280D0F94A9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2FD7DF9D28AB23B92A7A25280D0FD03B" xlink:to="loc_aon_NumberOfDispositions_7007F13909463CACD12025280D0F94A9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_E5DB57B2361D40933F6225280D0F419E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2FD7DF9D28AB23B92A7A25280D0FD03B" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_E5DB57B2361D40933F6225280D0F419E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2FD7DF9D28AB23B92A7A25280D0FD03B" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesScheduleOfNetAssetsAcquiredDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_D81C4A630C72FDAE24FF2030B52C849E" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49610054615288BF7E99206B5EDE985B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_D81C4A630C72FDAE24FF2030B52C849E" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49610054615288BF7E99206B5EDE985B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_EE54D28FFC76F3C6988D206B85666741" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49610054615288BF7E99206B5EDE985B" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_EE54D28FFC76F3C6988D206B85666741" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B945BD2B4BC91409D55C206B856DE9A2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_EE54D28FFC76F3C6988D206B85666741" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B945BD2B4BC91409D55C206B856DE9A2" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2018And2019AcquisitionsMember" xlink:label="loc_aon_A2018And2019AcquisitionsMember_915F9D3EB3B815D46E96206CE3B137C7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B945BD2B4BC91409D55C206B856DE9A2" xlink:to="loc_aon_A2018And2019AcquisitionsMember_915F9D3EB3B815D46E96206CE3B137C7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_69A2AA63E74704D484D8206B5EEDABB8" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49610054615288BF7E99206B5EDE985B" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_69A2AA63E74704D484D8206B5EEDABB8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_53C15009BC611AB9A9582030B52DB586" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_69A2AA63E74704D484D8206B5EEDABB8" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_53C15009BC611AB9A9582030B52DB586" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_BEB5699A0CE35863E3962030B52DA404" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_53C15009BC611AB9A9582030B52DB586" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_BEB5699A0CE35863E3962030B52DA404" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_CD8C2AA748BDD7C64B332030B52D1876" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_53C15009BC611AB9A9582030B52DB586" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_CD8C2AA748BDD7C64B332030B52D1876" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_CEAF66C188D2CE8123542030B52D99FF" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_53C15009BC611AB9A9582030B52DB586" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_CEAF66C188D2CE8123542030B52D99FF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_69A2AA63E74704D484D8206B5EEDABB8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_8C502C0B059A5D69623F2030B52E1C04" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_8C502C0B059A5D69623F2030B52E1C04" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_F679C4289B0B83B123942030B52E2C4B" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_F679C4289B0B83B123942030B52E2C4B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_3DC9D840E65B282FDF902030B52E94E3" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_us-gaap_Goodwill_3DC9D840E65B282FDF902030B52E94E3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_37A2E35BDF8A22E2F1D42030B52E18D7" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_37A2E35BDF8A22E2F1D42030B52E18D7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_CFBBDB85DF8A75A03CE32030B52F16F1" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_CFBBDB85DF8A75A03CE32030B52F16F1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_29F50D5E45F192CEBF5B2030B52FC3BC" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_29F50D5E45F192CEBF5B2030B52FC3BC" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" xlink:label="loc_aon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_E39B25F2123A06808D072030B52F48E0" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_1DE4FAFF9D5BFD86E4B32030B52DA587" xlink:to="loc_aon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_E39B25F2123A06808D072030B52F48E0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_B8CA324CE10611C8D9152030B52F9405" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_69A2AA63E74704D484D8206B5EEDABB8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_B8CA324CE10611C8D9152030B52F9405" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_CE711408E88828C78FEB2030B52F5F25" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_B8CA324CE10611C8D9152030B52F9405" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_CE711408E88828C78FEB2030B52F5F25" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_44A3F73394C74D3071CB2030B5308975" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_B8CA324CE10611C8D9152030B52F9405" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_44A3F73394C74D3071CB2030B5308975" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_E2C87B0023763DCAEAA02030B5301281" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_B8CA324CE10611C8D9152030B52F9405" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_E2C87B0023763DCAEAA02030B5301281" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_14B688671EDDBAC58E212030B53094B0" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_69A2AA63E74704D484D8206B5EEDABB8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_14B688671EDDBAC58E212030B53094B0" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsAndDispositionsOfBusinessesTables" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_ABF753E0B36189C45857D74869B2EFAD" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_366794D1101520CE6858D74869B3943C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_ABF753E0B36189C45857D74869B2EFAD" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_366794D1101520CE6858D74869B3943C" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/BasisOfPresentation" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_019DB68A0208A2688092D7486826F4FE" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_4F0D27964F80962FBB7ED7486826322F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_019DB68A0208A2688092D7486826F4FE" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_4F0D27964F80962FBB7ED7486826322F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingencies" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9D010F1BC14F766232ADD74868455D24" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9D010F1BC14F766232ADD74868455D24" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesGuaranteesAndIndemnificationsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_6381C43827D95F97335BD7486AD98B29" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_626E073798BB8F1E1BA6D7486AD99C52" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_6381C43827D95F97335BD7486AD98B29" xlink:to="loc_us-gaap_LossContingenciesTable_626E073798BB8F1E1BA6D7486AD99C52" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_CB34AD92EEFA1447294ED7486AD91540" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_626E073798BB8F1E1BA6D7486AD99C52" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_CB34AD92EEFA1447294ED7486AD91540" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_632FAA1C2CC2ECA5CB6ED7486ADA2F7E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_CB34AD92EEFA1447294ED7486AD91540" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_632FAA1C2CC2ECA5CB6ED7486ADA2F7E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_BD6A6C8109A87E051CF6D7486ADA6066" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_632FAA1C2CC2ECA5CB6ED7486ADA2F7E" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_BD6A6C8109A87E051CF6D7486ADA6066" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4B04AF072348C37AE23CD7486ADA9AB1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_626E073798BB8F1E1BA6D7486AD99C52" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4B04AF072348C37AE23CD7486ADA9AB1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_7783AEE718101A8C14BED7486ADAA116" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4B04AF072348C37AE23CD7486ADA9AB1" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_7783AEE718101A8C14BED7486ADAA116" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TempoBusinessMember" xlink:label="loc_aon_TempoBusinessMember_BEE990AD32EC3EABAF5AD7486ADB3C8A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_7783AEE718101A8C14BED7486ADAA116" xlink:to="loc_aon_TempoBusinessMember_BEE990AD32EC3EABAF5AD7486ADB3C8A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_9D359C595F3361B4587FD7486ADB5DB2" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_626E073798BB8F1E1BA6D7486AD99C52" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_9D359C595F3361B4587FD7486ADB5DB2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_F4CF6B83D10180BDB7A5D7486ADBBC66" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_9D359C595F3361B4587FD7486ADB5DB2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_F4CF6B83D10180BDB7A5D7486ADBBC66" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyLeaseGuaranteeMember" xlink:label="loc_us-gaap_PropertyLeaseGuaranteeMember_F556AEBABC3CC2581E3CD7486ADB3391" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_F4CF6B83D10180BDB7A5D7486ADBBC66" xlink:to="loc_us-gaap_PropertyLeaseGuaranteeMember_F556AEBABC3CC2581E3CD7486ADB3391" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceGuaranteeMember" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_5EB7F73E34A70BB21C44D7486ADC16B1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_F4CF6B83D10180BDB7A5D7486ADBBC66" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_5EB7F73E34A70BB21C44D7486ADC16B1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_BABBC32AB57E05A2251CD7486ADC43AF" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_626E073798BB8F1E1BA6D7486AD99C52" xlink:to="loc_us-gaap_LossContingenciesLineItems_BABBC32AB57E05A2251CD7486ADC43AF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_AD2F6CE40AD9F6CB7036D7486ADC09B9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_BABBC32AB57E05A2251CD7486ADC43AF" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_AD2F6CE40AD9F6CB7036D7486ADC09B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_2FA81EC50BF3BFD10079D7486ADC31B2" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_BABBC32AB57E05A2251CD7486ADC43AF" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_2FA81EC50BF3BFD10079D7486ADC31B2" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesLegalNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_17C420A7667B6F8CDCB3FC243F10D84A" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_17C420A7667B6F8CDCB3FC243F10D84A" xlink:to="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_C61FA0CD10F949866990FC243F1007FA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_C61FA0CD10F949866990FC243F1007FA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_C3635B46E861032BF40CFC243F11D8F0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_C61FA0CD10F949866990FC243F1007FA" xlink:to="loc_us-gaap_LossContingencyNatureDomain_C3635B46E861032BF40CFC243F11D8F0" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_PotentialClaimforPensionAdvisoryServicesMember" xlink:label="loc_aon_PotentialClaimforPensionAdvisoryServicesMember_8E4F3A56DAF0DFA34EBAFC243F119981" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingencyNatureDomain_C3635B46E861032BF40CFC243F11D8F0" xlink:to="loc_aon_PotentialClaimforPensionAdvisoryServicesMember_8E4F3A56DAF0DFA34EBAFC243F119981" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesByIndustryAxis" xlink:label="loc_us-gaap_EquitySecuritiesByIndustryAxis_781D927CF15D7E150E80FC243F118484" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:to="loc_us-gaap_EquitySecuritiesByIndustryAxis_781D927CF15D7E150E80FC243F118484" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="loc_us-gaap_EquitySecuritiesIndustryMember_07F5FA55F1AF2DEFC2CBFC243F11B8A5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesByIndustryAxis_781D927CF15D7E150E80FC243F118484" xlink:to="loc_us-gaap_EquitySecuritiesIndustryMember_07F5FA55F1AF2DEFC2CBFC243F11B8A5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AviationandAerospaceBrokingIndustryMember" xlink:label="loc_aon_AviationandAerospaceBrokingIndustryMember_72A5937DCC1C6C7FD63CFC243F12169E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_07F5FA55F1AF2DEFC2CBFC243F11B8A5" xlink:to="loc_aon_AviationandAerospaceBrokingIndustryMember_72A5937DCC1C6C7FD63CFC243F12169E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_4F4A537B080D27952F5AFC243F121621" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:to="loc_srt_RangeAxis_4F4A537B080D27952F5AFC243F121621" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_49278885ECBEFF808C2FFC243F12447B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_4F4A537B080D27952F5AFC243F121621" xlink:to="loc_srt_RangeMember_49278885ECBEFF808C2FFC243F12447B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_BC28B892924BC7DED7D5FC243F12A72E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_49278885ECBEFF808C2FFC243F12447B" xlink:to="loc_srt_MinimumMember_BC28B892924BC7DED7D5FC243F12A72E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_E469F0652879CC1E4B14FC243F13DA35" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_49278885ECBEFF808C2FFC243F12447B" xlink:to="loc_srt_MaximumMember_E469F0652879CC1E4B14FC243F13DA35" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LitigationStatusAxis" xlink:label="loc_us-gaap_LitigationStatusAxis_76D3B02CBB07BEA5371AFC243F137A14" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:to="loc_us-gaap_LitigationStatusAxis_76D3B02CBB07BEA5371AFC243F137A14" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LitigationStatusDomain" xlink:label="loc_us-gaap_LitigationStatusDomain_6B89544ABEE28683AA2DFC243F139E5C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationStatusAxis_76D3B02CBB07BEA5371AFC243F137A14" xlink:to="loc_us-gaap_LitigationStatusDomain_6B89544ABEE28683AA2DFC243F139E5C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PendingLitigationMember" xlink:label="loc_us-gaap_PendingLitigationMember_A0B7E9C3180E714DDCFDFC243F13C558" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationStatusDomain_6B89544ABEE28683AA2DFC243F139E5C" xlink:to="loc_us-gaap_PendingLitigationMember_A0B7E9C3180E714DDCFDFC243F13C558" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_LitigationCaseAxis" xlink:label="loc_srt_LitigationCaseAxis_24DFEEC41C785F1319E9FC243F149492" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:to="loc_srt_LitigationCaseAxis_24DFEEC41C785F1319E9FC243F149492" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_LitigationCaseTypeDomain" xlink:label="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseAxis_24DFEEC41C785F1319E9FC243F149492" xlink:to="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TrusteesOfGleedsPensionFund2016Member" xlink:label="loc_aon_TrusteesOfGleedsPensionFund2016Member_D7ACD1E1118F9FDCBB4EFC243F14B89D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:to="loc_aon_TrusteesOfGleedsPensionFund2016Member_D7ACD1E1118F9FDCBB4EFC243F14B89D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LyttletonPortCompanyLimitedMember" xlink:label="loc_aon_LyttletonPortCompanyLimitedMember_CB027D93F36A28827A24FC243F156A4A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:to="loc_aon_LyttletonPortCompanyLimitedMember_CB027D93F36A28827A24FC243F156A4A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ChristchurchCityCouncilMember" xlink:label="loc_aon_ChristchurchCityCouncilMember_2B3F2CA73B2360A1E7D4FC243F15F106" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:to="loc_aon_ChristchurchCityCouncilMember_2B3F2CA73B2360A1E7D4FC243F15F106" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_PilkingtonNorthAmericaInc.Member" xlink:label="loc_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:to="loc_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E" xlink:type="arc"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_475D9B8DF68DA3287A7EFC243F141C88" xlink:to="loc_aon_PotentialClaimforPensionAdvisoryServicesMember_8E4F3A56DAF0DFA34EBAFC243F119981" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_402F732DFB4F546CB73EFC243F15F8E2" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_E3344CBD6B467EB8E255FC243F10B8BB" xlink:to="loc_us-gaap_LossContingenciesLineItems_402F732DFB4F546CB73EFC243F15F8E2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_605F0351BA6F521AAB89FC243F158A6C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_402F732DFB4F546CB73EFC243F15F8E2" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_605F0351BA6F521AAB89FC243F158A6C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_402F732DFB4F546CB73EFC243F15F8E2" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyDamagesAwardedValue" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_DC5E21F4004BC321A6BFFC243F1693DA" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_402F732DFB4F546CB73EFC243F15F8E2" xlink:to="loc_us-gaap_LossContingencyDamagesAwardedValue_DC5E21F4004BC321A6BFFC243F1693DA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_402F732DFB4F546CB73EFC243F15F8E2" xlink:to="loc_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesLettersOfCreditNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_1EF9B5B0D917D4C2B50BD7486910E993" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_DAC2A6197D958D4F5B43D748691027E0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_1EF9B5B0D917D4C2B50BD7486910E993" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_DAC2A6197D958D4F5B43D748691027E0" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsAndOtherContingenciesPremiumPaymentsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_6C6611C924072AC060B2D7486C78F268" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_6F08277F9E537C92B509D7486C787604" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_6C6611C924072AC060B2D7486C78F268" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_6F08277F9E537C92B509D7486C787604" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_E6D5B871182F4784D5602080317F48EC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_ProfitLoss_E6D5B871182F4784D5602080317F48EC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_DCF8D83B2AC42F83A88A20803180E97C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_DCF8D83B2AC42F83A88A20803180E97C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_GainLossOnSaleofBusinessAndInvestmentsNet" xlink:label="loc_aon_GainLossOnSaleofBusinessAndInvestmentsNet_E0BF5DA9B545AEA271D02080318050C4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:to="loc_aon_GainLossOnSaleofBusinessAndInvestmentsNet_E0BF5DA9B545AEA271D02080318050C4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_FE2A26BB842020A0F46E208031809782" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:to="loc_us-gaap_Depreciation_FE2A26BB842020A0F46E208031809782" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="loc_us-gaap_AdjustmentForAmortization_4882882307FCAC3639FF20803180AE00" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:to="loc_us-gaap_AdjustmentForAmortization_4882882307FCAC3639FF20803180AE00" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_2FB120C8E1AF310F892B208031814700" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:to="loc_us-gaap_ShareBasedCompensation_2FB120C8E1AF310F892B208031814700" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_E8B776B086A4153F42D420803181D896" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_2078B7287444BCEE73002080318025D7" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_E8B776B086A4153F42D420803181D896" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncreaseDecreaseInFiduciaryReceivables" xlink:label="loc_aon_IncreaseDecreaseInFiduciaryReceivables_2084E70FDE7E0259DECC208031829049" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_aon_IncreaseDecreaseInFiduciaryReceivables_2084E70FDE7E0259DECC208031829049" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInClientFundsHeld" xlink:label="loc_us-gaap_IncreaseDecreaseInClientFundsHeld_5375F23F30F403EA5C44208031822B2E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInClientFundsHeld_5375F23F30F403EA5C44208031822B2E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncreaseDecreaseInFiduciaryLiabilities" xlink:label="loc_aon_IncreaseDecreaseInFiduciaryLiabilities_4B31A28509B70C09084C208031827AE7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_aon_IncreaseDecreaseInFiduciaryLiabilities_4B31A28509B70C09084C208031827AE7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_DB127710E2C01329068420803182B2E3" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_DB127710E2C01329068420803182B2E3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_F679F3C9A58F7CB977312080318319B6" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_F679F3C9A58F7CB977312080318319B6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInRestructuringReserve" xlink:label="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_B2FF6B1BEA4C652027D720803183E384" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_B2FF6B1BEA4C652027D720803183E384" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B643BC9BC79549EF3D702080318338DB" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B643BC9BC79549EF3D702080318338DB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_491DA20692A6E4327BC8208031847CE4" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AA87CE69383644A2ED7B2080318270D9" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_491DA20692A6E4327BC8208031847CE4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_BE6B15BAA1DDFCCAFE4320803184B4D8" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_BE6B15BAA1DDFCCAFE4320803184B4D8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_ACF205AA6DD1ECB0E5FE208031844FCA" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_ACF205AA6DD1ECB0E5FE208031844FCA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_429EC864948F29A57FA0208031846394" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9D17F62291562728C72A2080317FEC5C" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_429EC864948F29A57FA0208031846394" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_667AA822E9EE686671EB208031858DCC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_667AA822E9EE686671EB208031858DCC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireOtherInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireOtherInvestments_A8F0C365869CDD21E3C920803185828A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_PaymentsToAcquireOtherInvestments_A8F0C365869CDD21E3C920803185828A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_PaymentsForProceedsFromMarketableSecurities" xlink:label="loc_aon_PaymentsForProceedsFromMarketableSecurities_5FCC1FDE25A579B72F3C208031853BAE" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_aon_PaymentsForProceedsFromMarketableSecurities_5FCC1FDE25A579B72F3C208031853BAE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_F4F5AFFBB39112080550208031868A97" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_F4F5AFFBB39112080550208031868A97" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_3EE2E915E67F19DF5694208031863C6E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_3EE2E915E67F19DF5694208031863C6E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_018F92C01E3617F2ADEF20803186CED1" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_018F92C01E3617F2ADEF20803186CED1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_CACDAC653C2851F769B8208031879931" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_CACDAC653C2851F769B8208031879931" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_BAB48251CC0C073359D3208031874806" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_BAB48251CC0C073359D3208031874806" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BC24A6A3CFDBD48AB202080318707B6" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1D1D48EA315EF6A9BB5C20803185EC26" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BC24A6A3CFDBD48AB202080318707B6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquity" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_24A74D393C3B1F000E2520803187F768" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_24A74D393C3B1F000E2520803187F768" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_CF0AC5D3049F3DE279C4208031886D08" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_CF0AC5D3049F3DE279C4208031886D08" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_D8AD671898AEE4086396208031887F1C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_D8AD671898AEE4086396208031887F1C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_4600ABDA5489C4B8ECCA20803188FB2A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_4600ABDA5489C4B8ECCA20803188FB2A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_36C6CD98B2FE0B9306D6208031887E2E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_36C6CD98B2FE0B9306D6208031887E2E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_B6192F742590EA92176C20803189C22B" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_B6192F742590EA92176C20803189C22B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_0B26D70480FC84C7536F20803189D997" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_0B26D70480FC84C7536F20803189D997" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_AC1F3AF2EDE153296E3120803189588C" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_AC1F3AF2EDE153296E3120803189588C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6B0F5E825A16B79519CA20803189C880" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_06114D48D04A1757A401208031872484" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6B0F5E825A16B79519CA20803189C880" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_C7E621FB48A9F716C67E20803189E7CA" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_C7E621FB48A9F716C67E20803189E7CA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_FD3BB415BE81C628099E20803189E782" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_FD3BB415BE81C628099E20803189E782" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_82553F827F2762AC0A042080318A1B08" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_82553F827F2762AC0A042080318A1B08" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_54B6FDF89ED4600D7BAD2080318A7CCA" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_54B6FDF89ED4600D7BAD2080318A7CCA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_EEC854740A36A8E052F92080318A4F19" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_28F72823945FD8CAA0612080317F5C65" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_EEC854740A36A8E052F92080318A4F19" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_CE9E434C0DD36D02AAD22080318A0A37" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_EEC854740A36A8E052F92080318A4F19" xlink:to="loc_us-gaap_InterestPaidNet_CE9E434C0DD36D02AAD22080318A0A37" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_889D32DB1442CF3008172080318B95C1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_EEC854740A36A8E052F92080318A4F19" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_889D32DB1442CF3008172080318B95C1" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_A0FE9D8857A3EF608256D7486A04B486" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_ProfitLoss_A0FE9D8857A3EF608256D7486A04B486" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_E00FE7D7BB8499F32DF2D7486A040B54" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_E00FE7D7BB8499F32DF2D7486A040B54" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_525BE345FCAEC89743F9D7486A04DF39" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_525BE345FCAEC89743F9D7486A04DF39" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_330BF05425D81934BE84D7486A045418" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_330BF05425D81934BE84D7486A045418" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_DC4B80DD2BB79C90494BD7486A0414E7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_330BF05425D81934BE84D7486A045418" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_DC4B80DD2BB79C90494BD7486A0414E7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_4F19DFDB26F8AD917E18D7486A0549B7" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_330BF05425D81934BE84D7486A045418" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_4F19DFDB26F8AD917E18D7486A0549B7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_D2EEC771BEE9126912E1D7486A055706" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_330BF05425D81934BE84D7486A045418" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_D2EEC771BEE9126912E1D7486A055706" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_B37A069410B166A01CBDD7486A057A69" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_330BF05425D81934BE84D7486A045418" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_B37A069410B166A01CBDD7486A057A69" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_9400CE663000378925EBD7486A050D81" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_9400CE663000378925EBD7486A050D81" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A4613C7D2CB3D7665BD1D7486A06A437" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A4613C7D2CB3D7665BD1D7486A06A437" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_FD47D6E520F4C10F8C3FD7486A0BBFA7" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_4040822E76789C1837DBD7486A04E31B" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_FD47D6E520F4C10F8C3FD7486A0BBFA7" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfFinancialPosition" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_58FD35C1E73B040B4A132030B78F21B2" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_58FD35C1E73B040B4A132030B78F21B2" xlink:to="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_B2AF5465F65388B6477F2030B7907909" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_B2AF5465F65388B6477F2030B7907909" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_F15F59882E8145D9FBB22030B7911290" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:to="loc_us-gaap_ShortTermInvestments_F15F59882E8145D9FBB22030B7911290" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_0F6B15D302E4B5B28CD02030B7912CD5" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_0F6B15D302E4B5B28CD02030B7912CD5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryAssets" xlink:label="loc_aon_FiduciaryAssets_A56FEB2C11B4DF10CDCF2030B791EBE1" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:to="loc_aon_FiduciaryAssets_A56FEB2C11B4DF10CDCF2030B791EBE1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_82C80CE7262E0D2F227A2030B7917C40" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:to="loc_us-gaap_OtherAssetsCurrent_82C80CE7262E0D2F227A2030B7917C40" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_9A7ED565A9BE5199C4DA2030B792B461" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_0CC02FC2D1D6262008A02030B7902DA4" xlink:to="loc_us-gaap_AssetsCurrent_9A7ED565A9BE5199C4DA2030B792B461" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_941B963B2D0A7DCBE4302030B792BBB5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_Goodwill_941B963B2D0A7DCBE4302030B792BBB5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_CE8223DADB0E83044BDB2030B792BF6E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_CE8223DADB0E83044BDB2030B792BF6E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_6CD68F074F13ABBDE08D2030B7921B39" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_6CD68F074F13ABBDE08D2030B7921B39" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_B2DE29CD224A05BFC7B22030B793078A" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_B2DE29CD224A05BFC7B22030B793078A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_298897AE1E8CA59951C82030B7937131" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_298897AE1E8CA59951C82030B7937131" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_B552070BE99C8636D5372030B7930132" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_B552070BE99C8636D5372030B7930132" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_DC706807CF70A7EF93792030B793CBF3" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_DC706807CF70A7EF93792030B793CBF3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_3DA0E2818A04374984E02030B793649E" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_ACF0C8FA009081D122AA2030B78F7A47" xlink:to="loc_us-gaap_Assets_3DA0E2818A04374984E02030B793649E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_847DA9C0FE50CA1E632D2030B794C6A4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_58FD35C1E73B040B4A132030B78F21B2" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_847DA9C0FE50CA1E632D2030B794C6A4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_847DA9C0FE50CA1E632D2030B794C6A4" xlink:to="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6F771F7B5B12B2B547092030B7957A3C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6F771F7B5B12B2B547092030B7957A3C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_8AEF99B5744EA155B5072030B79506AA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:to="loc_us-gaap_DebtCurrent_8AEF99B5744EA155B5072030B79506AA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryLiabilities" xlink:label="loc_aon_FiduciaryLiabilities_C3C420B1DFC36D35ADCE2030B795AAC9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:to="loc_aon_FiduciaryLiabilities_C3C420B1DFC36D35ADCE2030B795AAC9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_35C2474F12B6670BB6922030B7953399" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_35C2474F12B6670BB6922030B7953399" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_734ECF1528966EF529182030B7966177" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1C0B9987B0D258E634402030B7949E24" xlink:to="loc_us-gaap_LiabilitiesCurrent_734ECF1528966EF529182030B7966177" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_88ECEEC6F78CE10243F22030B79B981F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_88ECEEC6F78CE10243F22030B79B981F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_1923E19C7530CA1C5CC12030B79CCB1C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_1923E19C7530CA1C5CC12030B79CCB1C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_23A7728F2FB3D3B4D4422030B79CD500" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_23A7728F2FB3D3B4D4422030B79CD500" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent_3961A7A37553E6F6802C2030B79C08FA" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent_3961A7A37553E6F6802C2030B79C08FA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_E13BDF4D6FEC924C711F2030B79CCEC9" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_E13BDF4D6FEC924C711F2030B79CCEC9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_3B347950F6658519ABE02030B79C1C2C" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9F275EB11913189E17962030B794BEBB" xlink:to="loc_us-gaap_Liabilities_3B347950F6658519ABE02030B79C1C2C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_847DA9C0FE50CA1E632D2030B794C6A4" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_C9F05DA6D9D7BAEB18C32030B79D3589" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_CommonStockValue_C9F05DA6D9D7BAEB18C32030B79D3589" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9768DF078DB1BCC917302030B79DCDEB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9768DF078DB1BCC917302030B79DCDEB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_3AB6191AE03C042788C62030B79E6EFE" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_3AB6191AE03C042788C62030B79E6EFE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_B6848E4BA96B1157FE632030B79E9704" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_B6848E4BA96B1157FE632030B79E9704" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_8209933B913EDB59FE472030B79E1163" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_StockholdersEquity_8209933B913EDB59FE472030B79E1163" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_8FB2048D6247AD1841662030B79E4D16" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_MinorityInterest_8FB2048D6247AD1841662030B79E4D16" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_372C90F121548288603B2030B79E682C" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2A353C5D9B1E4B1EA10D2030B79D2598" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_372C90F121548288603B2030B79E682C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_AE631856B74C300AE8B42030B79F7354" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_847DA9C0FE50CA1E632D2030B794C6A4" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_AE631856B74C300AE8B42030B79F7354" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfFinancialPositionParenthetical" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_1CBFF1F32DE8E17AE292F6E34165652D" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_BD4F1CB8F2B308ADEC34F6E341655D7F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_1CBFF1F32DE8E17AE292F6E34165652D" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_BD4F1CB8F2B308ADEC34F6E341655D7F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_AF8DD7CBA175D7E58EC4F6E341653D27" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_1CBFF1F32DE8E17AE292F6E34165652D" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_AF8DD7CBA175D7E58EC4F6E341653D27" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_34C95B38D8D6DE27607DF6E341656FB9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_1CBFF1F32DE8E17AE292F6E34165652D" xlink:to="loc_us-gaap_CommonStockSharesIssued_34C95B38D8D6DE27607DF6E341656FB9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfIncome" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_7D92172ECA87DF7832462030B7DB4B8F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_RevenuesAbstract_7D92172ECA87DF7832462030B7DB4B8F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0A589BE7D44CB7354C162030B7DC3C55" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_7D92172ECA87DF7832462030B7DB4B8F" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0A589BE7D44CB7354C162030B7DC3C55" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_5A0FBBE643508EF24EE52030B7DD3947" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_us-gaap_LaborAndRelatedExpense_5A0FBBE643508EF24EE52030B7DD3947" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InformationTechnologyAndDataProcessing" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_B7A75EBD33D91ED7A8102030B7DDEE72" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_B7A75EBD33D91ED7A8102030B7DDEE72" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_us-gaap_OccupancyNet_FB20A271CACD0E5E65392030B7DD420D" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_us-gaap_OccupancyNet_FB20A271CACD0E5E65392030B7DD420D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_2DE80D024C00638DA2522046873CC9E3" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_us-gaap_Depreciation_2DE80D024C00638DA2522046873CC9E3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssets" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_5A37F3F5DA399F22AFD02030B7DDB580" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_5A37F3F5DA399F22AFD02030B7DDB580" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherGeneralExpenses" xlink:label="loc_aon_OtherGeneralExpenses_05A4D8A003E7A4A53BEC2030B7DE5F5C" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_aon_OtherGeneralExpenses_05A4D8A003E7A4A53BEC2030B7DE5F5C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_1E5B8E8207A96011BC072030B7DE5ED4" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_87D433F26B71C5283A142030B7DCF164" xlink:to="loc_us-gaap_CostsAndExpenses_1E5B8E8207A96011BC072030B7DE5ED4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_BDB83D4AEB0D4A2DBD242030B7DE16C2" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_OperatingIncomeLoss_BDB83D4AEB0D4A2DBD242030B7DE16C2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_E1A0342E84973621D1D62030B7DF22C0" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_E1A0342E84973621D1D62030B7DF22C0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_EB3C5967B8836AF1B6872030B7DF4FBC" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_InterestExpense_EB3C5967B8836AF1B6872030B7DF4FBC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_23AC98D6D4551220D2EE2030B7DF8C8A" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_23AC98D6D4551220D2EE2030B7DF8C8A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_B3506EE48D9584298EA42030B7DFA77F" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_B3506EE48D9584298EA42030B7DFA77F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_3EFF2BE51C6DD170A9FF2030B7DFBC84" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_3EFF2BE51C6DD170A9FF2030B7DFBC84" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_C0BE7E7E370F299AEA492030B7E05670" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_C0BE7E7E370F299AEA492030B7E05670" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_6EAC674C78A42CCC7DC92030B7E0098A" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_6EAC674C78A42CCC7DC92030B7E0098A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_02940C07083CAC1B2FF52030B7E0CD1C" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_ProfitLoss_02940C07083CAC1B2FF52030B7E0CD1C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_56BB2F1F45B984BA63F52030B7E0967E" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_56BB2F1F45B984BA63F52030B7E0967E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_53B8DCEFEE55F534E5062030B7E1F32F" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_53B8DCEFEE55F534E5062030B7E1F32F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_408225376CA84D00ECFC2030B7E13E0D" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_408225376CA84D00ECFC2030B7E13E0D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_74F79AB5579E827040432030B7E1D379" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_408225376CA84D00ECFC2030B7E13E0D" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_74F79AB5579E827040432030B7E1D379" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_389D83E702BE727FD7F92030B7E163D2" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_408225376CA84D00ECFC2030B7E13E0D" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_389D83E702BE727FD7F92030B7E163D2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_B78E11262144104466E02030B7E2CA34" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_408225376CA84D00ECFC2030B7E13E0D" xlink:to="loc_us-gaap_EarningsPerShareBasic_B78E11262144104466E02030B7E2CA34" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_F96A986ECE1C3AF93EA52030B7E2EE69" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_F96A986ECE1C3AF93EA52030B7E2EE69" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_DE6EF029B5E499304ED52030B7E2E72D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_F96A986ECE1C3AF93EA52030B7E2EE69" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_DE6EF029B5E499304ED52030B7E2E72D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_5814E76347A0B6B93E7E2030B7E2804D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_F96A986ECE1C3AF93EA52030B7E2EE69" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_5814E76347A0B6B93E7E2030B7E2804D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_ACCE22F00146614235212030B7E2C1B6" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_F96A986ECE1C3AF93EA52030B7E2EE69" xlink:to="loc_us-gaap_EarningsPerShareDiluted_ACCE22F00146614235212030B7E2C1B6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_877A70E32F05EB7EB4312030B7E84BB7" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_877A70E32F05EB7EB4312030B7E84BB7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3E7F42D4242DBBE55B862030B7E8EF85" xlink:type="locator"/>
<link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_E90083E71CD39D44883F2030B7DB29E2" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3E7F42D4242DBBE55B862030B7E8EF85" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_CCD277793E59D43B0CE6F6E3415A737A" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_963786E27FF8771ABE86F6E3415A65B4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_CCD277793E59D43B0CE6F6E3415A737A" xlink:to="loc_us-gaap_StatementTable_963786E27FF8771ABE86F6E3415A65B4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_E06054176B6E9DF82A46F6E3415A9835" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_963786E27FF8771ABE86F6E3415A65B4" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_E06054176B6E9DF82A46F6E3415A9835" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_14CE31FFE0A34379B174F6E3415BED6A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_E06054176B6E9DF82A46F6E3415A9835" xlink:to="loc_us-gaap_EquityComponentDomain_14CE31FFE0A34379B174F6E3415BED6A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_6CE3E5EB959316F04B5BF6E3415BBF0A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_14CE31FFE0A34379B174F6E3415BED6A" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_6CE3E5EB959316F04B5BF6E3415BBF0A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_352D8D01ADA92C80E70BF6E3415BE33F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_14CE31FFE0A34379B174F6E3415BED6A" xlink:to="loc_us-gaap_RetainedEarningsMember_352D8D01ADA92C80E70BF6E3415BE33F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6921E454B8B7A72F7D3CF6E3415BE14B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_14CE31FFE0A34379B174F6E3415BED6A" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6921E454B8B7A72F7D3CF6E3415BE14B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_35C3F8246F7443AF37FFF6E3415CDC03" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_14CE31FFE0A34379B174F6E3415BED6A" xlink:to="loc_us-gaap_NoncontrollingInterestMember_35C3F8246F7443AF37FFF6E3415CDC03" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_AACCDFF40306F4F7D4C3F6E3415CCAC0" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_963786E27FF8771ABE86F6E3415A65B4" xlink:to="loc_us-gaap_StatementLineItems_AACCDFF40306F4F7D4C3F6E3415CCAC0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_AACCDFF40306F4F7D4C3F6E3415CCAC0" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_B9B3F666E438389D8DBFF6E3415C62BA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_CommonStockSharesIssued_B9B3F666E438389D8DBFF6E3415C62BA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_750B093FBD83534F3D9FF6E3415DC91A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_750B093FBD83534F3D9FF6E3415DC91A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_BF528C4A85EB2D895D75F6E3415FE4DA" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_BF528C4A85EB2D895D75F6E3415FE4DA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1_A9D291E28321E675788CF6F75A69AC50" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1_A9D291E28321E675788CF6F75A69AC50" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_9CDE90AF06B99DC3AE8EF6E3415DC9A8" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_ProfitLoss_9CDE90AF06B99DC3AE8EF6E3415DC9A8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_5AC84C2ABEFA2B2C4982F6E3415D3569" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_5AC84C2ABEFA2B2C4982F6E3415D3569" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_DCF6358D93354D26D7BDF6E3415D20F3" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_DCF6358D93354D26D7BDF6E3415D20F3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_4937A6CDD145223353C2F6FC97D133A3" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_4937A6CDD145223353C2F6FC97D133A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_7084DCDEA907B54BFA60F6FCC7A1A9EF" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_7084DCDEA907B54BFA60F6FCC7A1A9EF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_799AF95F66639CCCC927F6E3415D6A4F" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_799AF95F66639CCCC927F6E3415D6A4F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_BD7EEC6A0F4D76D2EFD7F6E3415FFE39" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_DividendsCommonStockCash_BD7EEC6A0F4D76D2EFD7F6E3415FFE39" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_11A67CB0C6FD9DC5F947F6E3415F8485" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_11A67CB0C6FD9DC5F947F6E3415F8485" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_4C6CC4C36FF4E3910C36F6E3415F7D10" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_4C6CC4C36FF4E3910C36F6E3415F7D10" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_C8280F304E697DCF77D2F6E3415F8BBC" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_C8280F304E697DCF77D2F6E3415F8BBC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_48F734DDC6D1CDA3B726F6E34160254F" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_48F734DDC6D1CDA3B726F6E34160254F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_7FBB91F105661C50C3D6F6E34160A0C6" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_7FBB91F105661C50C3D6F6E34160A0C6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_DF5C6ABF6EE7DF8002FCF6E341606057" xlink:type="locator"/>
<link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_CommonStockSharesIssued_DF5C6ABF6EE7DF8002FCF6E341606057" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_D647C3009CF8D82B7FC0F6E3416098B9" xlink:type="locator"/>
<link:presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_23CA8F7E8E98EFE2B5BDF6E3415C179A" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_D647C3009CF8D82B7FC0F6E3416098B9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsOfShareholdersEquityParenthetical" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_C69C10AAE10DEA21948AFC2F7C85AA48" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_0B573786141C34750ECFFC2F7C854E5A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_C69C10AAE10DEA21948AFC2F7C85AA48" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_0B573786141C34750ECFFC2F7C854E5A" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/Cover" xlink:type="extended">
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CoverAbstract" xlink:label="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_3A73D0BDA82851196B7E021EFA41504D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentType_3A73D0BDA82851196B7E021EFA41504D" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentAnnualReport" xlink:label="loc_dei_DocumentAnnualReport_16AEAE38C0BC32D47324021EFA4262CD" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentAnnualReport_16AEAE38C0BC32D47324021EFA4262CD" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_496212CCD30A8E17F121021EFA423571" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentPeriodEndDate_496212CCD30A8E17F121021EFA423571" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentTransitionReport" xlink:label="loc_dei_DocumentTransitionReport_3B5C58D51F729504B963021EFA42788A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentTransitionReport_3B5C58D51F729504B963021EFA42788A" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_6D607DE8C3D67CFD99EA021EFA42F524" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityFileNumber_6D607DE8C3D67CFD99EA021EFA42F524" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_7E96642198A5CC0C6D86021EFA422340" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityRegistrantName_7E96642198A5CC0C6D86021EFA422340" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_7B1049ED764046BD89FC021EFA4263FC" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityIncorporationStateCountryCode_7B1049ED764046BD89FC021EFA4263FC" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_dei_EntityTaxIdentificationNumber_D529D846F4FF18BA4068021EFA43E256" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityTaxIdentificationNumber_D529D846F4FF18BA4068021EFA43E256" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_398696F5CFB5161EB2A7021EFA43AB72" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityAddressAddressLine1_398696F5CFB5161EB2A7021EFA43AB72" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_E9AC426775F1447D4535021EFA432EDE" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityAddressCityOrTown_E9AC426775F1447D4535021EFA432EDE" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCountry" xlink:label="loc_dei_EntityAddressCountry_7DD7FED75C290BF1850A021EFA43592F" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityAddressCountry_7DD7FED75C290BF1850A021EFA43592F" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_E9FC3982458EF66BE531021EFA435B53" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityAddressPostalZipCode_E9FC3982458EF66BE531021EFA435B53" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_E912FDEFB4BC6C922FBA021EFA448F31" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_CityAreaCode_E912FDEFB4BC6C922FBA021EFA448F31" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_A950FA48F0D5212677F1021EFA440D04" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_LocalPhoneNumber_A950FA48F0D5212677F1021EFA440D04" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_F88410A94F88883665B1021EFA493E7C" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_Security12bTitle_F88410A94F88883665B1021EFA493E7C" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_C7ADEEC4E42CC388A1F7021EFA495894" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_TradingSymbol_C7ADEEC4E42CC388A1F7021EFA495894" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_EAF449B488C01A747BAC021EFA49CB92" xlink:type="locator"/>
<link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_SecurityExchangeName_EAF449B488C01A747BAC021EFA49CB92" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_866AC47AE858EFD6FC3C021EFA4A00F5" xlink:type="locator"/>
<link:presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_866AC47AE858EFD6FC3C021EFA4A00F5" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_0F4A35254D1FE2855A86021EFA4ACC09" xlink:type="locator"/>
<link:presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityVoluntaryFilers_0F4A35254D1FE2855A86021EFA4ACC09" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_952E6BFCDE66E8130F71021EFA4A1006" xlink:type="locator"/>
<link:presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityCurrentReportingStatus_952E6BFCDE66E8130F71021EFA4A1006" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_C9619180F3F6D1627E29021EFA4A4067" xlink:type="locator"/>
<link:presentationArc order="21" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityInteractiveDataCurrent_C9619180F3F6D1627E29021EFA4A4067" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_058963854378ABDCD5CB021EFA4A4D69" xlink:type="locator"/>
<link:presentationArc order="22" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityFilerCategory_058963854378ABDCD5CB021EFA4A4D69" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_22C6AAF780F288E2D046021EFA4A3845" xlink:type="locator"/>
<link:presentationArc order="23" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntitySmallBusiness_22C6AAF780F288E2D046021EFA4A3845" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_799CA934FA5E1A2DC02F021EFA4B5173" xlink:type="locator"/>
<link:presentationArc order="24" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityEmergingGrowthCompany_799CA934FA5E1A2DC02F021EFA4B5173" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_C1ECE65939F83B945B10021EFA4B6AC7" xlink:type="locator"/>
<link:presentationArc order="25" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityShellCompany_C1ECE65939F83B945B10021EFA4B6AC7" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_127D87979442EF5E1BED021EFA4B4256" xlink:type="locator"/>
<link:presentationArc order="26" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityPublicFloat_127D87979442EF5E1BED021EFA4B4256" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_D6889352FA8268DEBCC6021EFA4B0E4E" xlink:type="locator"/>
<link:presentationArc order="27" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_D6889352FA8268DEBCC6021EFA4B0E4E" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentsIncorporatedByReferenceTextBlock" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock_5F880E9FD85B1F931ECF021EFA4B13C8" xlink:type="locator"/>
<link:presentationArc order="28" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentsIncorporatedByReferenceTextBlock_5F880E9FD85B1F931ECF021EFA4B13C8" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_933668507A8684C25189021EFA4B6215" xlink:type="locator"/>
<link:presentationArc order="29" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_EntityCentralIndexKey_933668507A8684C25189021EFA4B6215" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_560F9BD1D16CB07D1A2C021EFA4C6227" xlink:type="locator"/>
<link:presentationArc order="30" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_AmendmentFlag_560F9BD1D16CB07D1A2C021EFA4C6227" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_71E2703F8DB8FB68FF45021EFA4C978B" xlink:type="locator"/>
<link:presentationArc order="31" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_CurrentFiscalYearEndDate_71E2703F8DB8FB68FF45021EFA4C978B" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_4584FE660F60C3886249021EFA4C9DF3" xlink:type="locator"/>
<link:presentationArc order="32" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentFiscalYearFocus_4584FE660F60C3886249021EFA4C9DF3" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_3486948B7DB84929A12C021EFA4CD90A" xlink:type="locator"/>
<link:presentationArc order="33" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_10A82F47F3D52CBB90A2021EFA4127D8" xlink:to="loc_dei_DocumentFiscalPeriodFocus_3486948B7DB84929A12C021EFA4CD90A" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/Debt" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_7F1DA5422CC875A85FB6D74869C9858D" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_383D40830666CEF95FB9D74869C97C9B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_7F1DA5422CC875A85FB6D74869C9858D" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_383D40830666CEF95FB9D74869C97C9B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DebtNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_C4EADEDFD080D66E1B671B28E8603709" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_C4EADEDFD080D66E1B671B28E8603709" xlink:to="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_1A7C3E4C66392D0E1C021B28E8618036" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:to="loc_srt_StatementGeographicalAxis_1A7C3E4C66392D0E1C021B28E8618036" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_FF3754B25C34F389CA951B28E8618F67" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_1A7C3E4C66392D0E1C021B28E8618036" xlink:to="loc_srt_SegmentGeographicalDomain_FF3754B25C34F389CA951B28E8618F67" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_C95E4E305F0CD3267D371B28E8623CA1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_FF3754B25C34F389CA951B28E8618F67" xlink:to="loc_country_US_C95E4E305F0CD3267D371B28E8623CA1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_EuropeMember" xlink:label="loc_srt_EuropeMember_D66F124CF13F63B75A131B28E862FFAB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_FF3754B25C34F389CA951B28E8618F67" xlink:to="loc_srt_EuropeMember_D66F124CF13F63B75A131B28E862FFAB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_A52842B267DE530998351B28E862E761" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_A52842B267DE530998351B28E862E761" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_BD408FE2131D1D3B59861B28E862024C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_A52842B267DE530998351B28E862E761" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_BD408FE2131D1D3B59861B28E862024C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_DC7899807A5EC80C4B961B28E8629F33" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_BD408FE2131D1D3B59861B28E862024C" xlink:to="loc_us-gaap_CommercialPaperMember_DC7899807A5EC80C4B961B28E8629F33" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:to="loc_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28" xlink:to="loc_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CreditFacilityExpiringFebruary2022Member" xlink:label="loc_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:to="loc_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CreditFacilityExpiringOctober2023Member" xlink:label="loc_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:to="loc_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:to="loc_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:to="loc_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:to="loc_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2.20SeniorNotesdueNovember2022Member" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:to="loc_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A5.00SeniorNotesDueSeptember2020Member" xlink:label="loc_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:to="loc_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.75SeniorNotesDueMay22029Member" xlink:label="loc_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:to="loc_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.50SeniorNotesDueDecember2028Member" xlink:label="loc_aon_A4.50SeniorNotesDueDecember2028Member_CA2E25FE80EC019BA2101B28E86722A6" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:to="loc_aon_A4.50SeniorNotesDueDecember2028Member_CA2E25FE80EC019BA2101B28E86722A6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_ABFBA4AA632531D81DF21B28E8612853" xlink:to="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_ED5763E621E821370FFE1B28E868316D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_ED5763E621E821370FFE1B28E868316D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E09319912B0F32ABA24B1B28E868025E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E09319912B0F32ABA24B1B28E868025E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_D492515FB43DB77BA42B1B28E868CA04" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_us-gaap_DebtCurrent_D492515FB43DB77BA42B1B28E868CA04" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DebtNumberOfCommittedCreditFacilities" xlink:label="loc_aon_DebtNumberOfCommittedCreditFacilities_D474E39075830E1CE6F11B28E869584F" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_aon_DebtNumberOfCommittedCreditFacilities_D474E39075830E1CE6F11B28E869584F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D194B4DE0FAE1F41C6071B28E8698A2A" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D194B4DE0FAE1F41C6071B28E8698A2A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_756BA5F942C19E53C1041B28E869C0B8" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_us-gaap_LineOfCredit_756BA5F942C19E53C1041B28E869C0B8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_5D146FE42C2F0A9B20CA1B28E869980D" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_D009C5ABBC36DCED32191B28E8686116" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_5D146FE42C2F0A9B20CA1B28E869980D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DebtRepaymentsOfLongTermDebtDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_0916F607FF4611EC1D73F09D53D5334F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_0916F607FF4611EC1D73F09D53D5334F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_18761088A50C46E32F6CF09D53D5F1E2" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_18761088A50C46E32F6CF09D53D5F1E2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_388496F3E8D06ABE38B9F09D53D5384B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_388496F3E8D06ABE38B9F09D53D5384B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_E0E0899D7DF0BBE697E0F09D53D63BDE" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_E0E0899D7DF0BBE697E0F09D53D63BDE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_935AA8A17F7922817613F09D53D68DB2" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_935AA8A17F7922817613F09D53D68DB2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_5A9FB04267BAB0BA542FF09D53D6415D" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_5A9FB04267BAB0BA542FF09D53D6415D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_7C682C7D71BD859E9689F09D53D64830" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_7C682C7D71BD859E9689F09D53D64830" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_Noncashpaymentoflongtermdebtnet" xlink:label="loc_aon_Noncashpaymentoflongtermdebtnet_3224441689DA537A7E40F09D53D61CF8" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_aon_Noncashpaymentoflongtermdebtnet_3224441689DA537A7E40F09D53D61CF8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_2E3C7B9B7AFE44643A2FF09D53D603D1" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B10B2976D00A34ED0353F09D53D577C2" xlink:to="loc_us-gaap_LongTermDebt_2E3C7B9B7AFE44643A2FF09D53D603D1" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DebtScheduleOfCommercialPaperDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_FAB3803E003BC8BBF9F51648BA134072" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_99AC92CC1A3C7C3B55511648BA138FE5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_FAB3803E003BC8BBF9F51648BA134072" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_99AC92CC1A3C7C3B55511648BA138FE5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_DAE84B6A46D3624B162E1648BA13449E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_99AC92CC1A3C7C3B55511648BA138FE5" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_DAE84B6A46D3624B162E1648BA13449E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_84B7338065EF41C365C91648BA13A3C9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_DAE84B6A46D3624B162E1648BA13449E" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_84B7338065EF41C365C91648BA13A3C9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_038BAC91246D008935371648BA13378A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_84B7338065EF41C365C91648BA13A3C9" xlink:to="loc_us-gaap_CommercialPaperMember_038BAC91246D008935371648BA13378A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_80A181C43656C3DA736B1648BA13E3F1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_99AC92CC1A3C7C3B55511648BA138FE5" xlink:to="loc_us-gaap_LineOfCreditFacilityLineItems_80A181C43656C3DA736B1648BA13E3F1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_B8D1D4AD38E87080558A1648BA135197" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_80A181C43656C3DA736B1648BA13E3F1" xlink:to="loc_us-gaap_ShortTermBorrowings_B8D1D4AD38E87080558A1648BA135197" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShorttermDebtAverageOutstandingAmount" xlink:label="loc_us-gaap_ShorttermDebtAverageOutstandingAmount_5E5111930B22AAF460351648BA133E82" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_80A181C43656C3DA736B1648BA13E3F1" xlink:to="loc_us-gaap_ShorttermDebtAverageOutstandingAmount_5E5111930B22AAF460351648BA133E82" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate" xlink:label="loc_aon_ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate_F79E13B7B9224E5E4CFE1648BA13CFC9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_80A181C43656C3DA736B1648BA13E3F1" xlink:to="loc_aon_ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate_F79E13B7B9224E5E4CFE1648BA13CFC9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DebtSummaryOfOutstandingDebtDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_38B4458CFAB794E71D3C1BD336C2DAFF" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_FD379BA53AC89B9CA4001BD336C2E13D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_38B4458CFAB794E71D3C1BD336C2DAFF" xlink:to="loc_us-gaap_DebtInstrumentTable_FD379BA53AC89B9CA4001BD336C2E13D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_242D3992AE0050FB4ED71BD336C3F966" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_FD379BA53AC89B9CA4001BD336C2E13D" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_242D3992AE0050FB4ED71BD336C3F966" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_0793B88E130BA08DF27D1BD336C3BC6B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_242D3992AE0050FB4ED71BD336C3F966" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_0793B88E130BA08DF27D1BD336C3BC6B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_002CAD3B9A3CD8C5CF631BD336C3683C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_0793B88E130BA08DF27D1BD336C3BC6B" xlink:to="loc_us-gaap_CommercialPaperMember_002CAD3B9A3CD8C5CF631BD336C3683C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_4E30DD02F5C84787C9D11BD336C36334" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_FD379BA53AC89B9CA4001BD336C2E13D" xlink:to="loc_us-gaap_DebtInstrumentAxis_4E30DD02F5C84787C9D11BD336C36334" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_4E30DD02F5C84787C9D11BD336C36334" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A5.00SeniorNotesDueSeptember2020Member" xlink:label="loc_aon_A5.00SeniorNotesDueSeptember2020Member_E03A056F57A5B067A23B1BD336C41CB8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A5.00SeniorNotesDueSeptember2020Member_E03A056F57A5B067A23B1BD336C41CB8" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember" xlink:label="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2.20SeniorNotesdueNovember2022Member" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.00SeniorNotesDueNovember2023Member" xlink:label="loc_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.50NotesdueJune2024Member" xlink:label="loc_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.875SeniorNotesdueDecember2025Member" xlink:label="loc_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2.875notesdue2026Member" xlink:label="loc_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member" xlink:label="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.50SeniorNotesDueDecember2028Member" xlink:label="loc_aon_A4.50SeniorNotesDueDecember2028Member_626624974ECF52BBA2161BD336C6602B" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A4.50SeniorNotesDueDecember2028Member_626624974ECF52BBA2161BD336C6602B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.75SeniorNotesDueMay22029Member" xlink:label="loc_aon_A3.75SeniorNotesDueMay22029Member_9803E2A95D2587A943811BD336C6E8EC" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A3.75SeniorNotesDueMay22029Member_9803E2A95D2587A943811BD336C6E8EC" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SeniorNotes625PercentDue2040Member" xlink:label="loc_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SeniorNotes4.25PercentDue2042Member" xlink:label="loc_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NotesDueat2043at4.45PercentMember" xlink:label="loc_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.60SeniorNotesDueJune2044Member" xlink:label="loc_aon_A4.60SeniorNotesDueJune2044Member_47DB7A236D4805BCFDC71BD336C7CA00" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_A4.60SeniorNotesDueJune2044Member_47DB7A236D4805BCFDC71BD336C7CA00" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember" xlink:label="loc_aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember_60A7EDC59796C7ECA1901BD336C75F50" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ACDEC7C74175208B38C41BD336C4F0DE" xlink:to="loc_aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember_60A7EDC59796C7ECA1901BD336C75F50" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_B3EB543ADC59654B768E1BD336C72C69" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_FD379BA53AC89B9CA4001BD336C2E13D" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_B3EB543ADC59654B768E1BD336C72C69" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_576391D2B773EBC75F5D1BD336C77B6E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B3EB543ADC59654B768E1BD336C72C69" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_576391D2B773EBC75F5D1BD336C77B6E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_7FE21A2B1B3F9C1158CE1BD336C71A6B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_576391D2B773EBC75F5D1BD336C77B6E" xlink:to="loc_us-gaap_SeniorNotesMember_7FE21A2B1B3F9C1158CE1BD336C71A6B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NotesPayableOtherPayablesMember" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_D7F1DE98F2E3CCFDB0F51BD336C870A2" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_576391D2B773EBC75F5D1BD336C77B6E" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_D7F1DE98F2E3CCFDB0F51BD336C870A2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_FD379BA53AC89B9CA4001BD336C2E13D" xlink:to="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_0AB938093C4ED9957EF61BD336C85E10" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_0AB938093C4ED9957EF61BD336C85E10" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_B95F02C165CBF19F97B81BD336C88352" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:to="loc_us-gaap_DebtCurrent_B95F02C165CBF19F97B81BD336C88352" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_89AEE76479FB4E3EA7E51BD336C9DBE1" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_89AEE76479FB4E3EA7E51BD336C9DBE1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0FF027C30FCBF97C4E021BD336C96A4E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0FF027C30FCBF97C4E021BD336C96A4E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_70B19D68EDD20AC80FAF1BD336C969BB" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_DAF3D77B7B2F466DEED41BD336C8CA85" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_70B19D68EDD20AC80FAF1BD336C969BB" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DebtTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_BE55A99E8006984AE1FCD7486B06E13F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDebtTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtTableTextBlock_C3EC0D2A58C33EC0ED64D7486B067816" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_BE55A99E8006984AE1FCD7486B06E13F" xlink:to="loc_us-gaap_ScheduleOfDebtTableTextBlock_C3EC0D2A58C33EC0ED64D7486B067816" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_839199C6F358EC112491D7486B07A504" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_BE55A99E8006984AE1FCD7486B06E13F" xlink:to="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_839199C6F358EC112491D7486B07A504" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_D9D524EB3B68CDE712CED7486B07C04B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_BE55A99E8006984AE1FCD7486B06E13F" xlink:to="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_D9D524EB3B68CDE712CED7486B07C04B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DerivativesAndHedging" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3C25C11D5E02794951AED7486883823C" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_C4412CE0D08D6DEEEA20D74868833885" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3C25C11D5E02794951AED7486883823C" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_C4412CE0D08D6DEEEA20D74868833885" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DerivativesAndHedgingNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3CEA202BC948AAFA0E051648B78A4BFB" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_68232B39F0FEABF233071648B78A983B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_3CEA202BC948AAFA0E051648B78A4BFB" xlink:to="loc_us-gaap_DerivativeTable_68232B39F0FEABF233071648B78A983B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_E7D89BDF5D2939BE08961648B78A7EC9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_68232B39F0FEABF233071648B78A983B" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_E7D89BDF5D2939BE08961648B78A7EC9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_03CAD5BC5E32828E59E01648B78ABD65" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_E7D89BDF5D2939BE08961648B78A7EC9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_03CAD5BC5E32828E59E01648B78ABD65" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_D0998F555EACFC75377C1648B78B0515" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingRelationshipDomain_03CAD5BC5E32828E59E01648B78ABD65" xlink:to="loc_us-gaap_CashFlowHedgingMember_D0998F555EACFC75377C1648B78B0515" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetInvestmentHedgingMember" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_EA71D05FC5110F7013E71648B78BB02C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingRelationshipDomain_03CAD5BC5E32828E59E01648B78ABD65" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_EA71D05FC5110F7013E71648B78BB02C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_AE5F25857008E3ADB24D1648B78B60EE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_68232B39F0FEABF233071648B78A983B" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_AE5F25857008E3ADB24D1648B78B60EE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9C352E61AF0920009AD21648B78B6144" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_AE5F25857008E3ADB24D1648B78B60EE" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9C352E61AF0920009AD21648B78B6144" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_859E02C90E893E316B7D1648B78BF817" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_9C352E61AF0920009AD21648B78B6144" xlink:to="loc_us-gaap_ForeignExchangeContractMember_859E02C90E893E316B7D1648B78BF817" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_88E827CB71A78C05DF951648B78CB2C9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_68232B39F0FEABF233071648B78A983B" xlink:to="loc_us-gaap_HedgingDesignationAxis_88E827CB71A78C05DF951648B78CB2C9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_FFCBF1DA67043F928E8F1648B791D11A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationAxis_88E827CB71A78C05DF951648B78CB2C9" xlink:to="loc_us-gaap_HedgingDesignationDomain_FFCBF1DA67043F928E8F1648B791D11A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_CC4C21B1EE6EE48C95B91648B7916947" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationDomain_FFCBF1DA67043F928E8F1648B791D11A" xlink:to="loc_us-gaap_NondesignatedMember_CC4C21B1EE6EE48C95B91648B7916947" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_68232B39F0FEABF233071648B78A983B" xlink:to="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_MaximumAverageMaturityOfForeignCurrencyDerivatives" xlink:label="loc_aon_MaximumAverageMaturityOfForeignCurrencyDerivatives_090DFA31E42C0CB12AEC1648B792FD47" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_aon_MaximumAverageMaturityOfForeignCurrencyDerivatives_090DFA31E42C0CB12AEC1648B792FD47" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTermOfContract" xlink:label="loc_us-gaap_DerivativeTermOfContract_D74FF4AA96595E7F2A611648B7920F8A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_us-gaap_DerivativeTermOfContract_D74FF4AA96595E7F2A611648B7920F8A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_MaximumLengthOfTimeHedgedInForeignCurrencyUndesignatedHedge" xlink:label="loc_aon_MaximumLengthOfTimeHedgedInForeignCurrencyUndesignatedHedge_EBD7D5C00910B114C7D01648B792D8B0" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_aon_MaximumLengthOfTimeHedgedInForeignCurrencyUndesignatedHedge_EBD7D5C00910B114C7D01648B792D8B0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_5C27A38C6C3D2D8B5E8B1648B792CE9E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_5C27A38C6C3D2D8B5E8B1648B792CE9E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_AA638674F893E17D34471648B793A39B" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_AA638674F893E17D34471648B793A39B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NotionalAmountOfNonderivativeInstruments" xlink:label="loc_us-gaap_NotionalAmountOfNonderivativeInstruments_02F9C25F506B116CA1541648B7931ACD" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_us-gaap_NotionalAmountOfNonderivativeInstruments_02F9C25F506B116CA1541648B7931ACD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_85235DB75FC9B35D0C711648B793D0A3" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_8E0CF71B92CCF2A424321648B7911B3A" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_85235DB75FC9B35D0C711648B793D0A3" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DerivativesAndHedgingNotionalAndFairValuesOfDerivativeInstrumentsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_CAAB4B5D9EBA9C99F9291550F3A15665" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_1418B1F4B69C666EAFB81550F3A17E8F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_CAAB4B5D9EBA9C99F9291550F3A15665" xlink:to="loc_us-gaap_DerivativeTable_1418B1F4B69C666EAFB81550F3A17E8F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_4517129CCE2D3CF1B1C41550F3A22DA0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_1418B1F4B69C666EAFB81550F3A17E8F" xlink:to="loc_us-gaap_HedgingDesignationAxis_4517129CCE2D3CF1B1C41550F3A22DA0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_C9001D761AC68B115CDF1550F3A2994E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationAxis_4517129CCE2D3CF1B1C41550F3A22DA0" xlink:to="loc_us-gaap_HedgingDesignationDomain_C9001D761AC68B115CDF1550F3A2994E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_8273F8FEB205DA0334251550F3A5E288" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationDomain_C9001D761AC68B115CDF1550F3A2994E" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_8273F8FEB205DA0334251550F3A5E288" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_A677A93D9CBFD1F389141550F3A5DEBA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationDomain_C9001D761AC68B115CDF1550F3A2994E" xlink:to="loc_us-gaap_NondesignatedMember_A677A93D9CBFD1F389141550F3A5DEBA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_2A4AC830AA2CEE40BC631550F3A5FF18" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_1418B1F4B69C666EAFB81550F3A17E8F" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_2A4AC830AA2CEE40BC631550F3A5FF18" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_69EB6F30A456C66BC42E1550F3A5DF0B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_2A4AC830AA2CEE40BC631550F3A5FF18" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_69EB6F30A456C66BC42E1550F3A5DF0B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_A00D7F010EE221FB21B61550F3A5FE0D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_69EB6F30A456C66BC42E1550F3A5DF0B" xlink:to="loc_us-gaap_ForeignExchangeContractMember_A00D7F010EE221FB21B61550F3A5FE0D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_5E566DDD2A3C95E4BC6E1550F3A54263" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_1418B1F4B69C666EAFB81550F3A17E8F" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_5E566DDD2A3C95E4BC6E1550F3A54263" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_C9F02F134E390E85DAC51550F3A50A74" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_5E566DDD2A3C95E4BC6E1550F3A54263" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_C9F02F134E390E85DAC51550F3A50A74" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_805F8B822412E6B5018F1550F3A53734" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_C9F02F134E390E85DAC51550F3A50A74" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_805F8B822412E6B5018F1550F3A53734" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNoncurrentAssetsMember" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_98B6E53C1148E0A9714D1550F3A5AB3E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_C9F02F134E390E85DAC51550F3A50A74" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_98B6E53C1148E0A9714D1550F3A5AB3E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_EDDA179A6A995E6C12DE1550F3A545C5" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_C9F02F134E390E85DAC51550F3A50A74" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_EDDA179A6A995E6C12DE1550F3A545C5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_EDD37AF2F449A74BD6481550F3A5D4B8" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_C9F02F134E390E85DAC51550F3A50A74" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_EDD37AF2F449A74BD6481550F3A5D4B8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_C9F31E2B5F988918BA601550F3A5AAD4" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_1418B1F4B69C666EAFB81550F3A17E8F" xlink:to="loc_us-gaap_DerivativeLineItems_C9F31E2B5F988918BA601550F3A5AAD4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeNotionalAmount" xlink:label="loc_us-gaap_DerivativeNotionalAmount_1C41333C889A24BFEF921570EC84B243" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_C9F31E2B5F988918BA601550F3A5AAD4" xlink:to="loc_us-gaap_DerivativeNotionalAmount_1C41333C889A24BFEF921570EC84B243" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_A6ABD54E0169DFB3B3421550F3A56EF5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_C9F31E2B5F988918BA601550F3A5AAD4" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_A6ABD54E0169DFB3B3421550F3A56EF5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_7AD800F5F1AFDA316FE11550F3A583B7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_C9F31E2B5F988918BA601550F3A5AAD4" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_7AD800F5F1AFDA316FE11550F3A583B7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTermOfContract" xlink:label="loc_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_C9F31E2B5F988918BA601550F3A5AAD4" xlink:to="loc_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DerivativesAndHedgingScheduleOfAmountsOfDerivativeGainsLossesRecognizedInConsolidatedFinancialStatementsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_967DFD928A5B21373038FC1D25A262B9" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_9247BE2113211FE3B613FC1D25A4A1A6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_967DFD928A5B21373038FC1D25A262B9" xlink:to="loc_us-gaap_DerivativeTable_9247BE2113211FE3B613FC1D25A4A1A6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_E73FCDDF9C52CC14CDE4FC1D25A43193" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9247BE2113211FE3B613FC1D25A4A1A6" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_E73FCDDF9C52CC14CDE4FC1D25A43193" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_E73FCDDF9C52CC14CDE4FC1D25A43193" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesMember" xlink:label="loc_us-gaap_SalesMember_DDB01508E63DD5C211FFFC1D25A479D3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:to="loc_us-gaap_SalesMember_DDB01508E63DD5C211FFFC1D25A479D3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CompensationandBenefitsMember" xlink:label="loc_aon_CompensationandBenefitsMember_27BDEAE1A210D3B6A584FC1D25A5F8B5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:to="loc_aon_CompensationandBenefitsMember_27BDEAE1A210D3B6A584FC1D25A5F8B5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherGeneralExpensesMember" xlink:label="loc_aon_OtherGeneralExpensesMember_8C59DBCDE3AAF8D149A8FC1D25A5790C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:to="loc_aon_OtherGeneralExpensesMember_8C59DBCDE3AAF8D149A8FC1D25A5790C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="loc_us-gaap_InterestExpenseMember_2B0E11FD2A3CF6311ADEFC1D25A692F1" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:to="loc_us-gaap_InterestExpenseMember_2B0E11FD2A3CF6311ADEFC1D25A692F1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherIncomeMember" xlink:label="loc_us-gaap_OtherIncomeMember_375A8F62C4F458136D17FC1D25A628FC" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3A6E23179642954BD1F3FC1D25A4FF2A" xlink:to="loc_us-gaap_OtherIncomeMember_375A8F62C4F458136D17FC1D25A628FC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_92042AD5B52D306DE05BFC1D25A6E3DC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9247BE2113211FE3B613FC1D25A4A1A6" xlink:to="loc_us-gaap_DerivativeLineItems_92042AD5B52D306DE05BFC1D25A6E3DC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_81C7055EAA671487232CFC1D25A77E60" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_92042AD5B52D306DE05BFC1D25A6E3DC" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_81C7055EAA671487232CFC1D25A77E60" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_1175304CB87FAEFD9F2FFC1D25AC6FBD" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_92042AD5B52D306DE05BFC1D25A6E3DC" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_1175304CB87FAEFD9F2FFC1D25AC6FBD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_070E32DA16AB79E5C471FC1D25AC915E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_92042AD5B52D306DE05BFC1D25A6E3DC" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_070E32DA16AB79E5C471FC1D25AC915E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_48BA443C6FC444B37E24FC1D25ACFDEF" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_92042AD5B52D306DE05BFC1D25A6E3DC" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_48BA443C6FC444B37E24FC1D25ACFDEF" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DerivativesAndHedgingTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_D82A50FA13D7E1980148FC11B50B5496" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_40091D65AF5E154858D4FC13795ADDBE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_D82A50FA13D7E1980148FC11B50B5496" xlink:to="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_40091D65AF5E154858D4FC13795ADDBE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_3FE5597F88F72E7E4A36FC11B50E5663" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_D82A50FA13D7E1980148FC11B50B5496" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_3FE5597F88F72E7E4A36FC11B50E5663" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DiscontinuedOperations" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A4CF86258E57E740E577D7486845D4CB" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_392AA9E7248C008D3AC2D7486845388F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A4CF86258E57E740E577D7486845D4CB" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_392AA9E7248C008D3AC2D7486845388F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DiscontinuedOperationsIncomeStatementDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_7E4FD104923B04BAEF4312266EAAEB9E" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_764BF086E83A498E93BB12266EAAB1FF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_7E4FD104923B04BAEF4312266EAAEB9E" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_764BF086E83A498E93BB12266EAAB1FF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_D0EBF0A7F8B1AB6462C112266EAB83A8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_764BF086E83A498E93BB12266EAAB1FF" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_D0EBF0A7F8B1AB6462C112266EAB83A8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_6AB212B6B57A89DA911012266EAB28B9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_D0EBF0A7F8B1AB6462C112266EAB83A8" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_6AB212B6B57A89DA911012266EAB28B9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TempoBusinessMember" xlink:label="loc_aon_TempoBusinessMember_3532C81511DE1C836BCD12266EABB349" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_6AB212B6B57A89DA911012266EAB28B9" xlink:to="loc_aon_TempoBusinessMember_3532C81511DE1C836BCD12266EABB349" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_34375F306753D92E004912266EACD11F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_764BF086E83A498E93BB12266EAAB1FF" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_34375F306753D92E004912266EACD11F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_03447B69F81BEFF78C6412266EACCAC1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_34375F306753D92E004912266EACD11F" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_03447B69F81BEFF78C6412266EACCAC1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember_AA7148F34076B50776B312266EAC5844" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_03447B69F81BEFF78C6412266EACCAC1" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember_AA7148F34076B50776B312266EAC5844" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_764BF086E83A498E93BB12266EAAB1FF" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_EA0B7F440D64C2774B8712266EAC787B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_RevenuesAbstract_EA0B7F440D64C2774B8712266EAC787B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_BB86832DCBA6A8E8BE5812266EADFAAD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_EA0B7F440D64C2774B8712266EAC787B" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_BB86832DCBA6A8E8BE5812266EADFAAD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_C72F9FAB0DC0A8DC9DB212266EADE9C6" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_OperatingExpensesAbstract_C72F9FAB0DC0A8DC9DB212266EADE9C6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_850296D4863FCBD6E03512266EADC78A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C72F9FAB0DC0A8DC9DB212266EADE9C6" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_850296D4863FCBD6E03512266EADC78A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_6D7C8E7994FDA0D9729912266EAE46B2" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_6D7C8E7994FDA0D9729912266EAE46B2" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense" xlink:label="loc_aon_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_BA28AC91267F1F0DB81212266EAE061D" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_aon_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_BA28AC91267F1F0DB81212266EAE061D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_F4DB233E02AAC091F40512266EAE9C41" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_F4DB233E02AAC091F40512266EAE9C41" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_D115F7C2F6B3FA38C2FA12266EAEDF8E" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_D115F7C2F6B3FA38C2FA12266EAEDF8E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeLossfromDiscontinuedOperationsExcludingGainLossonDisposalNetofTaxIncludingPortionAttributabletoNoncontrollingInterest" xlink:label="loc_aon_IncomeLossfromDiscontinuedOperationsExcludingGainLossonDisposalNetofTaxIncludingPortionAttributabletoNoncontrollingInterest_3AB745C473F89B8485FD12266EAEB81D" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_aon_IncomeLossfromDiscontinuedOperationsExcludingGainLossonDisposalNetofTaxIncludingPortionAttributabletoNoncontrollingInterest_3AB745C473F89B8485FD12266EAEB81D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_44DCAAA55AD92E97F90312266EAE749F" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_44DCAAA55AD92E97F90312266EAE749F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_4C787754CEB3FC2D66BF12266EAF89D8" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_0581940228263421D87B12266EACDD45" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_4C787754CEB3FC2D66BF12266EAF89D8" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DiscontinuedOperationsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_5366826C9F53F94949C812266EB4DC8A" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_41D89FF5A47156DEB6A412266EB4C08E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_5366826C9F53F94949C812266EB4DC8A" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_41D89FF5A47156DEB6A412266EB4C08E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_C44C40B198F0E9E1BED712266EB426A8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_41D89FF5A47156DEB6A412266EB4C08E" xlink:to="loc_srt_RangeAxis_C44C40B198F0E9E1BED712266EB426A8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_AA75DD66A71B2D77315212266EB462AA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_C44C40B198F0E9E1BED712266EB426A8" xlink:to="loc_srt_RangeMember_AA75DD66A71B2D77315212266EB462AA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_DACEF6EBF645D5FCE49A12266EB5A5BF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_AA75DD66A71B2D77315212266EB462AA" xlink:to="loc_srt_MaximumMember_DACEF6EBF645D5FCE49A12266EB5A5BF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_048960E74A67C0B39D5F12266EB5CABF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_41D89FF5A47156DEB6A412266EB4C08E" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_048960E74A67C0B39D5F12266EB5CABF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_9E8744A37EC38ACEB75312266EB53C90" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_048960E74A67C0B39D5F12266EB5CABF" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_9E8744A37EC38ACEB75312266EB53C90" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TempoBusinessMember" xlink:label="loc_aon_TempoBusinessMember_75D58417AF9E9CB7B64012266EB50F6D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_9E8744A37EC38ACEB75312266EB53C90" xlink:to="loc_aon_TempoBusinessMember_75D58417AF9E9CB7B64012266EB50F6D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_70F0969F3E2BF1BC3FD812266EB6B60F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_41D89FF5A47156DEB6A412266EB4C08E" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_70F0969F3E2BF1BC3FD812266EB6B60F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_2CA752EB2D6017AACBDB12266EB6E2D5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_70F0969F3E2BF1BC3FD812266EB6B60F" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_2CA752EB2D6017AACBDB12266EB6E2D5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember_A8BAED3CA19D0FBC155312266EB6EF17" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_2CA752EB2D6017AACBDB12266EB6E2D5" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember_A8BAED3CA19D0FBC155312266EB6EF17" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_41D89FF5A47156DEB6A412266EB4C08E" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DisposalGroupIncludingDiscontinuedOperationConsiderationBeforeAdjustment" xlink:label="loc_aon_DisposalGroupIncludingDiscontinuedOperationConsiderationBeforeAdjustment_833BF984BF87D6B87C2712266EB7F6EE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_aon_DisposalGroupIncludingDiscontinuedOperationConsiderationBeforeAdjustment_833BF984BF87D6B87C2712266EB7F6EE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_E0B40E6A5CC05E95607012266EB7EB87" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_E0B40E6A5CC05E95607012266EB7EB87" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DisposalGroupIncludingDiscontinuedOperationDeferredConsideration" xlink:label="loc_aon_DisposalGroupIncludingDiscontinuedOperationDeferredConsideration_2C8EB120D796FA17D26A12266EB73F26" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_aon_DisposalGroupIncludingDiscontinuedOperationDeferredConsideration_2C8EB120D796FA17D26A12266EB73F26" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NumberOfCommercialAgreements" xlink:label="loc_aon_NumberOfCommercialAgreements_26194A858CB91C75C39312266EB74905" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_aon_NumberOfCommercialAgreements_26194A858CB91C75C39312266EB74905" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DisposalGroupIncludingDiscontinuedOperationsDepreciation" xlink:label="loc_aon_DisposalGroupIncludingDiscontinuedOperationsDepreciation_202CAF954E89ADE82C6912266EB7CC6D" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_aon_DisposalGroupIncludingDiscontinuedOperationsDepreciation_202CAF954E89ADE82C6912266EB7CC6D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets" xlink:label="loc_aon_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets_2FBAC523057099108D8112266EB8EC84" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_aon_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets_2FBAC523057099108D8112266EB8EC84" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_8CB154938E85FA71D56612266EB8EAEE" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_AD9EC000AAC1BF326FDE12266EB68E9A" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_8CB154938E85FA71D56612266EB8EAEE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/DiscontinuedOperationsTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_8B59CFC71F9A6E401D99D748687461FB" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock" xlink:label="loc_us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock_B8A70B6E3396D5EC54EDD748688321B0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_8B59CFC71F9A6E401D99D748687461FB" xlink:to="loc_us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock_B8A70B6E3396D5EC54EDD748688321B0" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefits" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6B119CB5F2B62A0F6CC8D7486A3EAF93" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_ED5CE7F10F2DD61DA861D7486A3E36E1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6B119CB5F2B62A0F6CC8D7486A3EAF93" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_ED5CE7F10F2DD61DA861D7486A3E36E1" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsAmountsRecognizedInAccumulatedOtherComprehensiveLossThatHaveNotYetBeenRecognizedDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6C96326BE8B1A0B000FB20B17E378AA7" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_D7A6389B73223CF1525920B17E375FBF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6C96326BE8B1A0B000FB20B17E378AA7" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_D7A6389B73223CF1525920B17E375FBF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_F01599314D779B911B9B20B17E377D54" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_D7A6389B73223CF1525920B17E375FBF" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_F01599314D779B911B9B20B17E377D54" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_522B93E737F9CAA8EE8220B17E378391" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_F01599314D779B911B9B20B17E377D54" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_522B93E737F9CAA8EE8220B17E378391" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_46134602A468D591472320B17E384395" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_522B93E737F9CAA8EE8220B17E378391" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_46134602A468D591472320B17E384395" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_1A103C208BB8AF2F8BCC20B17E3961E9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_D7A6389B73223CF1525920B17E375FBF" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_1A103C208BB8AF2F8BCC20B17E3961E9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_F5504520F13EC3AF91C520B17E39743C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1A103C208BB8AF2F8BCC20B17E3961E9" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_F5504520F13EC3AF91C520B17E39743C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_987306F12E94B3F10DD320B17E39016D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_F5504520F13EC3AF91C520B17E39743C" xlink:to="loc_us-gaap_DomesticPlanMember_987306F12E94B3F10DD320B17E39016D" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_D8F1BE82BB3FD8EBCD5B20B17E3A3B54" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_987306F12E94B3F10DD320B17E39016D" xlink:to="loc_country_US_D8F1BE82BB3FD8EBCD5B20B17E3A3B54" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_5F8718E13001E5879E6320B17E3A107C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_F5504520F13EC3AF91C520B17E39743C" xlink:to="loc_us-gaap_ForeignPlanMember_5F8718E13001E5879E6320B17E3A107C" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_EF8B89050BCBD27A8E5420B17E3A67CF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_5F8718E13001E5879E6320B17E3A107C" xlink:to="loc_country_GB_EF8B89050BCBD27A8E5420B17E3A67CF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_D1861E04D4EF42842E1920B17E3B9A25" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_5F8718E13001E5879E6320B17E3A107C" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_D1861E04D4EF42842E1920B17E3B9A25" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1054F6B662AF8B38BF2220B17E3BEB82" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_D7A6389B73223CF1525920B17E375FBF" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1054F6B662AF8B38BF2220B17E3BEB82" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_B0C5C03CBCE2924992D020B17E3B9EBF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1054F6B662AF8B38BF2220B17E3BEB82" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_B0C5C03CBCE2924992D020B17E3B9EBF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_BA5315376C351A5222A120B17E3BB661" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_B0C5C03CBCE2924992D020B17E3B9EBF" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_BA5315376C351A5222A120B17E3BB661" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_D87FEAEC9943405FE85020B17E3CF32E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_B0C5C03CBCE2924992D020B17E3B9EBF" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_D87FEAEC9943405FE85020B17E3CF32E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_85F858A10C9265AF8D5820B17E3C18A5" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_B0C5C03CBCE2924992D020B17E3B9EBF" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_85F858A10C9265AF8D5820B17E3C18A5" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsAmountsRecognizedInConsolidatedStatementsOfFinancialPositionDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_782D32406CCFC4267F5E9790FB2A4E3F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_93B4B82A2C37DD5640349790FB2A8086" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_782D32406CCFC4267F5E9790FB2A4E3F" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_93B4B82A2C37DD5640349790FB2A8086" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_48EA415F1A4B6F4245129790FB2A765A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_93B4B82A2C37DD5640349790FB2A8086" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_48EA415F1A4B6F4245129790FB2A765A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_7E359A246805A29D23AF9790FB2B7EE2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_48EA415F1A4B6F4245129790FB2A765A" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_7E359A246805A29D23AF9790FB2B7EE2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_A54544AF3D7B07EC22479790FB2B0D4B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_7E359A246805A29D23AF9790FB2B7EE2" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_A54544AF3D7B07EC22479790FB2B0D4B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_E917F919F50DBF5AB8749790FB2B6F6D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_93B4B82A2C37DD5640349790FB2A8086" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_E917F919F50DBF5AB8749790FB2B6F6D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_2E7AF02EE7BA08497C819790FB2B7557" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_E917F919F50DBF5AB8749790FB2B6F6D" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_2E7AF02EE7BA08497C819790FB2B7557" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_C148B23F391C56B299F19790FB2BC5F6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_2E7AF02EE7BA08497C819790FB2B7557" xlink:to="loc_us-gaap_DomesticPlanMember_C148B23F391C56B299F19790FB2BC5F6" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_2FC12564EB9F2D27CAB39790FB2CF656" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_C148B23F391C56B299F19790FB2BC5F6" xlink:to="loc_country_US_2FC12564EB9F2D27CAB39790FB2CF656" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_8E69DB0C3C1EDF8963389790FB2C9B43" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_2E7AF02EE7BA08497C819790FB2B7557" xlink:to="loc_us-gaap_ForeignPlanMember_8E69DB0C3C1EDF8963389790FB2C9B43" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_1512CC05A2939E98793F9790FB2CE991" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_8E69DB0C3C1EDF8963389790FB2C9B43" xlink:to="loc_country_GB_1512CC05A2939E98793F9790FB2CE991" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_01D356B78512035303939790FB2CE7BE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_8E69DB0C3C1EDF8963389790FB2C9B43" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_01D356B78512035303939790FB2CE7BE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_93B4B82A2C37DD5640349790FB2A8086" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_A2A4B0798955C6439B479790FB2D1661" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_A2A4B0798955C6439B479790FB2D1661" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_7C08B42B0634BB8A43C89790FB2DC24C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_7C08B42B0634BB8A43C89790FB2DC24C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_91A595053DB6D0ADC5A89790FB2D679C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_91A595053DB6D0ADC5A89790FB2D679C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_DEF9C5F9B4A6680343C69790FB2D342E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_DEF9C5F9B4A6680343C69790FB2D342E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_D82391158F6533E8072F9790FB2D98D3" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0FFBA3564B1B70F645909790FB2CE957" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_D82391158F6533E8072F9790FB2D98D3" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsCashFlowsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_FAB2A6E0BF8BD3DBB04920B17B9EBD7B" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_158BE97CA9268B068DB820B17B9EF0E1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_FAB2A6E0BF8BD3DBB04920B17B9EBD7B" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_158BE97CA9268B068DB820B17B9EF0E1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_8455492E0DA4EE69973220C301B9C429" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_158BE97CA9268B068DB820B17B9EF0E1" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_8455492E0DA4EE69973220C301B9C429" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_A779D35ABB3A3A76BD4320C301BC52A2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_8455492E0DA4EE69973220C301B9C429" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_A779D35ABB3A3A76BD4320C301BC52A2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_F160EECA6EF3FF9C0F4A20C35AFD9545" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_A779D35ABB3A3A76BD4320C301BC52A2" xlink:to="loc_us-gaap_DomesticPlanMember_F160EECA6EF3FF9C0F4A20C35AFD9545" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_E78C53E03468ADFABA3720C302326E81" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_F160EECA6EF3FF9C0F4A20C35AFD9545" xlink:to="loc_country_US_E78C53E03468ADFABA3720C302326E81" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_77E0B1A5905653FD72B320C3C8C849D8" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_A779D35ABB3A3A76BD4320C301BC52A2" xlink:to="loc_us-gaap_ForeignPlanMember_77E0B1A5905653FD72B320C3C8C849D8" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_5B3E3C6C795DC1A91F6820C301FAAD44" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_77E0B1A5905653FD72B320C3C8C849D8" xlink:to="loc_country_GB_5B3E3C6C795DC1A91F6820C301FAAD44" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_953586C4A6FD92EC0C6E20C302DC9340" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_77E0B1A5905653FD72B320C3C8C849D8" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_953586C4A6FD92EC0C6E20C302DC9340" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_EB1269E9AEC921A714BC20B17B9E8087" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_158BE97CA9268B068DB820B17B9EF0E1" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_EB1269E9AEC921A714BC20B17B9E8087" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_6803EADC008558614AB420B17B9FB643" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_EB1269E9AEC921A714BC20B17B9E8087" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_6803EADC008558614AB420B17B9FB643" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_F7A44E86FC342A24F68220C3027F173F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_6803EADC008558614AB420B17B9FB643" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_F7A44E86FC342A24F68220C3027F173F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8B6AF59EC065BD533A4420B17B9F8478" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_6803EADC008558614AB420B17B9FB643" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8B6AF59EC065BD533A4420B17B9F8478" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6E5A0A1A52C759E7996320B17B9F32D7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_158BE97CA9268B068DB820B17B9EF0E1" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6E5A0A1A52C759E7996320B17B9F32D7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_87F5DB522BE14A19300420B17BA00485" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6E5A0A1A52C759E7996320B17B9F32D7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_87F5DB522BE14A19300420B17BA00485" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_9334D10A99E1DD34219620B17BA07CEC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6E5A0A1A52C759E7996320B17B9F32D7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_9334D10A99E1DD34219620B17BA07CEC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_0EF6E9CD5983AA07396E20B17BA01446" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_6E5A0A1A52C759E7996320B17B9F32D7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_0EF6E9CD5983AA07396E20B17BA01446" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsComponentsOfNetPeriodicBenefitCostDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_E181B15DD19C91A2AF4CDC660595FA87" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_90878FEEC04CFEB888F8DC6605957B62" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_E181B15DD19C91A2AF4CDC660595FA87" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_90878FEEC04CFEB888F8DC6605957B62" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_C257167CF6A61285E38FDC6605955E93" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_90878FEEC04CFEB888F8DC6605957B62" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_C257167CF6A61285E38FDC6605955E93" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_752F84786D2A7AE69AA0DC660596D915" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_C257167CF6A61285E38FDC6605955E93" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_752F84786D2A7AE69AA0DC660596D915" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_52316EE78BCF09C51A17DC6605964CC5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_752F84786D2A7AE69AA0DC660596D915" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_52316EE78BCF09C51A17DC6605964CC5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_1733F808D1462C17AE74DC6605963940" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_90878FEEC04CFEB888F8DC6605957B62" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_1733F808D1462C17AE74DC6605963940" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_500A2F8F3088AA761288DC6605966A3A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1733F808D1462C17AE74DC6605963940" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_500A2F8F3088AA761288DC6605966A3A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_CAF115221D5F0D74E36BDC6605978C97" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_500A2F8F3088AA761288DC6605966A3A" xlink:to="loc_us-gaap_DomesticPlanMember_CAF115221D5F0D74E36BDC6605978C97" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_B442A233AFC72A3487DFDC6605977933" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_CAF115221D5F0D74E36BDC6605978C97" xlink:to="loc_country_US_B442A233AFC72A3487DFDC6605977933" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_F0DC1BF216B480B3CCB9DC660597AA16" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_500A2F8F3088AA761288DC6605966A3A" xlink:to="loc_us-gaap_ForeignPlanMember_F0DC1BF216B480B3CCB9DC660597AA16" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_E00A46C0D75B58D80D73DC6605982FB5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_F0DC1BF216B480B3CCB9DC660597AA16" xlink:to="loc_country_GB_E00A46C0D75B58D80D73DC6605982FB5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_DDEE2D21B0FC75B31B41DC660598FDEC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_F0DC1BF216B480B3CCB9DC660597AA16" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_DDEE2D21B0FC75B31B41DC660598FDEC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_90878FEEC04CFEB888F8DC6605957B62" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_1D02C39F860F92A35157DC660599A059" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_1D02C39F860F92A35157DC660599A059" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_CC3A0737BC9387A63471DC66059910F9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_CC3A0737BC9387A63471DC66059910F9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_F94A75B5AE6749AF5D55DC6605991EF7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_F94A75B5AE6749AF5D55DC6605991EF7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_499492B80F38AFE5AF27DC6605996B78" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_499492B80F38AFE5AF27DC6605996B78" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_F6B46E91BD891D3E3A2BDC6605995978" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_F6B46E91BD891D3E3A2BDC6605995978" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDuetoSettlementsandCurtailments" xlink:label="loc_aon_DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDuetoSettlementsandCurtailments_CFFA6456D7D90563E5A2DC66059A627D" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_aon_DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDuetoSettlementsandCurtailments_CFFA6456D7D90563E5A2DC66059A627D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_8C692F449A083EBC9EC2DC66059A5946" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_8C692F449A083EBC9EC2DC66059A5946" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_9DB89C075A39ACA773C8DC66059A14CC" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_F8EC4C6D23105ED1F187DC6605982155" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_9DB89C075A39ACA773C8DC66059A14CC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_3B0A1F707E53CF180EFA9790FAB0ECBA" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_997B8FCE6E7DA6B3F7C99790FAB1AEE8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_3B0A1F707E53CF180EFA9790FAB0ECBA" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_997B8FCE6E7DA6B3F7C99790FAB1AEE8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_E13DFD84DA6733DB4C2A9790FAB1489E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_997B8FCE6E7DA6B3F7C99790FAB1AEE8" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_E13DFD84DA6733DB4C2A9790FAB1489E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_E8C3D65FEBFEB1BF20C09790FAB10BAD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_E13DFD84DA6733DB4C2A9790FAB1489E" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_E8C3D65FEBFEB1BF20C09790FAB10BAD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_3C6E7D12ED5EEA727B309790FAB1104D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_E8C3D65FEBFEB1BF20C09790FAB10BAD" xlink:to="loc_us-gaap_DomesticPlanMember_3C6E7D12ED5EEA727B309790FAB1104D" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_CBF8B8A44047F3A8E0719790FAB24E4C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_3C6E7D12ED5EEA727B309790FAB1104D" xlink:to="loc_country_US_CBF8B8A44047F3A8E0719790FAB24E4C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_21D210AABA85C203C17D9790FAB219B2" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_E8C3D65FEBFEB1BF20C09790FAB10BAD" xlink:to="loc_us-gaap_ForeignPlanMember_21D210AABA85C203C17D9790FAB219B2" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_2B24C8FC185E01F053FE9790FAB244F4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_21D210AABA85C203C17D9790FAB219B2" xlink:to="loc_country_GB_2B24C8FC185E01F053FE9790FAB244F4" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_68B35F8C24BE119B470D9790FAB2224E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_21D210AABA85C203C17D9790FAB219B2" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_68B35F8C24BE119B470D9790FAB2224E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_38397EE004B9E0935CE49790FAB22E5E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_997B8FCE6E7DA6B3F7C99790FAB1AEE8" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_38397EE004B9E0935CE49790FAB22E5E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3161A4969162090FA3799790FAB3F891" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_38397EE004B9E0935CE49790FAB22E5E" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3161A4969162090FA3799790FAB3F891" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_3DB0B3DDFB5A370ED6BF9790FAB32CCB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3161A4969162090FA3799790FAB3F891" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_3DB0B3DDFB5A370ED6BF9790FAB32CCB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_997B8FCE6E7DA6B3F7C99790FAB1AEE8" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_E76C0F52DD40C8DC80DF9790FAB3D276" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_E76C0F52DD40C8DC80DF9790FAB3D276" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_F20008CCB38A76292B479790FAB409EF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_F20008CCB38A76292B479790FAB409EF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_8A7745665BE6BA68A6789790FAB43135" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_8A7745665BE6BA68A6789790FAB43135" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_193418B23401389A388C9790FAB41FA4" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_193418B23401389A388C9790FAB41FA4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_9C5B685CB2D29BBD59969790FAB484A2" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_9C5B685CB2D29BBD59969790FAB484A2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_336BA31668E9D8561B189790FAB4F61A" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A180E7FB9EC8CB9729F19790FAB310C0" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_336BA31668E9D8561B189790FAB4F61A" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsExpectedReturnOnPlanAssetsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_840B3002EB479231E444DC6605372710" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_BE26537E78FF61A4C210DC660538D43C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_840B3002EB479231E444DC6605372710" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_BE26537E78FF61A4C210DC660538D43C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_3DD2B556E5AC47255B33DC6605387C10" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_BE26537E78FF61A4C210DC660538D43C" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_3DD2B556E5AC47255B33DC6605387C10" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_FFE392B4D79CFADE17F2DC660538F9CC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_3DD2B556E5AC47255B33DC6605387C10" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_FFE392B4D79CFADE17F2DC660538F9CC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_595BBF83B47C63C590C9DC6C67302B3B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_FFE392B4D79CFADE17F2DC660538F9CC" xlink:to="loc_us-gaap_DomesticPlanMember_595BBF83B47C63C590C9DC6C67302B3B" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_45F90945CEE4D9F40064DC66053E6225" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_595BBF83B47C63C590C9DC6C67302B3B" xlink:to="loc_country_US_45F90945CEE4D9F40064DC66053E6225" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_7EDEC1FCB6224688FEE5DC66053E2F03" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_BE26537E78FF61A4C210DC660538D43C" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_7EDEC1FCB6224688FEE5DC66053E2F03" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_53B3F76F7C831EABCF4FDC66053EAFF4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_7EDEC1FCB6224688FEE5DC66053E2F03" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_53B3F76F7C831EABCF4FDC66053EAFF4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_BB642C1AA8BB70ADA462DC66053E4CDE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_53B3F76F7C831EABCF4FDC66053EAFF4" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_BB642C1AA8BB70ADA462DC66053E4CDE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_4FD343904797B5726B88DC66053FB533" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_BE26537E78FF61A4C210DC660538D43C" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_4FD343904797B5726B88DC66053FB533" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_1391FAEFA970FB15B7F1DC66053F93F4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_4FD343904797B5726B88DC66053FB533" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_1391FAEFA970FB15B7F1DC66053F93F4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsInvestmentPolicyAndStrategyNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_3A60229EAAF0868E45F72A57DF9D95DD" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_07443B8224C47C3AFD912A57DF9D0BD3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_3A60229EAAF0868E45F72A57DF9D95DD" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_07443B8224C47C3AFD912A57DF9D0BD3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_8462D9913C56D8D5FDCE2A57DF9D5492" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_07443B8224C47C3AFD912A57DF9D0BD3" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_8462D9913C56D8D5FDCE2A57DF9D5492" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_D9947C7BB14187E53F5C2A57DF9D988C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8462D9913C56D8D5FDCE2A57DF9D5492" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_D9947C7BB14187E53F5C2A57DF9D988C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_31D7E9B22EB579880FD62A57DF9DD636" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_D9947C7BB14187E53F5C2A57DF9D988C" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_31D7E9B22EB579880FD62A57DF9DD636" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_8B1653B3E40349CAF3CF2A57DF9DF833" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_07443B8224C47C3AFD912A57DF9D0BD3" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_8B1653B3E40349CAF3CF2A57DF9DF833" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_EA824160388C84CCD1F12A57DF9D3D97" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_8B1653B3E40349CAF3CF2A57DF9DF833" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_EA824160388C84CCD1F12A57DF9D3D97" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_D509AEB5C64F14FC7ED32A57DF9D6077" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_EA824160388C84CCD1F12A57DF9D3D97" xlink:to="loc_us-gaap_DomesticPlanMember_D509AEB5C64F14FC7ED32A57DF9D6077" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_D0E58BA011ACA5EDBA292A57DF9DF49E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_D509AEB5C64F14FC7ED32A57DF9D6077" xlink:to="loc_country_US_D0E58BA011ACA5EDBA292A57DF9DF49E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_F08A246DDA02BF35C4692A57DF9DCC99" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_EA824160388C84CCD1F12A57DF9D3D97" xlink:to="loc_us-gaap_ForeignPlanMember_F08A246DDA02BF35C4692A57DF9DCC99" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0BD53691BFB26DEA35CB2A57DF9D6CD6" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_07443B8224C47C3AFD912A57DF9D0BD3" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0BD53691BFB26DEA35CB2A57DF9D6CD6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_6B469EB6BBED473788EC2A57DF9D851D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0BD53691BFB26DEA35CB2A57DF9D6CD6" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_6B469EB6BBED473788EC2A57DF9D851D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_DF1C51D51309ED4EC3CB2A57DF9D2E9C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6B469EB6BBED473788EC2A57DF9D851D" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_DF1C51D51309ED4EC3CB2A57DF9D2E9C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FixedIncomeInvestmentsMember" xlink:label="loc_us-gaap_FixedIncomeInvestmentsMember_8FA675EE8A4B96611F222A57DF9D03D3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6B469EB6BBED473788EC2A57DF9D851D" xlink:to="loc_us-gaap_FixedIncomeInvestmentsMember_8FA675EE8A4B96611F222A57DF9D03D3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLongTermInvestmentsMember" xlink:label="loc_us-gaap_OtherLongTermInvestmentsMember_856ECF38523C2E0C894F2A57DF9D1142" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6B469EB6BBED473788EC2A57DF9D851D" xlink:to="loc_us-gaap_OtherLongTermInvestmentsMember_856ECF38523C2E0C894F2A57DF9D1142" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_68C61BFF6B4C2BD2A0932A57DF9D33D4" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_07443B8224C47C3AFD912A57DF9D0BD3" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_68C61BFF6B4C2BD2A0932A57DF9D33D4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_CBDAE8A8C5AAF9116FCA2A57DF9D7C6A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_68C61BFF6B4C2BD2A0932A57DF9D33D4" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_CBDAE8A8C5AAF9116FCA2A57DF9D7C6A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_FEB65BBF04025BF11A5B2A57DF9DB026" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_68C61BFF6B4C2BD2A0932A57DF9D33D4" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_FEB65BBF04025BF11A5B2A57DF9DB026" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsOverviewOfAccumulatedBenefitObligationFairValueOfPlanAssetsFundedStatusAndNetAmountRecognizedForUSAndCanadianOtherPostRetirementBenefitsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D4641F1BC22F9A07D0E92545BD6042CF" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_26870AB5033734EAABEC2545BD60354C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D4641F1BC22F9A07D0E92545BD6042CF" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_26870AB5033734EAABEC2545BD60354C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_51D786BA6EF6F40FEA292545BD619007" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_26870AB5033734EAABEC2545BD60354C" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_51D786BA6EF6F40FEA292545BD619007" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_C54EDE07528F45C26EA42545BD616EB7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_51D786BA6EF6F40FEA292545BD619007" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_C54EDE07528F45C26EA42545BD616EB7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_F64B6D4DA5D4717243692545BD61B0D5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_C54EDE07528F45C26EA42545BD616EB7" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_F64B6D4DA5D4717243692545BD61B0D5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_26870AB5033734EAABEC2545BD60354C" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_DA89E5C18BD840D599CA2545BD6211FA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_DA89E5C18BD840D599CA2545BD6211FA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_938F10F3B7A620BE044A2545BD67EED8" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_938F10F3B7A620BE044A2545BD67EED8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_63D870C9B378D2BED53E2545BD67F886" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_63D870C9B378D2BED53E2545BD67F886" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_558479B9302C59AD2FED2545BD683FD5" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/netLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_558479B9302C59AD2FED2545BD683FD5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_83FCC4F06EE8401FFB6D2545BD68ACD8" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_83FCC4F06EE8401FFB6D2545BD68ACD8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_8651F34F0F4292EEC3F82545C4716D75" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A0EAC74E4E6980CAEDD72545BD62FA49" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_8651F34F0F4292EEC3F82545C4716D75" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsPensionPlansNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D20BEB99434F345D634F1BD3357E10A7" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8D2A19D64BE3A7E4816A1BD3357E07BF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D20BEB99434F345D634F1BD3357E10A7" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8D2A19D64BE3A7E4816A1BD3357E07BF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_B0EF6FFE9E59DABF16751BD3357EB202" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8D2A19D64BE3A7E4816A1BD3357E07BF" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_B0EF6FFE9E59DABF16751BD3357EB202" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_700BE2AA433DAE87A3941BD3357E50AD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_B0EF6FFE9E59DABF16751BD3357EB202" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_700BE2AA433DAE87A3941BD3357E50AD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_AE4F63F8E75D3E201BB31BD3357F01A7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_700BE2AA433DAE87A3941BD3357E50AD" xlink:to="loc_us-gaap_DomesticPlanMember_AE4F63F8E75D3E201BB31BD3357F01A7" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_871445AB06BDFB7E3DAC1BD3357FE51E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_AE4F63F8E75D3E201BB31BD3357F01A7" xlink:to="loc_country_US_871445AB06BDFB7E3DAC1BD3357FE51E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_647EC790A31CEF6088CF1BD335804608" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_700BE2AA433DAE87A3941BD3357E50AD" xlink:to="loc_us-gaap_ForeignPlanMember_647EC790A31CEF6088CF1BD335804608" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_D42D233DABDA25D7C3961BD3358036EA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_647EC790A31CEF6088CF1BD335804608" xlink:to="loc_country_GB_D42D233DABDA25D7C3961BD3358036EA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_6522C0C316BF5C13EA4A1BD33580C12A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_647EC790A31CEF6088CF1BD335804608" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_6522C0C316BF5C13EA4A1BD33580C12A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_BA1372EC2C94B52BE5571BD33580F659" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8D2A19D64BE3A7E4816A1BD3357E07BF" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_BA1372EC2C94B52BE5571BD33580F659" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_267A8F31441286A6D7EE1BD33580F821" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_BA1372EC2C94B52BE5571BD33580F659" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_267A8F31441286A6D7EE1BD33580F821" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_267B9D6C11ECC33D0A721BD33581D90E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_267A8F31441286A6D7EE1BD33580F821" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_267B9D6C11ECC33D0A721BD33581D90E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8D2A19D64BE3A7E4816A1BD3357E07BF" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanPercentageOfTotalPensionObligations" xlink:label="loc_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate" xlink:label="loc_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_F76A7E4FED3263E0A5C11BD33582AD09" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_F76A7E4FED3263E0A5C11BD33582AD09" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_BD43C1EB5F5E34EB7F3F1BD33582EF60" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_BD43C1EB5F5E34EB7F3F1BD33582EF60" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_FDE438A6E8296621992A1BD335829EC8" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_FDE438A6E8296621992A1BD335829EC8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease_C739C9922BD18554FA861BD335839006" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease_C739C9922BD18554FA861BD335839006" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_0DCA7A09092612F6EFF61BD335833BDF" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_0DCA7A09092612F6EFF61BD335833BDF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_537AE26F1D300A6F673D1BD33583CAFB" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_089CBB85329F9EB446861BD33581ACCF" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_537AE26F1D300A6F673D1BD33583CAFB" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsReconciliationOfChangesInBenefitObligationsAndFairValueOfAssetsAndStatementOfFundedStatusDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6487F02AF8B37D1DC1EF2A57E00B185E" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C447B2EB7940748D6E6F2A57E00BD4AF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6487F02AF8B37D1DC1EF2A57E00B185E" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C447B2EB7940748D6E6F2A57E00BD4AF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_C513CDC6D07927ED96F92A57E00BAB81" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C447B2EB7940748D6E6F2A57E00BD4AF" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_C513CDC6D07927ED96F92A57E00BAB81" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5879FC65482FE0F900C52A57E00B0A69" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_C513CDC6D07927ED96F92A57E00BAB81" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5879FC65482FE0F900C52A57E00B0A69" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_7E40B16FC925B6F351A92A57E00B6A97" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_5879FC65482FE0F900C52A57E00B0A69" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_7E40B16FC925B6F351A92A57E00B6A97" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_0155C11E072BAC2146292A57E00B13ED" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C447B2EB7940748D6E6F2A57E00BD4AF" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_0155C11E072BAC2146292A57E00B13ED" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_4B3F76002C1A0BD1EBFE2A57E00BD721" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_0155C11E072BAC2146292A57E00B13ED" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_4B3F76002C1A0BD1EBFE2A57E00BD721" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_94E495056D80015CA2892A57E00BCA26" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4B3F76002C1A0BD1EBFE2A57E00BD721" xlink:to="loc_us-gaap_DomesticPlanMember_94E495056D80015CA2892A57E00BCA26" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_17E35CE5F4D5BCF6E0452A57E00B4DB2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_94E495056D80015CA2892A57E00BCA26" xlink:to="loc_country_US_17E35CE5F4D5BCF6E0452A57E00B4DB2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_4BDF963F0CCE2D37126C2A57E00BCE4C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4B3F76002C1A0BD1EBFE2A57E00BD721" xlink:to="loc_us-gaap_ForeignPlanMember_4BDF963F0CCE2D37126C2A57E00BCE4C" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_6043E20D1A734324423B2A57E00BBD7F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_4BDF963F0CCE2D37126C2A57E00BCE4C" xlink:to="loc_country_GB_6043E20D1A734324423B2A57E00BBD7F" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_578B9E21FF8FAD7220772A57E00B059E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_4BDF963F0CCE2D37126C2A57E00BCE4C" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_578B9E21FF8FAD7220772A57E00B059E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D933771BE93C098A619C2A57E00BD7AC" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_C447B2EB7940748D6E6F2A57E00BD4AF" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D933771BE93C098A619C2A57E00BD7AC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D933771BE93C098A619C2A57E00BD7AC" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_6669C7E10019F84FBA9A2A57E00BB5AB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_6669C7E10019F84FBA9A2A57E00BB5AB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_13A14A41154F0801D2002A57E00B7F61" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_13A14A41154F0801D2002A57E00B7F61" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_D90D45881D260F0376F52A57E00BA2A3" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_D90D45881D260F0376F52A57E00BA2A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAmendments" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAmendments_57B3232D4C0B5D6408B92A57E00B98BE" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAmendments_57B3232D4C0B5D6408B92A57E00B98BE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_BB04A884DEC1AE93F2962A57E00B2CDC" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_BB04A884DEC1AE93F2962A57E00B2CDC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_E24C197323FD516028912A57E00BDEF9" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_E24C197323FD516028912A57E00BDEF9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_D194B3E3FFE693FD60B32A57E00BAB0C" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_D194B3E3FFE693FD60B32A57E00BAB0C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_E74CEE91213F4ECD0CF02A57E00B8FD8" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_E74CEE91213F4ECD0CF02A57E00B8FD8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_7F3A32FE3F2AF4627B632A57E00BA99F" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_4CDA1F26503DC7A9A2A82A57E00BCC35" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_7F3A32FE3F2AF4627B632A57E00BA99F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_764929B6F58A8FF7A9A82A57E00B9B78" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D933771BE93C098A619C2A57E00BD7AC" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_764929B6F58A8FF7A9A82A57E00B9B78" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D933771BE93C098A619C2A57E00BD7AC" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_C57C2C3EF74B7BD690BC2A57E00B9F92" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_C57C2C3EF74B7BD690BC2A57E00B9F92" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_0140BFEAB86B2787C4A02A57E01A8D38" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_0140BFEAB86B2787C4A02A57E01A8D38" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_1F1FA56675403CE949422A57E01A39E8" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_1F1FA56675403CE949422A57E01A39E8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_E842489F856F37AE9BE22A57E01ABFF3" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_E842489F856F37AE9BE22A57E01ABFF3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_CDA53EF610DDA756160E2A57E01A2FEE" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_CDA53EF610DDA756160E2A57E01A2FEE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_9994E2F18AC6F82E2D0F2A57E01A912F" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_9994E2F18AC6F82E2D0F2A57E01A912F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_58C43F467540672F471C2A57E01AB2A5" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_58C43F467540672F471C2A57E01AB2A5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanMarketRelatedValue" xlink:label="loc_aon_DefinedBenefitPlanMarketRelatedValue_7F087FE888C754963D032A57E01A2A66" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_aon_DefinedBenefitPlanMarketRelatedValue_7F087FE888C754963D032A57E01A2A66" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_429D9786560D7706C9732A57E01A87F3" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_429D9786560D7706C9732A57E01A87F3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_CD2383A91F7D3D0CA69F2A57E01A5368" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_CD2383A91F7D3D0CA69F2A57E01A5368" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_05C6E326AB63DE30A1B62A57E01AA938" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_05C6E326AB63DE30A1B62A57E01AA938" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_DAE551C45EA2F13C99352A57E01A1A2C" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_88CFAE255050D7A2987D2A57E00B87B7" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_DAE551C45EA2F13C99352A57E01A1A2C" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleOfChangesInLevel3FairValueForUKPensionPlansDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D973EBD25E632D2BB710F9A54D8D23A7" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9CC49593DB20B1556C5EF9A54D8D3E09" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D973EBD25E632D2BB710F9A54D8D23A7" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9CC49593DB20B1556C5EF9A54D8D3E09" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_34883F3BD9C9E9959436F9A54D8E3427" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9CC49593DB20B1556C5EF9A54D8D3E09" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_34883F3BD9C9E9959436F9A54D8E3427" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_2FB18381BDFF545F9EB1F9A54D8E0400" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_34883F3BD9C9E9959436F9A54D8E3427" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_2FB18381BDFF545F9EB1F9A54D8E0400" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_3F0EAD685F44858B80A0F9A54D93AAB9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_2FB18381BDFF545F9EB1F9A54D8E0400" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_3F0EAD685F44858B80A0F9A54D93AAB9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_1CFF7523C5ADFDAE5834F9A54D94EF7E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9CC49593DB20B1556C5EF9A54D8D3E09" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_1CFF7523C5ADFDAE5834F9A54D94EF7E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_5148DD36F1D347BA4550F9A54D94F203" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1CFF7523C5ADFDAE5834F9A54D94EF7E" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_5148DD36F1D347BA4550F9A54D94F203" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_7B140049158C84A854CCF9A54D940869" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_5148DD36F1D347BA4550F9A54D94F203" xlink:to="loc_us-gaap_ForeignPlanMember_7B140049158C84A854CCF9A54D940869" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_DB8272469C3A8C21AE0AF9A54D956046" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_7B140049158C84A854CCF9A54D940869" xlink:to="loc_country_GB_DB8272469C3A8C21AE0AF9A54D956046" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_270DC816D83BD7E90760F9A54D954430" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9CC49593DB20B1556C5EF9A54D8D3E09" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_270DC816D83BD7E90760F9A54D954430" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BEDDDE21F67FDC2291A7F9A54D95B19C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_270DC816D83BD7E90760F9A54D954430" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BEDDDE21F67FDC2291A7F9A54D95B19C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_0D9BBCFAA9496408D450F9A54D953098" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BEDDDE21F67FDC2291A7F9A54D95B19C" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_0D9BBCFAA9496408D450F9A54D953098" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_C7C8B41D0AD5BCC311B0F9A54D9694F0" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9CC49593DB20B1556C5EF9A54D8D3E09" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_C7C8B41D0AD5BCC311B0F9A54D9694F0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_AFF9ADFAB32C098C4B0FF9A54D9792A5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_C7C8B41D0AD5BCC311B0F9A54D9694F0" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_AFF9ADFAB32C098C4B0FF9A54D9792A5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_AFF9ADFAB32C098C4B0FF9A54D9792A5" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_B446496811ED4A21E36DF9A54D979F2F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_B446496811ED4A21E36DF9A54D979F2F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_029A527F77DC8AE9B89AF9A54D98201D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_029A527F77DC8AE9B89AF9A54D98201D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements" xlink:label="loc_us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements_8895E10955A862C65E17F9A54D98F9BB" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:to="loc_us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements_8895E10955A862C65E17F9A54D98F9BB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_5776BC4AD895A2BE5924F9A54D98BFDE" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_5776BC4AD895A2BE5924F9A54D98BFDE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_761E9A9F131843979231F9A54D9808BC" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_5E231E3D9F679B8D40D7F9A54D970A23" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_761E9A9F131843979231F9A54D9808BC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleOfExpenseRecognizedInCompensationAndBenefitInConsolidatedStatementsOfIncomeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_F0A47EB780D4206A4B27DC660644B8CE" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3CEF9A97091EB9C15FEDDC6606443962" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_F0A47EB780D4206A4B27DC660644B8CE" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3CEF9A97091EB9C15FEDDC6606443962" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_98651519D86EB1EF645BDC660644152C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3CEF9A97091EB9C15FEDDC6606443962" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_98651519D86EB1EF645BDC660644152C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_2D94685B34A3AE433543DC6606454EE6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_98651519D86EB1EF645BDC660644152C" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_2D94685B34A3AE433543DC6606454EE6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_66E19D721EDC41FC27BDDC6606457BF1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_2D94685B34A3AE433543DC6606454EE6" xlink:to="loc_us-gaap_DomesticPlanMember_66E19D721EDC41FC27BDDC6606457BF1" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_B5115BF7D3317E8FCF3BDC66064558EC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_66E19D721EDC41FC27BDDC6606457BF1" xlink:to="loc_country_US_B5115BF7D3317E8FCF3BDC66064558EC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_8FF0CD7157E7A48126A1DC6606462D2A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_2D94685B34A3AE433543DC6606454EE6" xlink:to="loc_us-gaap_ForeignPlanMember_8FF0CD7157E7A48126A1DC6606462D2A" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_7EC6A0FCB8A4DE95BBA6DC660646CAF4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_8FF0CD7157E7A48126A1DC6606462D2A" xlink:to="loc_country_GB_7EC6A0FCB8A4DE95BBA6DC660646CAF4" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_AA4F651194291295E4D0DC660646C663" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_8FF0CD7157E7A48126A1DC6606462D2A" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_AA4F651194291295E4D0DC660646C663" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_08D74CE2C6FE5EE41A0CDC660646A70C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3CEF9A97091EB9C15FEDDC6606443962" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_08D74CE2C6FE5EE41A0CDC660646A70C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_CF22E42B6EB565B07DDEDC66064629C4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_08D74CE2C6FE5EE41A0CDC660646A70C" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_CF22E42B6EB565B07DDEDC66064629C4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleOfFairValueOfOtherPlanAssetsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_31F6CDF98D03966443D720724031C824" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_31F6CDF98D03966443D720724031C824" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_06017D28439BD0E233032072403226D3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_06017D28439BD0E233032072403226D3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_2B6395D0C0EBDD726150207240329969" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_06017D28439BD0E233032072403226D3" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_2B6395D0C0EBDD726150207240329969" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_1F1C808C411B6464EDF9207240325268" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_2B6395D0C0EBDD726150207240329969" xlink:to="loc_us-gaap_ForeignPlanMember_1F1C808C411B6464EDF9207240325268" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_C2EB6EA63AEF51BF5AC021095F82397B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_1F1C808C411B6464EDF9207240325268" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_C2EB6EA63AEF51BF5AC021095F82397B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_1D7A9F04A3A3E58C5522207240331D51" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_1D7A9F04A3A3E58C5522207240331D51" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3EDFD758B46BB479BF8920724033699F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_1D7A9F04A3A3E58C5522207240331D51" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3EDFD758B46BB479BF8920724033699F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_56CDDA3E8D04E824331B2072403348C0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3EDFD758B46BB479BF8920724033699F" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_56CDDA3E8D04E824331B2072403348C0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1B0FF64720D9413C474F207240333CBB" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1B0FF64720D9413C474F207240333CBB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_39FFE9BE2B6C8A8743992072403440E9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1B0FF64720D9413C474F207240333CBB" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_39FFE9BE2B6C8A8743992072403440E9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_47737A370BC17AFBB64420724034E3A5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_39FFE9BE2B6C8A8743992072403440E9" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_47737A370BC17AFBB64420724034E3A5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_1DB04DC430810710FD88207240349AFB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_39FFE9BE2B6C8A8743992072403440E9" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_1DB04DC430810710FD88207240349AFB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_C5B8421D3D1D6DB9754820724034F052" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_39FFE9BE2B6C8A8743992072403440E9" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_C5B8421D3D1D6DB9754820724034F052" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_CDF67BE5F3782F01AE2C20724034DB06" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_CDF67BE5F3782F01AE2C20724034DB06" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_CDF67BE5F3782F01AE2C20724034DB06" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1CFA27926A28791B9EDE20724035D727" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1CFA27926A28791B9EDE20724035D727" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EquityInvestmentsPooledFundsMember" xlink:label="loc_aon_EquityInvestmentsPooledFundsMember_AB440CEEBADFEE49624020724035978C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:to="loc_aon_EquityInvestmentsPooledFundsMember_AB440CEEBADFEE49624020724035978C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDerivativeMember" xlink:label="loc_us-gaap_DefinedBenefitPlanDerivativeMember_083EA129C10873BA151220C44ACAB634" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:to="loc_us-gaap_DefinedBenefitPlanDerivativeMember_083EA129C10873BA151220C44ACAB634" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FixedIncomeInvestmentsPooledFundsMember" xlink:label="loc_aon_FixedIncomeInvestmentsPooledFundsMember_6D3C63C4061AE51435C020724035939D" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:to="loc_aon_FixedIncomeInvestmentsPooledFundsMember_6D3C63C4061AE51435C020724035939D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AlternativeInvestmentsMember" xlink:label="loc_aon_AlternativeInvestmentsMember_3BEB3A3688B261AF2EBD207240354690" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:to="loc_aon_AlternativeInvestmentsMember_3BEB3A3688B261AF2EBD207240354690" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RealEstateAndRealEstateInvestmentTrustMember" xlink:label="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_CFDC7618FB5A8EEC22F720724035181C" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_384B6CD42E0D45373F0520724035D893" xlink:to="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_CFDC7618FB5A8EEC22F720724035181C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_5D53EA084E7ECD6F5FB220724035D1FF" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_461FD0DEF2CE7090B19E207240315F8E" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_5D53EA084E7ECD6F5FB220724035D1FF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_190A65C15F22A6B3E38F20724035F005" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_5D53EA084E7ECD6F5FB220724035D1FF" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_190A65C15F22A6B3E38F20724035F005" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleOfFairValueOfUKPlanAssetsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_96C14C00D15BA13B85042072404348FD" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_96C14C00D15BA13B85042072404348FD" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_67EB6CC37C829DC35DCA20724044789F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_67EB6CC37C829DC35DCA20724044789F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_B8E47878B0DB3A96447620724044FFCE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_67EB6CC37C829DC35DCA20724044789F" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_B8E47878B0DB3A96447620724044FFCE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_6D691A68768A57DE020620724044969B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_B8E47878B0DB3A96447620724044FFCE" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_6D691A68768A57DE020620724044969B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_27CDFA34A650D251BEC520724045A677" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_27CDFA34A650D251BEC520724045A677" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_EF6B93EB0A10272BF1E22072404578D4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_27CDFA34A650D251BEC520724045A677" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_EF6B93EB0A10272BF1E22072404578D4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_89CCB0318D9C733E139D207240455494" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_EF6B93EB0A10272BF1E22072404578D4" xlink:to="loc_us-gaap_ForeignPlanMember_89CCB0318D9C733E139D207240455494" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_5C637B044C378ECA1F5720724045F268" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_89CCB0318D9C733E139D207240455494" xlink:to="loc_country_GB_5C637B044C378ECA1F5720724045F268" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_75002DC9C3CAE7ED4E0B207240460F82" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_75002DC9C3CAE7ED4E0B207240460F82" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_AB44E20D0218DD67DA6C207240463622" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_75002DC9C3CAE7ED4E0B207240460F82" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_AB44E20D0218DD67DA6C207240463622" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_41394547C0B9816FCB25207240460840" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_AB44E20D0218DD67DA6C207240463622" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_41394547C0B9816FCB25207240460840" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_80BF26730F5CC1DFA50D207240466346" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_AB44E20D0218DD67DA6C207240463622" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_80BF26730F5CC1DFA50D207240466346" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_F919300A49B6EC7EDC8320724047CF2B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_AB44E20D0218DD67DA6C207240463622" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_F919300A49B6EC7EDC8320724047CF2B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0115B246C97E08C37CB6207240474B31" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0115B246C97E08C37CB6207240474B31" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0115B246C97E08C37CB6207240474B31" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_4A17D503EC41059257A3207240474FF1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_4A17D503EC41059257A3207240474FF1" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EquityInvestmentsPooledFundsMember" xlink:label="loc_aon_EquityInvestmentsPooledFundsMember_C18AA075E1E397B9056D20724047D151" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_aon_EquityInvestmentsPooledFundsMember_C18AA075E1E397B9056D20724047D151" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDerivativeMember" xlink:label="loc_us-gaap_DefinedBenefitPlanDerivativeMember_5CE5EC6E5498AB11880920724048A416" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_us-gaap_DefinedBenefitPlanDerivativeMember_5CE5EC6E5498AB11880920724048A416" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_EB876DD0B46BD69EDE97207240483CB5" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_EB876DD0B46BD69EDE97207240483CB5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_GovernmentAndAgencyBondsMember" xlink:label="loc_aon_GovernmentAndAgencyBondsMember_FCBDF0F4CE3B64FDBF9F20724048EA5E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_aon_GovernmentAndAgencyBondsMember_FCBDF0F4CE3B64FDBF9F20724048EA5E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AnnuitiesMember" xlink:label="loc_aon_AnnuitiesMember_1CEC37B19A8DCE26E02D20724048E27E" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_aon_AnnuitiesMember_1CEC37B19A8DCE26E02D20724048E27E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FixedIncomeInvestmentsPooledFundsMember" xlink:label="loc_aon_FixedIncomeInvestmentsPooledFundsMember_25526ED8D2B8A40B5EE7207240483A64" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_aon_FixedIncomeInvestmentsPooledFundsMember_25526ED8D2B8A40B5EE7207240483A64" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RealEstateAndRealEstateInvestmentTrustMember" xlink:label="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_C353F5165789DACB032F2072404814CD" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_C353F5165789DACB032F2072404814CD" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AlternativeInvestmentsMember" xlink:label="loc_aon_AlternativeInvestmentsMember_440EC034BD4ACC00628C207240484573" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_C3E6484362EE37E991DF2072404793DC" xlink:to="loc_aon_AlternativeInvestmentsMember_440EC034BD4ACC00628C207240484573" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_48B5C6C93874F4D2C2B0207240493CEA" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4C39C2AB473AA88E8853207240443A3F" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_48B5C6C93874F4D2C2B0207240493CEA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_81AD474DB2F9F03449EC20724049B2AE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_48B5C6C93874F4D2C2B0207240493CEA" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_81AD474DB2F9F03449EC20724049B2AE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleOfFairValueOfUSPlanAssetsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_EE882F8CE56F0B34DBE22A57DFCC1E7F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_EE882F8CE56F0B34DBE22A57DFCC1E7F" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_B7BF92428D1D75F4139B2A57DFCC4EF7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_B7BF92428D1D75F4139B2A57DFCC4EF7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_B56B72EB61960E7614F62A57DFCC84BA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_B7BF92428D1D75F4139B2A57DFCC4EF7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_B56B72EB61960E7614F62A57DFCC84BA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_3F8FD890821CE5A8F0202A57DFCC57D8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_B56B72EB61960E7614F62A57DFCC84BA" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_3F8FD890821CE5A8F0202A57DFCC57D8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_0C8D79B34C7D2F599C4C2A57DFCC9F42" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_0C8D79B34C7D2F599C4C2A57DFCC9F42" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_0BCD86FCCEB006A918BC2A57DFCC9668" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_0C8D79B34C7D2F599C4C2A57DFCC9F42" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_0BCD86FCCEB006A918BC2A57DFCC9668" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_A9765CB702F6EEB85E7C2A57DFCC43C0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_0BCD86FCCEB006A918BC2A57DFCC9668" xlink:to="loc_us-gaap_DomesticPlanMember_A9765CB702F6EEB85E7C2A57DFCC43C0" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_0F097FBBAA12D5F157842A57DFCCCF63" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_A9765CB702F6EEB85E7C2A57DFCC43C0" xlink:to="loc_country_US_0F097FBBAA12D5F157842A57DFCCCF63" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_48F5CAE188371AC97D8E2A57DFCCCF87" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_48F5CAE188371AC97D8E2A57DFCCCF87" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_42D1C942CDE9226C98E52A57DFCCFB5B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_48F5CAE188371AC97D8E2A57DFCCCF87" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_42D1C942CDE9226C98E52A57DFCCFB5B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_2EDA2959946A8BF36CE22A57DFCCC580" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_42D1C942CDE9226C98E52A57DFCCFB5B" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_2EDA2959946A8BF36CE22A57DFCCC580" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_78999F76AC51ACB29BDF2A57DFCC21D5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_42D1C942CDE9226C98E52A57DFCCFB5B" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_78999F76AC51ACB29BDF2A57DFCC21D5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_BD45B749424D1CD5A0EB2A57DFCCBD59" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_42D1C942CDE9226C98E52A57DFCCFB5B" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_BD45B749424D1CD5A0EB2A57DFCCBD59" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_01CF49A19167BC919B392A57DFCC60C5" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_01CF49A19167BC919B392A57DFCC60C5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_01CF49A19167BC919B392A57DFCC60C5" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1246F563A213EAE373D22A57DFCCD9EB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1246F563A213EAE373D22A57DFCCD9EB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_15BF2E1A3666CF25083E2A7BE009B497" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_15BF2E1A3666CF25083E2A7BE009B497" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EquityDerivativeMember" xlink:label="loc_aon_EquityDerivativeMember_0907FE367C9CF642D1A62A57DFCC6AFB" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_aon_EquityDerivativeMember_0907FE367C9CF642D1A62A57DFCC6AFB" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EquityInvestmentsPooledFundsMember" xlink:label="loc_aon_EquityInvestmentsPooledFundsMember_DE7CFB3CF2ACB9DB430C2A57DFCC4EE4" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_aon_EquityInvestmentsPooledFundsMember_DE7CFB3CF2ACB9DB430C2A57DFCC4EE4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_2F788CAD89A9C3957F132A57DFCCD606" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_2F788CAD89A9C3957F132A57DFCCD606" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_GovernmentAndAgencyBondsMember" xlink:label="loc_aon_GovernmentAndAgencyBondsMember_09368CC5790F1E2246CF2A57DFCC6C6A" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_aon_GovernmentAndAgencyBondsMember_09368CC5790F1E2246CF2A57DFCC6C6A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetBackedSecuritiesMember" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_D3112527A1986BC0A6912A57DFCC3BC9" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_D3112527A1986BC0A6912A57DFCC3BC9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FixedIncomeInvestmentsPooledFundsMember" xlink:label="loc_aon_FixedIncomeInvestmentsPooledFundsMember_697A3803B3338DE512ED2A57DFCC33CE" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_aon_FixedIncomeInvestmentsPooledFundsMember_697A3803B3338DE512ED2A57DFCC33CE" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RealEstateAndRealEstateInvestmentTrustMember" xlink:label="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_3883C8BBE28C20336C802A57DFCC4144" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_3883C8BBE28C20336C802A57DFCC4144" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AlternativeInvestmentsMember" xlink:label="loc_aon_AlternativeInvestmentsMember_5A567D9EC2773E4BE0662A57DFCC4B62" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_13DD7C50F3D824D1D3ED2A57DFCC9876" xlink:to="loc_aon_AlternativeInvestmentsMember_5A567D9EC2773E4BE0662A57DFCC4B62" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_BF9A86141C207F48379B2A57DFCC69D0" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_F1084F001863772952352A57DFCC3B4B" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_BF9A86141C207F48379B2A57DFCC69D0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_0FCA4EEFBE600D398E5E2A57DFCCDE41" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_BF9A86141C207F48379B2A57DFCC69D0" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_0FCA4EEFBE600D398E5E2A57DFCCDE41" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleOfOtherInformationRelatedToCompanysOtherPostRetirementPlansDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6D3BA7EE547F7239771020B17B796866" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_EE13502FE34541C637B220B17B7A876F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6D3BA7EE547F7239771020B17B796866" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_EE13502FE34541C637B220B17B7A876F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_960E734093F2F2C3BFE320B17B7A58F0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_EE13502FE34541C637B220B17B7A876F" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_960E734093F2F2C3BFE320B17B7A58F0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_72A6BAE174D07D813C9B20B17B7A9C9E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_960E734093F2F2C3BFE320B17B7A58F0" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_72A6BAE174D07D813C9B20B17B7A9C9E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_6C4BE4495B7A7F93D10020B17B7BEE19" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_72A6BAE174D07D813C9B20B17B7A9C9E" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_6C4BE4495B7A7F93D10020B17B7BEE19" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_F6C05790F3C0AC49DC0120B17B7B884F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_EE13502FE34541C637B220B17B7A876F" xlink:to="loc_srt_RangeAxis_F6C05790F3C0AC49DC0120B17B7B884F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_217C389EAF067784628C20B17B7C78F9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_F6C05790F3C0AC49DC0120B17B7B884F" xlink:to="loc_srt_RangeMember_217C389EAF067784628C20B17B7C78F9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_D76A37EE9314E8E45C5020B17B7C9C14" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_217C389EAF067784628C20B17B7C78F9" xlink:to="loc_srt_MinimumMember_D76A37EE9314E8E45C5020B17B7C9C14" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_002C70DCBF56BFCF00D720B17B7C29BB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_217C389EAF067784628C20B17B7C78F9" xlink:to="loc_srt_MaximumMember_002C70DCBF56BFCF00D720B17B7C29BB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A8A0BFBFA5C3A04966A220B17B7CB279" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_EE13502FE34541C637B220B17B7A876F" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A8A0BFBFA5C3A04966A220B17B7CB279" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_99BBE5846980CDB8A2E820B17B7D030A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A8A0BFBFA5C3A04966A220B17B7CB279" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_99BBE5846980CDB8A2E820B17B7D030A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_738DAA8EE500F756083420B17B7DC6DB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A8A0BFBFA5C3A04966A220B17B7CB279" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_738DAA8EE500F756083420B17B7DC6DB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_4ED1F249077A90B82EA520B17B7DDE73" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A8A0BFBFA5C3A04966A220B17B7CB279" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_4ED1F249077A90B82EA520B17B7DDE73" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock_FA728F8747A8A64D8A2B1550F54B0E1E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock_FA728F8747A8A64D8A2B1550F54B0E1E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock" xlink:label="loc_us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock_35C8AE6A6901DFB049DB156497D865E0" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock_35C8AE6A6901DFB049DB156497D865E0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_D526A1E4A37ED395EAD41550F54B5F4E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_D526A1E4A37ED395EAD41550F54B5F4E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock_63F661473EFFE6410E641550F54BAD89" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock_63F661473EFFE6410E641550F54BAD89" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_E83857A81EC3A086B9D61550F54B80C8" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_E83857A81EC3A086B9D61550F54B80C8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAssumptionsUsedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_C5B9CCCDDC583331E60F1550F54B477A" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_C5B9CCCDDC583331E60F1550F54B477A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock_88CB5E102BCA3A88E0D11550F54B258F" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock_88CB5E102BCA3A88E0D11550F54B258F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock_BA32450348B450C0BC991550F54B16AE" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock_BA32450348B450C0BC991550F54B16AE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_F354E00CF1175A03763C1550F54B4404" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_F354E00CF1175A03763C1550F54B4404" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ScheduleOfOtherPostretirementBenefitsOtherInformationTableTextBlock" xlink:label="loc_aon_ScheduleOfOtherPostretirementBenefitsOtherInformationTableTextBlock_96E1DA524E3984EC76051550F54BC6CC" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_06FBA620AC01786910921550F54B5853" xlink:to="loc_aon_ScheduleOfOtherPostretirementBenefitsOtherInformationTableTextBlock_96E1DA524E3984EC76051550F54BC6CC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsUSAndCanadianOtherPostRetirementBenefitsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D4D87999E9DB41E09EDE20B17B65C34F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_6B7EA8CC287D2FA7F3CE20B17B66772F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D4D87999E9DB41E09EDE20B17B65C34F" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_6B7EA8CC287D2FA7F3CE20B17B66772F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_9CD95F3CDE1AC81EC90320B17B66CFE3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_6B7EA8CC287D2FA7F3CE20B17B66772F" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_9CD95F3CDE1AC81EC90320B17B66CFE3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_F2C60068E1FCB654B51020B17B672A1F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9CD95F3CDE1AC81EC90320B17B66CFE3" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_F2C60068E1FCB654B51020B17B672A1F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_7832743752345F36193E20B17B67124F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_F2C60068E1FCB654B51020B17B672A1F" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_7832743752345F36193E20B17B67124F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_C138E11C5A9CE793D81B20B17B685F43" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_6B7EA8CC287D2FA7F3CE20B17B66772F" xlink:to="loc_srt_RangeAxis_C138E11C5A9CE793D81B20B17B685F43" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_ABDF2CC0471F2E1FA75720B17B68E840" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_C138E11C5A9CE793D81B20B17B685F43" xlink:to="loc_srt_RangeMember_ABDF2CC0471F2E1FA75720B17B68E840" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_0EDFF455C407A4613C1F20B17B6848E9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_ABDF2CC0471F2E1FA75720B17B68E840" xlink:to="loc_srt_MaximumMember_0EDFF455C407A4613C1F20B17B6848E9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_EED72943F8EA3185E99F20B17B68AF6A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_ABDF2CC0471F2E1FA75720B17B68E840" xlink:to="loc_srt_MinimumMember_EED72943F8EA3185E99F20B17B68AF6A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_6B7EA8CC287D2FA7F3CE20B17B66772F" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_DB47222BECD031A5098F20B17B699EE8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_DB47222BECD031A5098F20B17B699EE8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_08B7A6CA8DD05C147D2B20B17B6AF536" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_08B7A6CA8DD05C147D2B20B17B6AF536" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_D24C21D88E8B061CBB8D20B17B6A56BA" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_D24C21D88E8B061CBB8D20B17B6A56BA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_23F4F0B97287F3855A0820B17B6AFD83" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_23F4F0B97287F3855A0820B17B6AFD83" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_6A306BB06D0181B7D0B720B17B6A0091" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_6A306BB06D0181B7D0B720B17B6A0091" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_BF0B1E60EEB89033138C20B17B6A6035" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_BF0B1E60EEB89033138C20B17B6A6035" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_FB42896832955928AED320B17B6C6258" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_FB42896832955928AED320B17B6C6258" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan" xlink:label="loc_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods" xlink:label="loc_aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods_585B8707F5206A02D2B220B17B6DC0D9" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_BCE2AA29609EFA86EEC620B17B696FB7" xlink:to="loc_aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods_585B8707F5206A02D2B220B17B6DC0D9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsWeightedAverageAssumptionsUsedToDetermineFutureBenefitObligationsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6FE0E4F0E4E98F4B3B86021EF6F3DAFD" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_C7CE2FA47AAB071DE494021EF6F39D03" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6FE0E4F0E4E98F4B3B86021EF6F3DAFD" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_C7CE2FA47AAB071DE494021EF6F39D03" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_8A7DDC980B9C6123FE85021EF6F390E2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_C7CE2FA47AAB071DE494021EF6F39D03" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_8A7DDC980B9C6123FE85021EF6F390E2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_C2CA03FCEA76484077BE021EF6F47AE3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_8A7DDC980B9C6123FE85021EF6F390E2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_C2CA03FCEA76484077BE021EF6F47AE3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_24641E1ACB7D3E8364DF021EF6F40701" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_C2CA03FCEA76484077BE021EF6F47AE3" xlink:to="loc_us-gaap_DomesticPlanMember_24641E1ACB7D3E8364DF021EF6F40701" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_99F5CBEA40632582567E021EF6F47335" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_24641E1ACB7D3E8364DF021EF6F40701" xlink:to="loc_country_US_99F5CBEA40632582567E021EF6F47335" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_0F4717EA10B33728413A021EF6F5BCA6" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_C2CA03FCEA76484077BE021EF6F47AE3" xlink:to="loc_us-gaap_ForeignPlanMember_0F4717EA10B33728413A021EF6F5BCA6" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_468FF674A5B91A164992021EF6F5BEFC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_0F4717EA10B33728413A021EF6F5BCA6" xlink:to="loc_country_GB_468FF674A5B91A164992021EF6F5BEFC" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_586852E552D6ADF1A882021EF6F5C2D7" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_0F4717EA10B33728413A021EF6F5BCA6" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_586852E552D6ADF1A882021EF6F5C2D7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_7A51BB52979E9F9F574C021EF6F5B9F5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_C7CE2FA47AAB071DE494021EF6F39D03" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_7A51BB52979E9F9F574C021EF6F5B9F5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3F9D2516510466FEC198021EF6F52DD5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_7A51BB52979E9F9F574C021EF6F5B9F5" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3F9D2516510466FEC198021EF6F52DD5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_6B17B101826D663BFB7B021EF6F69821" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3F9D2516510466FEC198021EF6F52DD5" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_6B17B101826D663BFB7B021EF6F69821" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_29FD905DD2B5B40FBFDB021EF6F65A2A" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_C7CE2FA47AAB071DE494021EF6F39D03" xlink:to="loc_srt_RangeAxis_29FD905DD2B5B40FBFDB021EF6F65A2A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_C6144546CCD0879B6F69021EF6F6672B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_29FD905DD2B5B40FBFDB021EF6F65A2A" xlink:to="loc_srt_RangeMember_C6144546CCD0879B6F69021EF6F6672B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_9DCDD02572E03516359E021EF6F7391D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_C6144546CCD0879B6F69021EF6F6672B" xlink:to="loc_srt_MinimumMember_9DCDD02572E03516359E021EF6F7391D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_2D553000173F78C99ED9021EF6F71832" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_C6144546CCD0879B6F69021EF6F6672B" xlink:to="loc_srt_MaximumMember_2D553000173F78C99ED9021EF6F71832" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A06B8B7DF753FFAD1B6F021EF6F7D896" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_C7CE2FA47AAB071DE494021EF6F39D03" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A06B8B7DF753FFAD1B6F021EF6F7D896" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_575779FAE49D3937C5A4021EF6F720C7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A06B8B7DF753FFAD1B6F021EF6F7D896" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_575779FAE49D3937C5A4021EF6F720C7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_545E89D53176114A152D021EF6F73836" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A06B8B7DF753FFAD1B6F021EF6F7D896" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_545E89D53176114A152D021EF6F73836" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation" xlink:label="loc_aon_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation_04C708014AA5A3C9EDA2021EF6F884AF" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_A06B8B7DF753FFAD1B6F021EF6F7D896" xlink:to="loc_aon_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation_04C708014AA5A3C9EDA2021EF6F884AF" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_C10D92548F0F8A6297F8021EF6E94CC3" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_1105C91505A88730D1EC021EF6E97514" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_C10D92548F0F8A6297F8021EF6E94CC3" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_1105C91505A88730D1EC021EF6E97514" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_F2940A7C871F87203E06021EF6E9A8AA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_1105C91505A88730D1EC021EF6E97514" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_F2940A7C871F87203E06021EF6E9A8AA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_E2225CB048E14D83B182021EF6EA49AA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_F2940A7C871F87203E06021EF6E9A8AA" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_E2225CB048E14D83B182021EF6EA49AA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticPlanMember" xlink:label="loc_us-gaap_DomesticPlanMember_EBA4028AD6FC2D68222D021EF6EAF6E8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_E2225CB048E14D83B182021EF6EA49AA" xlink:to="loc_us-gaap_DomesticPlanMember_EBA4028AD6FC2D68222D021EF6EAF6E8" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_9CFD2BCFED166346556E021EF6EA7A7C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_EBA4028AD6FC2D68222D021EF6EAF6E8" xlink:to="loc_country_US_9CFD2BCFED166346556E021EF6EA7A7C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_ECA7B524963E70247763021EF6EA005A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_E2225CB048E14D83B182021EF6EA49AA" xlink:to="loc_us-gaap_ForeignPlanMember_ECA7B524963E70247763021EF6EA005A" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_688F29ADC7CB6F85A65C021EF6EA52FF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_ECA7B524963E70247763021EF6EA005A" xlink:to="loc_country_GB_688F29ADC7CB6F85A65C021EF6EA52FF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TheNetherlandsAndCanadaMember" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_D46DF2BA3F15B4FA633F021EF6EBE7BF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_ECA7B524963E70247763021EF6EA005A" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_D46DF2BA3F15B4FA633F021EF6EBE7BF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_D555BD2688C89AE6C08F021EF6EB0856" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_1105C91505A88730D1EC021EF6E97514" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_D555BD2688C89AE6C08F021EF6EB0856" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_2BBD658E0CEF46B5C389021EF6EB5619" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_D555BD2688C89AE6C08F021EF6EB0856" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_2BBD658E0CEF46B5C389021EF6EB5619" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_4A7247CD881E9BE25C29021EF6EC40B0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_2BBD658E0CEF46B5C389021EF6EB5619" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_4A7247CD881E9BE25C29021EF6EC40B0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_133B0F3B2C27431B0ADA021EF6EC16D8" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_1105C91505A88730D1EC021EF6E97514" xlink:to="loc_srt_RangeAxis_133B0F3B2C27431B0ADA021EF6EC16D8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_EBC02636BAE876A33AE2021EF6EC96AC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_133B0F3B2C27431B0ADA021EF6EC16D8" xlink:to="loc_srt_RangeMember_EBC02636BAE876A33AE2021EF6EC96AC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_CF743B7CF8A878D870DA021EF6EC63C2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_EBC02636BAE876A33AE2021EF6EC96AC" xlink:to="loc_srt_MinimumMember_CF743B7CF8A878D870DA021EF6EC63C2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_67829BD8B90A70863B98021EF6EC585E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_EBC02636BAE876A33AE2021EF6EC96AC" xlink:to="loc_srt_MaximumMember_67829BD8B90A70863B98021EF6EC585E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_404686D959E24457C031021EF6EDBE4E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_1105C91505A88730D1EC021EF6E97514" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_404686D959E24457C031021EF6EDBE4E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_F59C72A51E091D37A9AD021EF6EDF9D7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_404686D959E24457C031021EF6EDBE4E" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_F59C72A51E091D37A9AD021EF6EDF9D7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_5A5F2B57120847313D67021EF6EDA661" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_404686D959E24457C031021EF6EDBE4E" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_5A5F2B57120847313D67021EF6EDA661" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_A0AAEE364F3E766F0058021EF6ED8000" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_404686D959E24457C031021EF6EDBE4E" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_A0AAEE364F3E766F0058021EF6ED8000" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstruments" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_357E18E5C536982A611BD74868456EEE" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_044B9A20DAB70AE97F84D7486854B2A6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_357E18E5C536982A611BD74868456EEE" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_044B9A20DAB70AE97F84D7486854B2A6" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_2EE072A2892F3F825840FC22E1902A43" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_37D1D446694AA643022AFC22E1929B9F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_2EE072A2892F3F825840FC22E1902A43" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_37D1D446694AA643022AFC22E1929B9F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsScheduleOfAssetsAndLiabilitiesThatAreMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_5D7DA7926BEF181967C6DC57660D1A7F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_5D7DA7926BEF181967C6DC57660D1A7F" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_86EC7BE6A2B27A930EFFDC57660E21E4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_86EC7BE6A2B27A930EFFDC57660E21E4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_4AFAE9F77739CA1682BADC57660ED962" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_86EC7BE6A2B27A930EFFDC57660E21E4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_4AFAE9F77739CA1682BADC57660ED962" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_774856D86421E739766FDC57660EE935" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_4AFAE9F77739CA1682BADC57660ED962" xlink:to="loc_us-gaap_ForeignExchangeContractMember_774856D86421E739766FDC57660EE935" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D1D6346AE1AE26630D00DC57660F36E4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D1D6346AE1AE26630D00DC57660F36E4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_376130BC376FF439FBCFDC57660F27BA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D1D6346AE1AE26630D00DC57660F36E4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_376130BC376FF439FBCFDC57660F27BA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_F031D82BC1D63BFC34DBDC57660F0CB0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_376130BC376FF439FBCFDC57660F27BA" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_F031D82BC1D63BFC34DBDC57660F0CB0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_840096B9D0FD2519A511DC5766106669" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_376130BC376FF439FBCFDC57660F27BA" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_840096B9D0FD2519A511DC5766106669" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_5E95B35A10B127E189DADC5766100ACC" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_376130BC376FF439FBCFDC57660F27BA" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_5E95B35A10B127E189DADC5766100ACC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_9F248ED0E21A7DA91711DC5766100BAA" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:to="loc_us-gaap_FinancialInstrumentAxis_9F248ED0E21A7DA91711DC5766100BAA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_063CC3506E15E9C5DD15DC57B3FE6B67" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_9F248ED0E21A7DA91711DC5766100BAA" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_063CC3506E15E9C5DD15DC57B3FE6B67" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember" xlink:label="loc_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_6654404C2507C9BBCB28DC5766108A18" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_063CC3506E15E9C5DD15DC57B3FE6B67" xlink:to="loc_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_6654404C2507C9BBCB28DC5766108A18" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_GovernmentBondSecuritiesMember" xlink:label="loc_aon_GovernmentBondSecuritiesMember_2686CBF6CE0506D633A8DC5766117112" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_063CC3506E15E9C5DD15DC57B3FE6B67" xlink:to="loc_aon_GovernmentBondSecuritiesMember_2686CBF6CE0506D633A8DC5766117112" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_18A5ECCACF0AB39066EBDC5766110024" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_063CC3506E15E9C5DD15DC57B3FE6B67" xlink:to="loc_us-gaap_EquitySecuritiesMember_18A5ECCACF0AB39066EBDC5766110024" xlink:type="arc"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_063CC3506E15E9C5DD15DC57B3FE6B67" xlink:to="loc_us-gaap_ForeignExchangeContractMember_774856D86421E739766FDC57660EE935" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_D3BD787FEAB6C15F7864DC5766114331" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_D3BD787FEAB6C15F7864DC5766114331" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_D3BD787FEAB6C15F7864DC5766114331" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C2172419F6E5291433B1DC57660E73B1" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure" xlink:label="loc_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:to="loc_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherInvestments" xlink:label="loc_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:to="loc_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:to="loc_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_CCE299FE834482D36D89DC576613ADA6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E" xlink:to="loc_us-gaap_DerivativeLiabilities_CCE299FE834482D36D89DC576613ADA6" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsScheduleOfFinancialInstrumentsWhereCarryingAmountsAndFairValuesDifferDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_728523D7894A72E616B39790FA441A1C" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_B8A02D596E5DEA9265119790FA44AB69" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_728523D7894A72E616B39790FA441A1C" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_B8A02D596E5DEA9265119790FA44AB69" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuredDebtCurrent" xlink:label="loc_us-gaap_SecuredDebtCurrent_73F15A3D4F53FA56E5C89790FA44C4A5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_B8A02D596E5DEA9265119790FA44AB69" xlink:to="loc_us-gaap_SecuredDebtCurrent_73F15A3D4F53FA56E5C89790FA44C4A5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShorttermDebtFairValue" xlink:label="loc_us-gaap_ShorttermDebtFairValue_DCA46F36C6760A1B57D79790FA44BEAA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_B8A02D596E5DEA9265119790FA44AB69" xlink:to="loc_us-gaap_ShorttermDebtFairValue_DCA46F36C6760A1B57D79790FA44BEAA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_F8DEF3B123F918700F509790FA4421C9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_B8A02D596E5DEA9265119790FA44AB69" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_F8DEF3B123F918700F509790FA4421C9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_F8C6104B431595ECC4C19790FA450359" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_B8A02D596E5DEA9265119790FA44AB69" xlink:to="loc_us-gaap_LongTermDebtFairValue_F8C6104B431595ECC4C19790FA450359" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsAndFinancialInstrumentsTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_891ADAFABFFBC2F07FB2D74869BC5C2A" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_891ADAFABFFBC2F07FB2D74869BC5C2A" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTextBlock" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_891ADAFABFFBC2F07FB2D74869BC5C2A" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GoodwillAndOtherIntangibleAssets" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BCE8EEFFFD53D5B1BA55D7486B14E440" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_4EA6CCCDF583BE195B76D7486B15AE3F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BCE8EEFFFD53D5B1BA55D7486B14E440" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_4EA6CCCDF583BE195B76D7486B15AE3F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfChangesInNetCarryingAmountOfGoodwillDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759" xlink:to="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="loc_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="loc_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfEstimatedFutureAmortizationExpenseOnIntangibleAssetsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_69FA40442380678F7472925B6EE0EF0A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_69FA40442380678F7472925B6EE0EF0A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_16C86E41CCCF820A4AEF925B6EE03777" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_16C86E41CCCF820A4AEF925B6EE03777" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BDA175009E0D48CE0D72925B6EE00E33" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BDA175009E0D48CE0D72925B6EE00E33" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BBB929142FFBF88E3D6925B6EE059A3" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BBB929142FFBF88E3D6925B6EE059A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_30D07D0672CE3C731547925B6EE143B4" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_30D07D0672CE3C731547925B6EE143B4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_4FF971E632069D03DEC9925B6EE1EAFF" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_4FF971E632069D03DEC9925B6EE1EAFF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2703BDE8792B31C6B3F2925B6EE1D205" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BDDBD4A4D2F1931732D3925B6EDF29ED" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2703BDE8792B31C6B3F2925B6EE1D205" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfOtherIntangibleAssetsByAssetClassDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_F6D5CC964561531EBD17021EF83576DA" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_C40D54EBE5E419101C43021EF835099D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_F6D5CC964561531EBD17021EF83576DA" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_C40D54EBE5E419101C43021EF835099D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A3D0DD37C7FEEBD6DCF1021EF8356BE0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_C40D54EBE5E419101C43021EF835099D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A3D0DD37C7FEEBD6DCF1021EF8356BE0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_785E7C66E8F7D9081D0D021EF8358325" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_A3D0DD37C7FEEBD6DCF1021EF8356BE0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_785E7C66E8F7D9081D0D021EF8358325" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CustomerRelatedAndContractBasedMember" xlink:label="loc_aon_CustomerRelatedAndContractBasedMember_D3348BC739AEB33ED35D021EF83648E3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_785E7C66E8F7D9081D0D021EF8358325" xlink:to="loc_aon_CustomerRelatedAndContractBasedMember_D3348BC739AEB33ED35D021EF83648E3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_53141462D934770E3DAE021EF836EA48" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_785E7C66E8F7D9081D0D021EF8358325" xlink:to="loc_us-gaap_TradeNamesMember_53141462D934770E3DAE021EF836EA48" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_MarketingTechnologyAndOtherMember" xlink:label="loc_aon_MarketingTechnologyAndOtherMember_32CF7C8BCE3C37B51FCC021EF836FB61" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_785E7C66E8F7D9081D0D021EF8358325" xlink:to="loc_aon_MarketingTechnologyAndOtherMember_32CF7C8BCE3C37B51FCC021EF836FB61" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_88718838F890C8A6EEF4021EF836D53D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_C40D54EBE5E419101C43021EF835099D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_88718838F890C8A6EEF4021EF836D53D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_228AF39B6C37993C75D5021EF836D9D6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_88718838F890C8A6EEF4021EF836D53D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_228AF39B6C37993C75D5021EF836D9D6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_6C83A5750A1525BBDF31021EF837E631" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_88718838F890C8A6EEF4021EF836D53D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_6C83A5750A1525BBDF31021EF837E631" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_A854002A07CDDC4C6F87021EF837A43E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_88718838F890C8A6EEF4021EF836D53D" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_A854002A07CDDC4C6F87021EF837A43E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssets" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_22BA236D67971041A811023BB776A718" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_88718838F890C8A6EEF4021EF836D53D" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_22BA236D67971041A811023BB776A718" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_B420E693744FA1799B38FC7EF393E270" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock" xlink:label="loc_us-gaap_ScheduleOfGoodwillTextBlock_B381B70AE939F4936A22FC7EF393FA3F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_B420E693744FA1799B38FC7EF393E270" xlink:to="loc_us-gaap_ScheduleOfGoodwillTextBlock_B381B70AE939F4936A22FC7EF393FA3F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_06503D35271BB2F7D8DCFC8B8DDEAE67" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_B420E693744FA1799B38FC7EF393E270" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_06503D35271BB2F7D8DCFC8B8DDEAE67" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_A6BD04D116FE1182991BFC7EF394EB18" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_B420E693744FA1799B38FC7EF393E270" xlink:to="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_A6BD04D116FE1182991BFC7EF394EB18" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecurities" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_CondensedFinancialStatementsDisclosureAbstract" xlink:label="loc_aon_CondensedFinancialStatementsDisclosureAbstract_FDAF8D874021B7811842D74868D1D954" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedFinancialStatementsTextBlock" xlink:label="loc_srt_CondensedFinancialStatementsTextBlock_C653C8C8B974F675D7A9D74868D15BA4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_FDAF8D874021B7811842D74868D1D954" xlink:to="loc_srt_CondensedFinancialStatementsTextBlock_C653C8C8B974F675D7A9D74868D15BA4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfCashFlowsDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_CondensedFinancialStatementsDisclosureAbstract" xlink:label="loc_aon_CondensedFinancialStatementsDisclosureAbstract_EF78C86FB97F84C9993620325442A284" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_BCCDC3E5CAB9D5EA240220325443374F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_EF78C86FB97F84C9993620325442A284" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_BCCDC3E5CAB9D5EA240220325443374F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_7132F6F1F9D7D2347C9620325443B319" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_BCCDC3E5CAB9D5EA240220325443374F" xlink:to="loc_srt_ConsolidationItemsAxis_7132F6F1F9D7D2347C9620325443B319" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_67E5343A093C619483B320325443B6D1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_7132F6F1F9D7D2347C9620325443B319" xlink:to="loc_srt_ConsolidationItemsDomain_67E5343A093C619483B320325443B6D1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationEliminationsMember" xlink:label="loc_srt_ConsolidationEliminationsMember_22C1B6ABE24DDB184140203254446DEE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_67E5343A093C619483B320325443B6D1" xlink:to="loc_srt_ConsolidationEliminationsMember_22C1B6ABE24DDB184140203254446DEE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_2190E0486AF9508ADBD320325444D524" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_BCCDC3E5CAB9D5EA240220325443374F" xlink:to="loc_srt_ConsolidatedEntitiesAxis_2190E0486AF9508ADBD320325444D524" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_ACD123C2C679304037B2203254450E8F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesAxis_2190E0486AF9508ADBD320325444D524" xlink:to="loc_srt_ConsolidatedEntitiesDomain_ACD123C2C679304037B2203254450E8F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_88E5B5CB4D995AD9FDBC203254456EE0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_ACD123C2C679304037B2203254450E8F" xlink:to="loc_srt_ParentCompanyMember_88E5B5CB4D995AD9FDBC203254456EE0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_GuarantorSubsidiariesMember" xlink:label="loc_srt_GuarantorSubsidiariesMember_8C7E93B7843D7A6A17AE2032544A72B9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_ACD123C2C679304037B2203254450E8F" xlink:to="loc_srt_GuarantorSubsidiariesMember_8C7E93B7843D7A6A17AE2032544A72B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NonGuarantorSubsidiariesMember" xlink:label="loc_srt_NonGuarantorSubsidiariesMember_364C5FDD14B71CD7A6F82032544BBDBE" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_ACD123C2C679304037B2203254450E8F" xlink:to="loc_srt_NonGuarantorSubsidiariesMember_364C5FDD14B71CD7A6F82032544BBDBE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_BCCDC3E5CAB9D5EA240220325443374F" xlink:to="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BE341850161A12440CDC2032544BD86E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BE341850161A12440CDC2032544BD86E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_97A34B126ECEDFE0F5142032544B1E7B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BE341850161A12440CDC2032544BD86E" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_97A34B126ECEDFE0F5142032544B1E7B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_0075FA2DD5AE6A8006782032544CC145" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BE341850161A12440CDC2032544BD86E" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_0075FA2DD5AE6A8006782032544CC145" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_54D6EFAF9ECC7DE057AE2032544CE2C6" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BE341850161A12440CDC2032544BD86E" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_54D6EFAF9ECC7DE057AE2032544CE2C6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_3453220C9569E71641E32032544D6F79" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_3453220C9569E71641E32032544D6F79" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireOtherInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireOtherInvestments_A77CDDBBD7625887905F2032544D3C94" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_PaymentsToAcquireOtherInvestments_A77CDDBBD7625887905F2032544D3C94" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_PaymentsForProceedsFromMarketableSecurities" xlink:label="loc_aon_PaymentsForProceedsFromMarketableSecurities_D0947BCAAE4A35C131242032544DAD69" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_aon_PaymentsForProceedsFromMarketableSecurities_D0947BCAAE4A35C131242032544DAD69" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8217183B6102069C35AB2032544E66E0" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8217183B6102069C35AB2032544E66E0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_4D67470CA46CCBF42BBF2032544E649B" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_4D67470CA46CCBF42BBF2032544E649B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D6B5AA40B7E17FEB07F92032544EFCDC" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D6B5AA40B7E17FEB07F92032544EFCDC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_719E285B081060DC1EE22032544F2392" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_719E285B081060DC1EE22032544F2392" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_CA0C7BC729B48197F4102032544F684B" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_CA0C7BC729B48197F4102032544F684B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_B9CFADAEE33B27991C0F2032544F2B0D" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3155AE35ECFEF4A1B6C42032544DF1C6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_B9CFADAEE33B27991C0F2032544F2B0D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquity" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_84F1357D25AD143F36492032544F543A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_84F1357D25AD143F36492032544F543A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDueToAffiliates" xlink:label="loc_us-gaap_IncreaseDecreaseInDueToAffiliates_3B8BAC027524D260457C2032545015C5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_IncreaseDecreaseInDueToAffiliates_3B8BAC027524D260457C2032545015C5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_4C3F7A869356C2878884203254502BA4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_4C3F7A869356C2878884203254502BA4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_921C035EEB678AAA30A320325450F0D3" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_921C035EEB678AAA30A320325450F0D3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_301CCC0A580DDE99A18E20325451DA5A" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_301CCC0A580DDE99A18E20325451DA5A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_48BC10537E7C136EB0B0203254515146" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_48BC10537E7C136EB0B0203254515146" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_DB02E653201AE9F76FE120325451D1CB" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_DB02E653201AE9F76FE120325451D1CB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_C9BD5FF60E502268AFDA2032545154A7" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_C9BD5FF60E502268AFDA2032545154A7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EB66938AAD753696022720325451255A" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EB66938AAD753696022720325451255A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_2C5DC1FCECB7D07B77F2203254571304" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_2C5DC1FCECB7D07B77F2203254571304" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_649B8CD9BDA480C2FEAB2039A8CF3F72" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_649B8CD9BDA480C2FEAB2039A8CF3F72" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1FCAB4773B0162AFC7092039B8E42290" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1FCAB4773B0162AFC7092039B8E42290" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_A269B9ED4515BF4AE4B32039C5CB7814" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_A269B9ED4515BF4AE4B32039C5CB7814" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_9D19D40002FAD5EE497220416A3078FF" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_D0971BB7F43F389FBBAC2032544BAD9A" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_9D19D40002FAD5EE497220416A3078FF" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfComprehensiveIncomeDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_GuaranteeOfRegisteredSecuritiesAbstract" xlink:label="loc_aon_GuaranteeOfRegisteredSecuritiesAbstract_1E6F66DB0ADD0F56780D2030B0DF267B" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_729F13A91F97143753952030B0E0DCAF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_GuaranteeOfRegisteredSecuritiesAbstract_1E6F66DB0ADD0F56780D2030B0DF267B" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_729F13A91F97143753952030B0E0DCAF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_AB40494D448C1EE2A9962030B0E0D3A8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_729F13A91F97143753952030B0E0DCAF" xlink:to="loc_srt_ConsolidationItemsAxis_AB40494D448C1EE2A9962030B0E0D3A8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_651F8B6F8F2817AF93B32030B0E03CB6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_AB40494D448C1EE2A9962030B0E0D3A8" xlink:to="loc_srt_ConsolidationItemsDomain_651F8B6F8F2817AF93B32030B0E03CB6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationEliminationsMember" xlink:label="loc_srt_ConsolidationEliminationsMember_ED236E0F83E82BBBE6A32030B0E11ACD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_651F8B6F8F2817AF93B32030B0E03CB6" xlink:to="loc_srt_ConsolidationEliminationsMember_ED236E0F83E82BBBE6A32030B0E11ACD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1638F70D409EAC5E05752030B0E1268F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_729F13A91F97143753952030B0E0DCAF" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1638F70D409EAC5E05752030B0E1268F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_2B81136362C9DA2E797C2030B0E18DDD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1638F70D409EAC5E05752030B0E1268F" xlink:to="loc_srt_ConsolidatedEntitiesDomain_2B81136362C9DA2E797C2030B0E18DDD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_B0C553C7F7A4319D1A9B2030B0E231EF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2B81136362C9DA2E797C2030B0E18DDD" xlink:to="loc_srt_ParentCompanyMember_B0C553C7F7A4319D1A9B2030B0E231EF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_GuarantorSubsidiariesMember" xlink:label="loc_srt_GuarantorSubsidiariesMember_0D6AF5310A5E1E9FE9672030B0E2C004" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2B81136362C9DA2E797C2030B0E18DDD" xlink:to="loc_srt_GuarantorSubsidiariesMember_0D6AF5310A5E1E9FE9672030B0E2C004" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NonGuarantorSubsidiariesMember" xlink:label="loc_srt_NonGuarantorSubsidiariesMember_E8359732C5E14F21252E2030B0E2CE99" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2B81136362C9DA2E797C2030B0E18DDD" xlink:to="loc_srt_NonGuarantorSubsidiariesMember_E8359732C5E14F21252E2030B0E2CE99" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_729F13A91F97143753952030B0E0DCAF" xlink:to="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_9B4D12B9C987580832612030B0E38CD5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_ProfitLoss_9B4D12B9C987580832612030B0E38CD5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6173FE8C7D8B29C0C0D12030B0E33696" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6173FE8C7D8B29C0C0D12030B0E33696" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_1947658089266412D6D32030B0E38B24" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_1947658089266412D6D32030B0E38B24" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_B55E13DC830865FF4F7F2030B0E49C8D" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_B55E13DC830865FF4F7F2030B0E49C8D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_B4FA1632FFD6274997C52030B0E489D0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_B55E13DC830865FF4F7F2030B0E49C8D" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_B4FA1632FFD6274997C52030B0E489D0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_1FED47E6EE4636AF35D92030B0E49535" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_B55E13DC830865FF4F7F2030B0E49C8D" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_1FED47E6EE4636AF35D92030B0E49535" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_B5FBDE7550560F74677B2030B0E55B31" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_B55E13DC830865FF4F7F2030B0E49C8D" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_B5FBDE7550560F74677B2030B0E55B31" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_6B2F2AF64E8A302928602030B0E52F79" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_6B2F2AF64E8A302928602030B0E52F79" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EquityOtherComprehensiveIncomeLossFromSubsidiaries" xlink:label="loc_aon_EquityOtherComprehensiveIncomeLossFromSubsidiaries_B91AF2E77732CACC9D6F2030B0E5CF5F" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_aon_EquityOtherComprehensiveIncomeLossFromSubsidiaries_B91AF2E77732CACC9D6F2030B0E5CF5F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_0499C56939FE65F525D02030B0E5B8B5" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_0499C56939FE65F525D02030B0E5B8B5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_31E07B0D62303150EDA42030B0E57115" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_31E07B0D62303150EDA42030B0E57115" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_4351E21C07AF0DD33D652030B0E6E006" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CF012C0E356EB96EB1302030B0E3558E" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_4351E21C07AF0DD33D652030B0E6E006" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfFinancialPositionDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_CondensedFinancialStatementsDisclosureAbstract" xlink:label="loc_aon_CondensedFinancialStatementsDisclosureAbstract_E433B130D6951EDBA68620101E95E905" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_0433A9328B510CE0A11D20101E95A530" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_E433B130D6951EDBA68620101E95E905" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_0433A9328B510CE0A11D20101E95A530" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_F28C689FAC5B0156BA1020101E95E4AF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_0433A9328B510CE0A11D20101E95A530" xlink:to="loc_srt_ConsolidationItemsAxis_F28C689FAC5B0156BA1020101E95E4AF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_6978D2EC74DEBA5ECB9020101E954EE1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_F28C689FAC5B0156BA1020101E95E4AF" xlink:to="loc_srt_ConsolidationItemsDomain_6978D2EC74DEBA5ECB9020101E954EE1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationEliminationsMember" xlink:label="loc_srt_ConsolidationEliminationsMember_C1D691CB24CD10CF60E820101E968F3D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_6978D2EC74DEBA5ECB9020101E954EE1" xlink:to="loc_srt_ConsolidationEliminationsMember_C1D691CB24CD10CF60E820101E968F3D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_499989E861855B77640F20101E966F47" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_0433A9328B510CE0A11D20101E95A530" xlink:to="loc_srt_ConsolidatedEntitiesAxis_499989E861855B77640F20101E966F47" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_AD64E40AEAF9D525521820101E96DA18" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesAxis_499989E861855B77640F20101E966F47" xlink:to="loc_srt_ConsolidatedEntitiesDomain_AD64E40AEAF9D525521820101E96DA18" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_D8A822C44EFE28F963D820101E96CF91" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_AD64E40AEAF9D525521820101E96DA18" xlink:to="loc_srt_ParentCompanyMember_D8A822C44EFE28F963D820101E96CF91" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_GuarantorSubsidiariesMember" xlink:label="loc_srt_GuarantorSubsidiariesMember_0B1DA09A6AC3283E1F4420101E97A568" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_AD64E40AEAF9D525521820101E96DA18" xlink:to="loc_srt_GuarantorSubsidiariesMember_0B1DA09A6AC3283E1F4420101E97A568" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NonGuarantorSubsidiariesMember" xlink:label="loc_srt_NonGuarantorSubsidiariesMember_85B56A67F1C7631E357220101E9740F4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_AD64E40AEAF9D525521820101E96DA18" xlink:to="loc_srt_NonGuarantorSubsidiariesMember_85B56A67F1C7631E357220101E9740F4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_43F5BA0347FDE4770D6E20101E97FAD8" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_0433A9328B510CE0A11D20101E95A530" xlink:to="loc_srt_CondensedFinancialStatementsCaptionsLineItems_43F5BA0347FDE4770D6E20101E97FAD8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_43F5BA0347FDE4770D6E20101E97FAD8" xlink:to="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_F3344A29919FD0FB1F4620101E98CD74" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_F3344A29919FD0FB1F4620101E98CD74" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_EF47CF63A4EAEFA10DB320101E98B22F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_us-gaap_ShortTermInvestments_EF47CF63A4EAEFA10DB320101E98B22F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_8C8EC47751AD5D845C5720101E985FA4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_8C8EC47751AD5D845C5720101E985FA4" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryAssets" xlink:label="loc_aon_FiduciaryAssets_6C1E4D1E0ED1949EE72E20101E988F1B" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_aon_FiduciaryAssets_6C1E4D1E0ED1949EE72E20101E988F1B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DueFromRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesCurrent_EE4D79185DFECD525CD120101E9862CE" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_us-gaap_DueFromRelatedPartiesCurrent_EE4D79185DFECD525CD120101E9862CE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_DBC10556F2FE299A6D1B20101E99EB76" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_us-gaap_OtherAssetsCurrent_DBC10556F2FE299A6D1B20101E99EB76" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_6F4739A42637AEBAC93B20101E99E388" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_BAE8D2F7DB392F6713EC20101E973CD5" xlink:to="loc_us-gaap_AssetsCurrent_6F4739A42637AEBAC93B20101E99E388" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_31973B6D2B9CB63774DD20101E995AF5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_Goodwill_31973B6D2B9CB63774DD20101E995AF5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_59648579641E45568BD720101E99106B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_59648579641E45568BD720101E99106B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_8831C2BB4095F6C921F620101E996DE5" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_8831C2BB4095F6C921F620101E996DE5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_168503A63ACA704EEC9120101E99DC8B" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_168503A63ACA704EEC9120101E99DC8B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_4AD2663397B26BB0A7E120101E992EF9" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_4AD2663397B26BB0A7E120101E992EF9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DueFromRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesNoncurrent_147B6B72BC57331AC7D820101E9ACDEE" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_DueFromRelatedPartiesNoncurrent_147B6B72BC57331AC7D820101E9ACDEE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_AC1C8389640DD096F05B20101E9A5959" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_AC1C8389640DD096F05B20101E9A5959" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_550B8502734823DC0FA820101E9AC685" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_550B8502734823DC0FA820101E9AC685" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_InvestmentsInSubsidiaries" xlink:label="loc_aon_InvestmentsInSubsidiaries_6A9614E708F0C5C29EDC20101E9AEAC9" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_aon_InvestmentsInSubsidiaries_6A9614E708F0C5C29EDC20101E9AEAC9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_0BF9EF05B63F0CB7A77220101E9AB217" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_388C2F49D55BDC476ABF20101E976431" xlink:to="loc_us-gaap_Assets_0BF9EF05B63F0CB7A77220101E9AB217" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FBFD9740C7D05A0DCF7520101E9A8CBC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_43F5BA0347FDE4770D6E20101E97FAD8" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FBFD9740C7D05A0DCF7520101E9A8CBC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FBFD9740C7D05A0DCF7520101E9A8CBC" xlink:to="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9CF2B5547DBC365777A620101E9BD405" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9CF2B5547DBC365777A620101E9BD405" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_7329F283DA90E5A5067520101E9B84BF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:to="loc_us-gaap_DebtCurrent_7329F283DA90E5A5067520101E9B84BF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryLiabilities" xlink:label="loc_aon_FiduciaryLiabilities_9C2706AA01B81B2CFC7420101E9B0400" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:to="loc_aon_FiduciaryLiabilities_9C2706AA01B81B2CFC7420101E9B0400" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DueToRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_89AE4933F32FA7C3EA1020101E9C7CD8" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrent_89AE4933F32FA7C3EA1020101E9C7CD8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_750FF9C72495EB33B03420101E9C4582" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_750FF9C72495EB33B03420101E9C4582" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_3CD3E325AA45A64247D820101E9CF053" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_0CB0A270881234FB448F20101E9B448E" xlink:to="loc_us-gaap_LiabilitiesCurrent_3CD3E325AA45A64247D820101E9CF053" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_7E6F0C339CAE245444D920101E9CEAB4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_7E6F0C339CAE245444D920101E9CEAB4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_4579A362C18564E6437E20101E9C57AB" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_4579A362C18564E6437E20101E9C57AB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_F11D396D6A37FDC7D77320101E9C40A4" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_F11D396D6A37FDC7D77320101E9C40A4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent_3833B01BBE5B4FB5500120101E9DC477" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent_3833B01BBE5B4FB5500120101E9DC477" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DueToRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesNoncurrent_B28A3CAF0761B08E00CE20101E9D936C" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_DueToRelatedPartiesNoncurrent_B28A3CAF0761B08E00CE20101E9D936C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_5243AF4164E6E2D8DFA220101E9D84EF" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_5243AF4164E6E2D8DFA220101E9D84EF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_C16722FF3DC1FD7DF19D20101E9D17EA" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_9CC2F9AF045742C144C320101E9B8E54" xlink:to="loc_us-gaap_Liabilities_C16722FF3DC1FD7DF19D20101E9D17EA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_8F74EC89DB3C1EDD95C920101EA2001A" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FBFD9740C7D05A0DCF7520101E9A8CBC" xlink:to="loc_us-gaap_EquityAbstract_8F74EC89DB3C1EDD95C920101EA2001A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_A6765C6021B64CBD3C4020101EA20202" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_8F74EC89DB3C1EDD95C920101EA2001A" xlink:to="loc_us-gaap_StockholdersEquity_A6765C6021B64CBD3C4020101EA20202" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_82343A55059B5B6D798F20101EA34EA1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_8F74EC89DB3C1EDD95C920101EA2001A" xlink:to="loc_us-gaap_MinorityInterest_82343A55059B5B6D798F20101EA34EA1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_261FF486635A9E3D609820101EA3EA1D" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_8F74EC89DB3C1EDD95C920101EA2001A" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_261FF486635A9E3D609820101EA3EA1D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_8307688FAD599908263F20101EA34477" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FBFD9740C7D05A0DCF7520101E9A8CBC" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_8307688FAD599908263F20101EA34477" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesCondensedConsolidatingStatementOfIncomeDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_CondensedFinancialStatementsDisclosureAbstract" xlink:label="loc_aon_CondensedFinancialStatementsDisclosureAbstract_C889532D1F63C7B2E1F62030B0F4B8D4" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_2DF28D7B3E80624BBC762030B0F4F246" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_C889532D1F63C7B2E1F62030B0F4B8D4" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_2DF28D7B3E80624BBC762030B0F4F246" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_BB76FBE2849761B694D82030B0F46DB3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_2DF28D7B3E80624BBC762030B0F4F246" xlink:to="loc_srt_ConsolidationItemsAxis_BB76FBE2849761B694D82030B0F46DB3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_3369A891BE5CC50B96E22030B0F588B9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_BB76FBE2849761B694D82030B0F46DB3" xlink:to="loc_srt_ConsolidationItemsDomain_3369A891BE5CC50B96E22030B0F588B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationEliminationsMember" xlink:label="loc_srt_ConsolidationEliminationsMember_C9EC2C0ECD52C797007F2030B0F527AF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_3369A891BE5CC50B96E22030B0F588B9" xlink:to="loc_srt_ConsolidationEliminationsMember_C9EC2C0ECD52C797007F2030B0F527AF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_CEC14342BB975024C4C52030B0F5791D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_2DF28D7B3E80624BBC762030B0F4F246" xlink:to="loc_srt_ConsolidatedEntitiesAxis_CEC14342BB975024C4C52030B0F5791D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_2E385F1E9AA2F36A17E12030B0F69AEC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesAxis_CEC14342BB975024C4C52030B0F5791D" xlink:to="loc_srt_ConsolidatedEntitiesDomain_2E385F1E9AA2F36A17E12030B0F69AEC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_AE5EF5CD1DA7E2A4331C2030B0F62566" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2E385F1E9AA2F36A17E12030B0F69AEC" xlink:to="loc_srt_ParentCompanyMember_AE5EF5CD1DA7E2A4331C2030B0F62566" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_GuarantorSubsidiariesMember" xlink:label="loc_srt_GuarantorSubsidiariesMember_37AE9FABA26AE6A68BD82030B0F677EB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2E385F1E9AA2F36A17E12030B0F69AEC" xlink:to="loc_srt_GuarantorSubsidiariesMember_37AE9FABA26AE6A68BD82030B0F677EB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NonGuarantorSubsidiariesMember" xlink:label="loc_srt_NonGuarantorSubsidiariesMember_091514C4D998765ECBE32030B0F7D147" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2E385F1E9AA2F36A17E12030B0F69AEC" xlink:to="loc_srt_NonGuarantorSubsidiariesMember_091514C4D998765ECBE32030B0F7D147" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CEEE3FE06F432C7AE3962030B0F79873" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_2DF28D7B3E80624BBC762030B0F4F246" xlink:to="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CEEE3FE06F432C7AE3962030B0F79873" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_CEEE3FE06F432C7AE3962030B0F79873" xlink:to="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_2BDAFD7607E2945118DE2030B0F772C8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_RevenuesAbstract_2BDAFD7607E2945118DE2030B0F772C8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6DC7F402D3AEB389EDC62044C1CBF527" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_2BDAFD7607E2945118DE2030B0F772C8" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6DC7F402D3AEB389EDC62044C1CBF527" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_8471AE73BEFDD038C8A22030B0F8841A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_us-gaap_LaborAndRelatedExpense_8471AE73BEFDD038C8A22030B0F8841A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InformationTechnologyAndDataProcessing" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_846019CF091C102ED91F2030B0F88AA0" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_846019CF091C102ED91F2030B0F88AA0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_us-gaap_OccupancyNet_6B825044097EC7DD32142030B0F9F78B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_us-gaap_OccupancyNet_6B825044097EC7DD32142030B0F9F78B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_9F8FCE23945C9DFE5DCA2030B0F94319" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_us-gaap_Depreciation_9F8FCE23945C9DFE5DCA2030B0F94319" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssets" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_D944569661F9C62278032030B0F915DF" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_D944569661F9C62278032030B0F915DF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherGeneralExpenses" xlink:label="loc_aon_OtherGeneralExpenses_E14945D2B14BA2E7973D2030B0F911C8" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_aon_OtherGeneralExpenses_E14945D2B14BA2E7973D2030B0F911C8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_4C30AB853CF8AD2E64E22030B0FAA74B" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_DD7766FA808056EBAD722030B0F8856F" xlink:to="loc_us-gaap_CostsAndExpenses_4C30AB853CF8AD2E64E22030B0FAA74B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_09C678E361709272525A2030B0FA7296" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_OperatingIncomeLoss_09C678E361709272525A2030B0FA7296" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_169B76FDB2934717CA852030B0FA80EF" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_169B76FDB2934717CA852030B0FA80EF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_4A467E3BED6B81159B0A2030B0FAE92C" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_InterestExpense_4A467E3BED6B81159B0A2030B0FAE92C" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IntercompanyInterestExpenseIncome" xlink:label="loc_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IntercompanyOtherIncomeExpenseNet" xlink:label="loc_aon_IntercompanyOtherIncomeExpenseNet_EA3BDBD3044C9064E0032030B0FBB6C5" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_aon_IntercompanyOtherIncomeExpenseNet_EA3BDBD3044C9064E0032030B0FBB6C5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_723BF236B555CAABE6552030B0FB2325" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_723BF236B555CAABE6552030B0FB2325" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6C31E3289F31494A4BF82030B0FB938F" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6C31E3289F31494A4BF82030B0FB938F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_C05DEA120D470B625D192030B0FBE315" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_C05DEA120D470B625D192030B0FBE315" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_3682349C00CFF399275E2030B0FB77AC" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_3682349C00CFF399275E2030B0FB77AC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_2CC2DDC2D6E4E5E62B8A2030B0FC19F5" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_2CC2DDC2D6E4E5E62B8A2030B0FC19F5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeLossBeforeEquityEarningsOfSubsidiaries" xlink:label="loc_aon_IncomeLossBeforeEquityEarningsOfSubsidiaries_365BF4DEF5FBB6FF894B2030B0FCE8AD" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_aon_IncomeLossBeforeEquityEarningsOfSubsidiaries_365BF4DEF5FBB6FF894B2030B0FCE8AD" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EquityEarningsFromSubsidiaries" xlink:label="loc_aon_EquityEarningsFromSubsidiaries_A49EE3D13063BA6265F62030B0FC8C4F" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_aon_EquityEarningsFromSubsidiaries_A49EE3D13063BA6265F62030B0FC8C4F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_EFE6BD7F3119D427C0B02030B0FC2204" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_ProfitLoss_EFE6BD7F3119D427C0B02030B0FC2204" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_474E6DE094B0E3EB6AC52030B0FDBE0E" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_474E6DE094B0E3EB6AC52030B0FDBE0E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_B9BC0376811DD33E81AE2030B0FD5406" xlink:type="locator"/>
<link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_B9BC0376811DD33E81AE2030B0FD5406" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_GuaranteeOfRegisteredSecuritiesAbstract" xlink:label="loc_aon_GuaranteeOfRegisteredSecuritiesAbstract_1EF4E7C54178050159301B28E2733D03" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_622CDAD5AB0C895C54DE1B28E273F248" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_GuaranteeOfRegisteredSecuritiesAbstract_1EF4E7C54178050159301B28E2733D03" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_622CDAD5AB0C895C54DE1B28E273F248" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_D65241DD097B4B9D2CF01B28E274D53C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_622CDAD5AB0C895C54DE1B28E273F248" xlink:to="loc_srt_ConsolidatedEntitiesAxis_D65241DD097B4B9D2CF01B28E274D53C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_46FF9A9B08B41D2E0CC11B28E2746AAC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesAxis_D65241DD097B4B9D2CF01B28E274D53C" xlink:to="loc_srt_ConsolidatedEntitiesDomain_46FF9A9B08B41D2E0CC11B28E2746AAC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_95E41F28FC4BEBA52B0B1B28E27549D5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidatedEntitiesDomain_46FF9A9B08B41D2E0CC11B28E2746AAC" xlink:to="loc_srt_ParentCompanyMember_95E41F28FC4BEBA52B0B1B28E27549D5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_61E6F254F6DC9EAA01FC1B28E27549C1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_622CDAD5AB0C895C54DE1B28E273F248" xlink:to="loc_us-gaap_DebtInstrumentAxis_61E6F254F6DC9EAA01FC1B28E27549C1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_61E6F254F6DC9EAA01FC1B28E27549C1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.50SeniorNotesDueDecember2028Member" xlink:label="loc_aon_A4.50SeniorNotesDueDecember2028Member_FDD5D014CEBF9159134B1B28E276A055" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:to="loc_aon_A4.50SeniorNotesDueDecember2028Member_FDD5D014CEBF9159134B1B28E276A055" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2.20SeniorNotesdueNovember2022Member" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2022Member_1761981FCCCC939C45921B28E2767CD3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:to="loc_aon_A2.20SeniorNotesdueNovember2022Member_1761981FCCCC939C45921B28E2767CD3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember" xlink:label="loc_aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember_5A124CF1CDED9ABF0B061B28E2774FF2" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:to="loc_aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember_5A124CF1CDED9ABF0B061B28E2774FF2" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember" xlink:label="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_B3668E259D505AAECCC11B28E277B092" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:to="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_B3668E259D505AAECCC11B28E277B092" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.875SeniorNotesdueDecember2025Member" xlink:label="loc_aon_A3.875SeniorNotesdueDecember2025Member_7E2A9D6FAAF57ED80E721B28E27786DC" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3F99C84F54FA33B6E3E41B28E275C549" xlink:to="loc_aon_A3.875SeniorNotesdueDecember2025Member_7E2A9D6FAAF57ED80E721B28E27786DC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_B120D548763FD8C06EBD1B28E277C41A" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_622CDAD5AB0C895C54DE1B28E273F248" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_B120D548763FD8C06EBD1B28E277C41A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B120D548763FD8C06EBD1B28E277C41A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A5.00SeniorNotesDueSeptember2020Member" xlink:label="loc_aon_A5.00SeniorNotesDueSeptember2020Member_53A3A5D5222B2B70791E1B28E27D370E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A5.00SeniorNotesDueSeptember2020Member_53A3A5D5222B2B70791E1B28E27D370E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_JuniorSubordinatedDeferrableInterestDebentures8Point205PercentDue2027Member" xlink:label="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8Point205PercentDue2027Member_7047DDCB3582A3B6F2031B28E27DAFF6" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8Point205PercentDue2027Member_7047DDCB3582A3B6F2031B28E27DAFF6" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SeniorNotes625PercentDue2040Member" xlink:label="loc_aon_SeniorNotes625PercentDue2040Member_BA32C0FD31459E402EAF1B28E27EC340" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_SeniorNotes625PercentDue2040Member_BA32C0FD31459E402EAF1B28E27EC340" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.75SeniorNotesDueMay22029Member" xlink:label="loc_aon_A3.75SeniorNotesDueMay22029Member_09A6804325689456AD471B28E27EEC2D" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A3.75SeniorNotesDueMay22029Member_09A6804325689456AD471B28E27EEC2D" xlink:type="arc"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A2.20SeniorNotesdueNovember2022Member_1761981FCCCC939C45921B28E2767CD3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NotesDue2042At4250PercentMember" xlink:label="loc_aon_NotesDue2042At4250PercentMember_94CF72B19DDD24B53FCD1B28E27E37F8" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_NotesDue2042At4250PercentMember_94CF72B19DDD24B53FCD1B28E27E37F8" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NotesDueat2043at4.45PercentMember" xlink:label="loc_aon_NotesDueat2043at4.45PercentMember_8EFB647ED0D5835926071B28E27ED7BF" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_NotesDueat2043at4.45PercentMember_8EFB647ED0D5835926071B28E27ED7BF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.00SeniorNotesDueNovember2023Member" xlink:label="loc_aon_A4.00SeniorNotesDueNovember2023Member_66C4073F3B23C72C36071B28E27F6A2E" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A4.00SeniorNotesDueNovember2023Member_66C4073F3B23C72C36071B28E27F6A2E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2.875notesdue2026Member" xlink:label="loc_aon_A2.875notesdue2026Member_5992782FC2086A30AA921B28E27F3905" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A2.875notesdue2026Member_5992782FC2086A30AA921B28E27F3905" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A3.50NotesdueJune2024Member" xlink:label="loc_aon_A3.50NotesdueJune2024Member_0179F17C2FEAD913FF0A1B28E27F616F" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A3.50NotesdueJune2024Member_0179F17C2FEAD913FF0A1B28E27F616F" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A4.60SeniorNotesDueJune2044Member" xlink:label="loc_aon_A4.60SeniorNotesDueJune2044Member_413AC3DE3E9E5F9B3C1E1B28E27FBF65" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_aon_A4.60SeniorNotesDueJune2044Member_413AC3DE3E9E5F9B3C1E1B28E27FBF65" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_62C04FC8978067EEFD781B28E27FE33B" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7EBE47803C4D74E0B6881B28E27CEB3B" xlink:to="loc_us-gaap_SeniorNotesMember_62C04FC8978067EEFD781B28E27FE33B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_576D8853C272FE764CB51B28E280CF43" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_622CDAD5AB0C895C54DE1B28E273F248" xlink:to="loc_srt_CondensedFinancialStatementsCaptionsLineItems_576D8853C272FE764CB51B28E280CF43" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ED307E9FD69AEA35A5D61B28E2801594" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_576D8853C272FE764CB51B28E280CF43" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ED307E9FD69AEA35A5D61B28E2801594" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SubsidiaryGuarantorsPercentageOwned" xlink:label="loc_aon_SubsidiaryGuarantorsPercentageOwned_377825E58F9E39C388231B28E2807163" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_576D8853C272FE764CB51B28E280CF43" xlink:to="loc_aon_SubsidiaryGuarantorsPercentageOwned_377825E58F9E39C388231B28E2807163" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/GuaranteeOfRegisteredSecuritiesTables" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_CondensedFinancialStatementsDisclosureAbstract" xlink:label="loc_aon_CondensedFinancialStatementsDisclosureAbstract_11978100D608378D6163D7486B8E0248" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedIncomeStatementTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_338C71762CCFC8516ED5D7486B8F9AAC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_11978100D608378D6163D7486B8E0248" xlink:to="loc_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_338C71762CCFC8516ED5D7486B8F9AAC" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ScheduleOfCondensedComprehensiveIncomeStatementTableTextBlock" xlink:label="loc_aon_ScheduleOfCondensedComprehensiveIncomeStatementTableTextBlock_556302594CBBD5F479D5D7486B8F8792" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_11978100D608378D6163D7486B8E0248" xlink:to="loc_aon_ScheduleOfCondensedComprehensiveIncomeStatementTableTextBlock_556302594CBBD5F479D5D7486B8F8792" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedBalanceSheetTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_DB7DAEEC1BADC9F2F923D7486B8FFE1F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_11978100D608378D6163D7486B8E0248" xlink:to="loc_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_DB7DAEEC1BADC9F2F923D7486B8FFE1F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfCondensedCashFlowStatementTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_F4B7EB5A5AABC07B41BDD7486B8FF19E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CondensedFinancialStatementsDisclosureAbstract_11978100D608378D6163D7486B8E0248" xlink:to="loc_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_F4B7EB5A5AABC07B41BDD7486B8FF19E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxes" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_FB7321F07CAF37883833D74868B2F1EF" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_9D59AC8400BC3A701583D74868B2E658" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_FB7321F07CAF37883833D74868B2F1EF" xlink:to="loc_us-gaap_IncomeTaxDisclosureTextBlock_9D59AC8400BC3A701583D74868B2E658" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesComponentsOfAonsDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_C5F82152F5882E1294E21648B9A6BED2" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_5CA93D39FAA544F276BF1648B9A6CA29" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_C5F82152F5882E1294E21648B9A6BED2" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_5CA93D39FAA544F276BF1648B9A6CA29" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComponentsOfDeferredTaxAssetsAbstract" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_5CA93D39FAA544F276BF1648B9A6CA29" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards" xlink:label="loc_aon_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards_51A30408FB11F374B57E1648B9A6D7D5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_aon_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards_51A30408FB11F374B57E1648B9A6D7D5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits_9CA008814EC2DF0B06711648B9A681C8" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits_9CA008814EC2DF0B06711648B9A681C8" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxAssetsLeaseLiability" xlink:label="loc_aon_DeferredTaxAssetsLeaseLiability_36BCD1DE9AD677A5F2011685EC48E3B6" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_aon_DeferredTaxAssetsLeaseLiability_36BCD1DE9AD677A5F2011685EC48E3B6" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxAssetsAccruedInterest" xlink:label="loc_aon_DeferredTaxAssetsAccruedInterest_3F3831AE55148CD5F5401689186026D4" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_aon_DeferredTaxAssetsAccruedInterest_3F3831AE55148CD5F5401689186026D4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_8667953271BF0555B4051648B9A65CAC" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_8667953271BF0555B4051648B9A65CAC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsInvestments" xlink:label="loc_us-gaap_DeferredTaxAssetsInvestments_A15387A033BA850DF6681648B9A63489" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsInvestments_A15387A033BA850DF6681648B9A63489" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_D4C2221E08E5CC52AE601648B9A64887" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_D4C2221E08E5CC52AE601648B9A64887" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxAssetsLeaseGuarantees" xlink:label="loc_aon_DeferredTaxAssetsLeaseGuarantees_114C65149CC0D1FC754F1648B9A6C257" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_aon_DeferredTaxAssetsLeaseGuarantees_114C65149CC0D1FC754F1648B9A6C257" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_EB4CDA86A491F0423B2F1648B9A66106" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_EB4CDA86A491F0423B2F1648B9A66106" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsGross" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_1082C8EEB9E5962E39FE1648B9A69FB7" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_1082C8EEB9E5962E39FE1648B9A69FB7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_ADBE712540B6A54052DB1648B9A6071E" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_ADBE712540B6A54052DB1648B9A6071E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_DD8B11974AEA7BCBCEA11648B9A6E502" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_76FCE61FA10ED6950A1C1648B9A63323" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_DD8B11974AEA7BCBCEA11648B9A6E502" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_5CA93D39FAA544F276BF1648B9A6CA29" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment" xlink:label="loc_aon_DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment_CB5BD3F6A4C261F0D7291648B9A6E933" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_aon_DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment_CB5BD3F6A4C261F0D7291648B9A6E933" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxLiabilitiesLeaseRightofUseAsset" xlink:label="loc_aon_DeferredTaxLiabilitiesLeaseRightofUseAsset_F8A37DD51F5B60CC87F21693A5B8BB73" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_aon_DeferredTaxLiabilitiesLeaseRightofUseAsset_F8A37DD51F5B60CC87F21693A5B8BB73" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_8A95BC803B14C249E62A1648B9A6AC85" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_8A95BC803B14C249E62A1648B9A6AC85" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5C1319429F03B60EF2441648B9A67037" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5C1319429F03B60EF2441648B9A67037" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_D732C5B33CF8824D2CF41648B9A66325" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_D732C5B33CF8824D2CF41648B9A66325" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DeferredTaxLiabilitiesOtherAccruedExpenses" xlink:label="loc_aon_DeferredTaxLiabilitiesOtherAccruedExpenses_6609C05FB3D2D7AF68221648B9A6BD7F" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_aon_DeferredTaxLiabilitiesOtherAccruedExpenses_6609C05FB3D2D7AF68221648B9A6BD7F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_C3D4E184EAB1A1CCCB131648B9A66144" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_C3D4E184EAB1A1CCCB131648B9A66144" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaap_DeferredTaxLiabilities_6870C5DB7AF930CCC2281648B9A67F6C" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_169D4FEC0EE2B4351FC71648B9A6D0EB" xlink:to="loc_us-gaap_DeferredTaxLiabilities_6870C5DB7AF930CCC2281648B9A67F6C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_AB237BB0AC9B491326D21648B9A68C7E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_5CA93D39FAA544F276BF1648B9A6CA29" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_AB237BB0AC9B491326D21648B9A68C7E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesDeferredIncomeTaxesAssetsAndLiabilitiesNettedByJurisdictionAsClassifiedInConsolidatedStatementsOfFinancialPositionDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_D62E9A1985D39C736E4D2A57E0C68766" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_860A508FDC26913B7D1C2A792123C523" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_D62E9A1985D39C736E4D2A57E0C68766" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_860A508FDC26913B7D1C2A792123C523" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_5EC5A6ACE6BABF0DF5892A79888F07DE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_D62E9A1985D39C736E4D2A57E0C68766" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_5EC5A6ACE6BABF0DF5892A79888F07DE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_1087D52751993AF253CC2A57E0C6414E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_D62E9A1985D39C736E4D2A57E0C68766" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_1087D52751993AF253CC2A57E0C6414E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesIncomeFromContinuingOperationsBeforeIncomeTaxDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_591A0F69D73AE63E0BE5F09D53600995" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeTaxAuthorityTable" xlink:label="loc_aon_IncomeTaxAuthorityTable_34D6835993EB53F5337CF09D53603D43" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_591A0F69D73AE63E0BE5F09D53600995" xlink:to="loc_aon_IncomeTaxAuthorityTable_34D6835993EB53F5337CF09D53603D43" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_2181E8BEB8945DFBD770F09D53606FB0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityTable_34D6835993EB53F5337CF09D53603D43" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_2181E8BEB8945DFBD770F09D53606FB0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_DBA53539792611154686F09D5361AFA2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_2181E8BEB8945DFBD770F09D53606FB0" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_DBA53539792611154686F09D5361AFA2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaap_DomesticCountryMember_BC78F4FA05446DBC660BF09D536144ED" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_DBA53539792611154686F09D5361AFA2" xlink:to="loc_us-gaap_DomesticCountryMember_BC78F4FA05446DBC660BF09D536144ED" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="loc_us-gaap_ForeignCountryMember_5F7B3C59005F316DB423F09D5361E274" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_DBA53539792611154686F09D5361AFA2" xlink:to="loc_us-gaap_ForeignCountryMember_5F7B3C59005F316DB423F09D5361E274" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_77B546CE75FD6160F4D3F09D53618ABD" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_DBA53539792611154686F09D5361AFA2" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_77B546CE75FD6160F4D3F09D53618ABD" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherCountryMember" xlink:label="loc_aon_OtherCountryMember_6A832C32EFF6D4C928FDF09D53614652" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_DBA53539792611154686F09D5361AFA2" xlink:to="loc_aon_OtherCountryMember_6A832C32EFF6D4C928FDF09D53614652" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeTaxAuthorityLineItems" xlink:label="loc_aon_IncomeTaxAuthorityLineItems_A4F52FCE4B9F3C1EB4F8F09D5361952D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityTable_34D6835993EB53F5337CF09D53603D43" xlink:to="loc_aon_IncomeTaxAuthorityLineItems_A4F52FCE4B9F3C1EB4F8F09D5361952D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract" xlink:label="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract_6C048F880F1038122371F09D53623EA3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityLineItems_A4F52FCE4B9F3C1EB4F8F09D5361952D" xlink:to="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract_6C048F880F1038122371F09D53623EA3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes" xlink:label="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes_509654A15A36BDBAD025F09D5362D4BF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract_6C048F880F1038122371F09D53623EA3" xlink:to="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes_509654A15A36BDBAD025F09D5362D4BF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_407073AC3C0CF75DC29AF09D5362D641" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityLineItems_A4F52FCE4B9F3C1EB4F8F09D5361952D" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_407073AC3C0CF75DC29AF09D5362D641" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_7DEB9732C27E9AF58879F09D5362B4E0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_407073AC3C0CF75DC29AF09D5362D641" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_7DEB9732C27E9AF58879F09D5362B4E0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_2E8E280AC098DAD3FB17F09D5363E6A7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_7DEB9732C27E9AF58879F09D5362B4E0" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_2E8E280AC098DAD3FB17F09D5363E6A7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_64C63E9E1C5AECF5FBE9F09D53636038" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_407073AC3C0CF75DC29AF09D5362D641" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_64C63E9E1C5AECF5FBE9F09D53636038" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_D9070E5280248EEFB6A3F09D5363F3ED" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_64C63E9E1C5AECF5FBE9F09D53636038" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_D9070E5280248EEFB6A3F09D5363F3ED" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_28E696EC314F2A78F13CF09D536368C0" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_407073AC3C0CF75DC29AF09D5362D641" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_28E696EC314F2A78F13CF09D536368C0" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_1E25B982C0257514BD73FC2F7B18733B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_1E25B982C0257514BD73FC2F7B18733B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_C04610CBD000C5D587ADFC2F7B189DDF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_C04610CBD000C5D587ADFC2F7B189DDF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5C8B9FAE478C44916646FC2F7B18F331" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5C8B9FAE478C44916646FC2F7B18F331" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncomeTaxHolidayIncomeTaxBenefits" xlink:label="loc_aon_IncomeTaxHolidayIncomeTaxBenefits_752E36F4056508E60BF5FC2F7B18DA41" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_aon_IncomeTaxHolidayIncomeTaxBenefits_752E36F4056508E60BF5FC2F7B18DA41" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare" xlink:label="loc_us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare_B63C32768A836582FE5DFC2F7B18DE9F" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare_B63C32768A836582FE5DFC2F7B18DE9F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_9EB067880C84AE4B7B64FC2F7B195AD8" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_9EB067880C84AE4B7B64FC2F7B195AD8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_E1B181CB383C704A9CCBFC2F7B19C530" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_E1B181CB383C704A9CCBFC2F7B19C530" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_1BA9EF888D93D52D4452FC2F7B192607" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_BF999820E3B19620F51CFC2F7B17897F" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_1BA9EF888D93D52D4452FC2F7B192607" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesOperatingLossCarryforwardsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_40949A793D2AE811E5B7D7486CFDA210" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_5773F280D4B9E439BA7CD7486CFDE0D3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_40949A793D2AE811E5B7D7486CFDA210" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_5773F280D4B9E439BA7CD7486CFDE0D3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_5CA839F9A8B44C831121D7486CFD1379" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_5773F280D4B9E439BA7CD7486CFDE0D3" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_5CA839F9A8B44C831121D7486CFD1379" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_CD9E344F2F6DC99287AED7486CFDACC3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5CA839F9A8B44C831121D7486CFD1379" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_CD9E344F2F6DC99287AED7486CFDACC3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaap_DomesticCountryMember_888CED326E3879ECFFC5D7486CFE5215" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_CD9E344F2F6DC99287AED7486CFDACC3" xlink:to="loc_us-gaap_DomesticCountryMember_888CED326E3879ECFFC5D7486CFE5215" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InternalRevenueServiceIRSMember" xlink:label="loc_us-gaap_InternalRevenueServiceIRSMember_498ED18DA69FAE5053EAD7486CFE8A98" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_CD9E344F2F6DC99287AED7486CFDACC3" xlink:to="loc_us-gaap_InternalRevenueServiceIRSMember_498ED18DA69FAE5053EAD7486CFE8A98" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_A1B1628D6E0E5209E5E2D7486CFE77A1" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_CD9E344F2F6DC99287AED7486CFDACC3" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_A1B1628D6E0E5209E5E2D7486CFE77A1" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherCountryMember" xlink:label="loc_aon_OtherCountryMember_B429CF06259F68FFD10FD7486CFE61C3" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_CD9E344F2F6DC99287AED7486CFDACC3" xlink:to="loc_aon_OtherCountryMember_B429CF06259F68FFD10FD7486CFE61C3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_C4B30CD67F44B348BE50D7486CFF4C4A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_5773F280D4B9E439BA7CD7486CFDE0D3" xlink:to="loc_us-gaap_OperatingLossCarryforwardsLineItems_C4B30CD67F44B348BE50D7486CFF4C4A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_ED890920BAAA89C56D02D7486CFF0E64" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_C4B30CD67F44B348BE50D7486CFF4C4A" xlink:to="loc_us-gaap_OperatingLossCarryforwards_ED890920BAAA89C56D02D7486CFF0E64" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CapitalLossCarryforwards" xlink:label="loc_aon_CapitalLossCarryforwards_1DC95ACEFA6FDA561F52D7486CFF59BC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_C4B30CD67F44B348BE50D7486CFF4C4A" xlink:to="loc_aon_CapitalLossCarryforwards_1DC95ACEFA6FDA561F52D7486CFF59BC" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_InterestCarryforward" xlink:label="loc_aon_InterestCarryforward_E196A14AA70BB350E888D7486CFFA41F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_C4B30CD67F44B348BE50D7486CFF4C4A" xlink:to="loc_aon_InterestCarryforward_E196A14AA70BB350E888D7486CFFA41F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_09826D6D34AC8A2E1E1DD7486B6DDA8C" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward" xlink:label="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_09826D6D34AC8A2E1E1DD7486B6DDA8C" xlink:to="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_2F0C310BF6CBFF4B8D34D7486B6E0DDF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_2F0C310BF6CBFF4B8D34D7486B6E0DDF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_77FB8490A4232944D1C2D7486B6E8C19" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_77FB8490A4232944D1C2D7486B6E8C19" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_C32F57583C4F209F3231D7486B6E42B4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_C32F57583C4F209F3231D7486B6E42B4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_6C9C3323AD799F09CA01D7486B6E00E6" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_6C9C3323AD799F09CA01D7486B6E00E6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_E8496BB3E9FAAF9254E8D7486B6F255E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_E8496BB3E9FAAF9254E8D7486B6F255E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_AA9347BB51A22C9A6369D7486B6FBA6E" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_AA9347BB51A22C9A6369D7486B6FBA6E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_0F70C9D5010A5E8EC72FD7486B6F7C48" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_0F70C9D5010A5E8EC72FD7486B6F7C48" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation_A1879417999F8217B023D7486B6FED4B" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation_A1879417999F8217B023D7486B6FED4B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_ED99D47174C85C74DA8ED7486B6F4ACC" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_98EE57A83BEC7B0FD808D7486B6DA664" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_ED99D47174C85C74DA8ED7486B6F4ACC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesReconciliationOfIncomeTaxProvisionsBasedOnUSStatutoryCorporateTaxRateToProvisionsReflectedInConsolidatedFinancialStatementsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_B9E078D6EA21DEAF8B99D7486A4F13BD" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_B9E078D6EA21DEAF8B99D7486A4F13BD" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_783E480FFCD296A04EA8D7486A505FA1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_783E480FFCD296A04EA8D7486A505FA1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_29F298150CE46F66AB25D7486A50F2C7" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_29F298150CE46F66AB25D7486A50F2C7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_A240D0359537764474C6D7486A501D46" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_A240D0359537764474C6D7486A501D46" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_0358B059A7594562D5A6D7486A507DCB" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_0358B059A7594562D5A6D7486A507DCB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes_038A46C1C690272A85A3D7486A50C34A" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes_038A46C1C690272A85A3D7486A50C34A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_BE7AED02DAEBFC0A1E2FD7486A517567" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_BE7AED02DAEBFC0A1E2FD7486A517567" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_DDFC893309150C331727D7486A515E82" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_DDFC893309150C331727D7486A515E82" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_6A19F301C50471363FBDD7486A5150A3" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_6A19F301C50471363FBDD7486A5150A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent_CE58E5D71F7D2D1CC7F6D7486A51EA75" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent_CE58E5D71F7D2D1CC7F6D7486A51EA75" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness_9C08FA10E985DDC8D898D7486A516603" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness_9C08FA10E985DDC8D898D7486A516603" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_0B2D3EAFEEC3577925A2D7486A52B614" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_0B2D3EAFEEC3577925A2D7486A52B614" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_ACE7DE5075B88B4B2207D7486A52FC8D" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_E17E4F436E8D42D33D19D7486A4FEA89" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_ACE7DE5075B88B4B2207D7486A52FC8D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_22F37B24D79E2D348F9DF8D325BFFF70" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:to="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_22F37B24D79E2D348F9DF8D325BFFF70" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_7AEC8D6AF91BFDCEA7CEF8D325BFA74F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:to="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_7AEC8D6AF91BFDCEA7CEF8D325BFA74F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_E1393C039368AB36596FF8D325C0F215" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:to="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_E1393C039368AB36596FF8D325C0F215" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ScheduleOfDeferredTaxAssetsAndLiabilitiesNettedByJurisdictionTableTextBlock" xlink:label="loc_aon_ScheduleOfDeferredTaxAssetsAndLiabilitiesNettedByJurisdictionTableTextBlock_A4191FBFF231378A121DF8D325C04370" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:to="loc_aon_ScheduleOfDeferredTaxAssetsAndLiabilitiesNettedByJurisdictionTableTextBlock_A4191FBFF231378A121DF8D325C04370" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SummaryOfOperatingLossCarryforwardsTextBlock" xlink:label="loc_us-gaap_SummaryOfOperatingLossCarryforwardsTextBlock_6BCABADF53F79A24A408F8D325C01CCB" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:to="loc_us-gaap_SummaryOfOperatingLossCarryforwardsTextBlock_6BCABADF53F79A24A408F8D325C01CCB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SummaryOfIncomeTaxContingenciesTextBlock" xlink:label="loc_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_F429B03FDD4F1114F979F8D325C0B925" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_CF53F9069E239760E52CF8D325BFA626" xlink:to="loc_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_F429B03FDD4F1114F979F8D325C0B925" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitments" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesOperatingAbstract" xlink:label="loc_us-gaap_LeasesOperatingAbstract_9AEB1710A2FBD78E9467F09D53CC3FED" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_30593A12FADA9A4DC89FF09D53CC25B4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_9AEB1710A2FBD78E9467F09D53CC3FED" xlink:to="loc_us-gaap_LesseeOperatingLeasesTextBlock_30593A12FADA9A4DC89FF09D53CC25B4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeFinanceLeasesTextBlock" xlink:label="loc_us-gaap_LesseeFinanceLeasesTextBlock_68D71860D63BA1C0E00FF09D53CDDE27" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_9AEB1710A2FBD78E9467F09D53CC3FED" xlink:to="loc_us-gaap_LesseeFinanceLeasesTextBlock_68D71860D63BA1C0E00FF09D53CDDE27" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsAssetsAndLiabilitiesOfLesseeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_C77D917076D9DD59256BF8D326AC944F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_B2DD6B893A97546FA144F8D326AC568E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_C77D917076D9DD59256BF8D326AC944F" xlink:to="loc_us-gaap_AssetsAbstract_B2DD6B893A97546FA144F8D326AC568E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_0130E4D4327BB6264FB9F8D326AC2ACC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_B2DD6B893A97546FA144F8D326AC568E" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_0130E4D4327BB6264FB9F8D326AC2ACC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_FAF29CBA9AE3191D504CF8D326AD5977" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_B2DD6B893A97546FA144F8D326AC568E" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_FAF29CBA9AE3191D504CF8D326AD5977" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseAndFinanceLeaseRightofUseAsset" xlink:label="loc_aon_OperatingLeaseAndFinanceLeaseRightofUseAsset_8C61F920B034BCFBCD5DF8D326ADB5D3" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_B2DD6B893A97546FA144F8D326AC568E" xlink:to="loc_aon_OperatingLeaseAndFinanceLeaseRightofUseAsset_8C61F920B034BCFBCD5DF8D326ADB5D3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_FA7AF3C4A029EC61D7F1F8D326AD1A86" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_C77D917076D9DD59256BF8D326AC944F" xlink:to="loc_us-gaap_LiabilitiesAbstract_FA7AF3C4A029EC61D7F1F8D326AD1A86" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CurrentLeaseLiabilitiesAbstract" xlink:label="loc_aon_CurrentLeaseLiabilitiesAbstract_EE06A03CC8C2FDA675AAF8D326AD8868" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_FA7AF3C4A029EC61D7F1F8D326AD1A86" xlink:to="loc_aon_CurrentLeaseLiabilitiesAbstract_EE06A03CC8C2FDA675AAF8D326AD8868" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_F31B3178C3B37AD1B5F3F8D326AEA2D1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CurrentLeaseLiabilitiesAbstract_EE06A03CC8C2FDA675AAF8D326AD8868" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_F31B3178C3B37AD1B5F3F8D326AEA2D1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_01F4EF925D8EEE546A27F8D326AEA6D9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CurrentLeaseLiabilitiesAbstract_EE06A03CC8C2FDA675AAF8D326AD8868" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_01F4EF925D8EEE546A27F8D326AEA6D9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NoncurrentLeaseLiabilitiesAbstract" xlink:label="loc_aon_NoncurrentLeaseLiabilitiesAbstract_B8CFAD49468228BA1668F8D326AEA5F4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_FA7AF3C4A029EC61D7F1F8D326AD1A86" xlink:to="loc_aon_NoncurrentLeaseLiabilitiesAbstract_B8CFAD49468228BA1668F8D326AEA5F4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_EC04722A57109BB2419CF8D326AE6E82" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncurrentLeaseLiabilitiesAbstract_B8CFAD49468228BA1668F8D326AEA5F4" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_EC04722A57109BB2419CF8D326AE6E82" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_F6C6D219A6E45044E6F3F8D326AF5D7A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncurrentLeaseLiabilitiesAbstract_B8CFAD49468228BA1668F8D326AEA5F4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_F6C6D219A6E45044E6F3F8D326AF5D7A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingAndFinanceLeaseLiability" xlink:label="loc_aon_OperatingAndFinanceLeaseLiability_1B96838836B8B8067E1AF8D326AFB65B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_FA7AF3C4A029EC61D7F1F8D326AD1A86" xlink:to="loc_aon_OperatingAndFinanceLeaseLiability_1B96838836B8B8067E1AF8D326AFB65B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsCashFlowOfLesseeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_F9E2E7087D22C76FAD292072412CDFEA" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CashPaidForLeasesAbstract" xlink:label="loc_aon_CashPaidForLeasesAbstract_45D6FF6B9BD06AF194882072412CAB91" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_F9E2E7087D22C76FAD292072412CDFEA" xlink:to="loc_aon_CashPaidForLeasesAbstract_45D6FF6B9BD06AF194882072412CAB91" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_119949B6B0BC6C04344D2072412CDF02" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CashPaidForLeasesAbstract_45D6FF6B9BD06AF194882072412CAB91" xlink:to="loc_us-gaap_OperatingLeasePayments_119949B6B0BC6C04344D2072412CDF02" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_5C9DA09C61C88729265B2072412D2D75" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CashPaidForLeasesAbstract_45D6FF6B9BD06AF194882072412CAB91" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_5C9DA09C61C88729265B2072412D2D75" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NoncashLeaseActivitiesAbstract" xlink:label="loc_aon_NoncashLeaseActivitiesAbstract_094C9F44E84E8231FAAF2072412D8076" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_F9E2E7087D22C76FAD292072412CDFEA" xlink:to="loc_aon_NoncashLeaseActivitiesAbstract_094C9F44E84E8231FAAF2072412D8076" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_DB9162E2D7CC5750528D2072412D4B4F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_094C9F44E84E8231FAAF2072412D8076" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_DB9162E2D7CC5750528D2072412D4B4F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_172D2D2C50D515DECFEB2072412D2699" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_094C9F44E84E8231FAAF2072412D8076" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_172D2D2C50D515DECFEB2072412D2699" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseRightOfUseAssetAmortization" xlink:label="loc_aon_OperatingLeaseRightOfUseAssetAmortization_B4C75BDC6B6DB29185402098FD2D21C9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_094C9F44E84E8231FAAF2072412D8076" xlink:to="loc_aon_OperatingLeaseRightOfUseAssetAmortization_B4C75BDC6B6DB29185402098FD2D21C9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent" xlink:label="loc_aon_IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent_A3C88A80DC19FB9ED8D2209D203AF75E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_094C9F44E84E8231FAAF2072412D8076" xlink:to="loc_aon_IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent_A3C88A80DC19FB9ED8D2209D203AF75E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseCostsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_233099265D084097658EFC2F7B6290CB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:to="loc_us-gaap_OperatingLeaseCost_233099265D084097658EFC2F7B6290CB" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinanceLeaseCost1Abstract" xlink:label="loc_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:to="loc_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_E83BA2CFBB4BA9653F3EFC2F7B625D0F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_E83BA2CFBB4BA9653F3EFC2F7B625D0F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_0D4D3F1F6558BA501069FC2F7B62E66C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:to="loc_us-gaap_VariableLeaseCost_0D4D3F1F6558BA501069FC2F7B62E66C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_D5A51D0B698CC00EA323FC2F7B63A721" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:to="loc_us-gaap_ShortTermLeaseCost_D5A51D0B698CC00EA323FC2F7B63A721" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:to="loc_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_7F1FB42453FC0EE31976FC2F7B63DDBF" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_37667E47CD6422D111A8FC2F7B61B80E" xlink:to="loc_us-gaap_LeaseCost_7F1FB42453FC0EE31976FC2F7B63DDBF" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseMaturityDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_AE1CE0EAB3E763BE971A3A83D7039F3D" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_AE1CE0EAB3E763BE971A3A83D7039F3D" xlink:to="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_62CFEA1D45A3399E395B3A83D70488FF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_62CFEA1D45A3399E395B3A83D70488FF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_DDB6F3289B30518DBE773A83D7049691" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_DDB6F3289B30518DBE773A83D7049691" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_53B1E17C435C1A7794B73A83D704EDAD" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_53B1E17C435C1A7794B73A83D704EDAD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_400A72C4D81308961FCB3A83D705A92A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_400A72C4D81308961FCB3A83D705A92A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_7873ACDE7AF0FBDA94803A83D705B269" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_7873ACDE7AF0FBDA94803A83D705B269" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_09C07EEE153DDEC1E01F3A83D7053AE2" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_09C07EEE153DDEC1E01F3A83D7053AE2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_955C0F99474A0C819F533A83D7051617" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_955C0F99474A0C819F533A83D7051617" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_8096CA228782740C90833A83D705CA9E" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_8096CA228782740C90833A83D705CA9E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_B7D111BEFE8FD9FAE0453A83D7052591" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_040CB2D66E5E2DA157CD3A83D70398CF" xlink:to="loc_us-gaap_OperatingLeaseLiability_B7D111BEFE8FD9FAE0453A83D7052591" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_AE1CE0EAB3E763BE971A3A83D7039F3D" xlink:to="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_BE21F029DC817D9E7C3B3A83D706212B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_BE21F029DC817D9E7C3B3A83D706212B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_5BDBB7DDE134FEABE2C33A83D7065432" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_5BDBB7DDE134FEABE2C33A83D7065432" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_E8EDC7E3F2B13278C2AF3A83D70639E4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_E8EDC7E3F2B13278C2AF3A83D70639E4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_C4E1C27911124052B9183A83D707EDD1" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_C4E1C27911124052B9183A83D707EDD1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_E72734736799E7D6A3543A83D706B403" xlink:to="loc_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LeasesMaturityAbstract" xlink:label="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_AE1CE0EAB3E763BE971A3A83D7039F3D" xlink:to="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear" xlink:label="loc_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive_5DAC2D30A4B9A99840D93A83D7098E9F" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive_5DAC2D30A4B9A99840D93A83D7098E9F" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue_3DB1E78E987AFED4653D3A83D70967B2" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue_3DB1E78E987AFED4653D3A83D70967B2" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount_109B79F36E10A6912A313A83D7094B35" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount_109B79F36E10A6912A313A83D7094B35" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome_C52449806731000BB3E03A83D709EDE8" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome_C52449806731000BB3E03A83D709EDE8" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseMaturityPriorToTopic842Details" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_B1B5D888CF77774A42903A83D6EC3E07" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_B1B5D888CF77774A42903A83D6EC3E07" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_CF075024FBA9AE2D2C853A83D6ED20C6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_CF075024FBA9AE2D2C853A83D6ED20C6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_732643D5C368CBB991A93A83D6ED6CAE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_732643D5C368CBB991A93A83D6ED6CAE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B6C78853A713628159E23A83D6EE6351" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B6C78853A713628159E23A83D6EE6351" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_23E1E4441892176CD4B43A83D6EEBDC6" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_23E1E4441892176CD4B43A83D6EEBDC6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_1F1E010C2C523AF4BC463A83D6EED37E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_1F1E010C2C523AF4BC463A83D6EED37E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_971CD97FF652300C343C3A83D6EEF479" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_971CD97FF652300C343C3A83D6EEF479" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_39718AEAC2DF5BF4C64C3A83D6EF80DA" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_08B139ADC0FB275FCE8A3A83D6EC0145" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_39718AEAC2DF5BF4C64C3A83D6EF80DA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SubleaseIncomePaymentsDueAbstract" xlink:label="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_B1B5D888CF77774A42903A83D6EC3E07" xlink:to="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsNextTwelveMonths" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsNextTwelveMonths_9437169E9433A37A33203A83D6F0279E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsNextTwelveMonths_9437169E9433A37A33203A83D6F0279E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearTwo" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearTwo_6B96705BF1168341B4C13A83D6F02223" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearTwo_6B96705BF1168341B4C13A83D6F02223" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsYearThree" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsYearThree_D8E79D692837B4681CD73A83D6F048FE" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsYearThree_D8E79D692837B4681CD73A83D6F048FE" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFour" xlink:label="loc_aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFour_B58C70915716E1651FF83A83D6F0D471" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFour_B58C70915716E1651FF83A83D6F0D471" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFive" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFive_8B98B4A045389570ACE93A83D6F05ADD" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFive_8B98B4A045389570ACE93A83D6F05ADD" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalPaymentsAfterYearFive" xlink:label="loc_aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalPaymentsAfterYearFive_FC881661E224987705E13A83D6F1C8E2" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentalPaymentsAfterYearFive_FC881661E224987705E13A83D6F1C8E2" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentals" xlink:label="loc_aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentals_04FCB30463BE15296F663A83D6F14239" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SubleaseIncomePaymentsDueAbstract_27ABF8137BBFB81C67243A83D6EFBF45" xlink:to="loc_aon_OperatingLeaseFutureMinimumPaymentsDueFutureMinimumSubleaseRentals_04FCB30463BE15296F663A83D6F14239" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract" xlink:label="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_B1B5D888CF77774A42903A83D6EC3E07" xlink:to="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseFutureMinimumPaymentsDueNetOfSubleaseIncomeNextTwelveMonths" xlink:label="loc_aon_OperatingLeaseFutureMinimumPaymentsDueNetOfSubleaseIncomeNextTwelveMonths_9AD55F4FE41A0CBA6E683A83D6F136A0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeaseFutureMinimumPaymentsDueNetOfSubleaseIncomeNextTwelveMonths_9AD55F4FE41A0CBA6E683A83D6F136A0" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInTwoYears" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInTwoYears_6107C146670EDABA84553A83D6F235D7" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInTwoYears_6107C146670EDABA84553A83D6F235D7" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInThreeYears" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInThreeYears_D50A060FDB9A84E3F8BF3A83D6F24892" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInThreeYears_D50A060FDB9A84E3F8BF3A83D6F24892" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFourYears" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFourYears_89FB0C8247332FAB83863A83D6F24C9F" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFourYears_89FB0C8247332FAB83863A83D6F24C9F" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFiveYears" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFiveYears_F7061687E2DAAC7046A93A83D6F2B04D" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFiveYears_F7061687E2DAAC7046A93A83D6F2B04D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueAfterYearFive" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueAfterYearFive_65F896D042A212B620813A83D6F33322" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueAfterYearFive_65F896D042A212B620813A83D6F33322" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentals" xlink:label="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentals_37DE5D7752499556B5D93A83D6F3F5A6" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OperatingLeasePaymentsNetOfSubleaseRentalIncomeAbstract_0437FBCD43F92AD43DBA3A83D6F1A8F9" xlink:to="loc_aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentals_37DE5D7752499556B5D93A83D6F3F5A6" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseTermsAndAssumptionsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_F4DBB1178B70E766EAB5F09D53AA2855" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LesseeWeightedaverageRemainingLeaseTermAbstract" xlink:label="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_D35469E991E22BE02C54F09D53AA1D82" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_F4DBB1178B70E766EAB5F09D53AA2855" xlink:to="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_D35469E991E22BE02C54F09D53AA1D82" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_72FEC44CE77219399F1CF09D53AB2433" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_D35469E991E22BE02C54F09D53AA1D82" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_72FEC44CE77219399F1CF09D53AB2433" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_ACB7279F906AEE682A32F09D53ABA0FF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_D35469E991E22BE02C54F09D53AA1D82" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_ACB7279F906AEE682A32F09D53ABA0FF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LesseeWeightedAverageDiscountRateAbstract" xlink:label="loc_aon_LesseeWeightedAverageDiscountRateAbstract_51A7BC28E22E073F294BF09D53AB9C85" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_F4DBB1178B70E766EAB5F09D53AA2855" xlink:to="loc_aon_LesseeWeightedAverageDiscountRateAbstract_51A7BC28E22E073F294BF09D53AB9C85" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseDiscountRate" xlink:label="loc_us-gaap_LesseeOperatingLeaseDiscountRate_19FE44B2C7182068B509F09D53AB1F7B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedAverageDiscountRateAbstract_51A7BC28E22E073F294BF09D53AB9C85" xlink:to="loc_us-gaap_LesseeOperatingLeaseDiscountRate_19FE44B2C7182068B509F09D53AB1F7B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeFinanceLeaseDiscountRate" xlink:label="loc_us-gaap_LesseeFinanceLeaseDiscountRate_0FAF09FE19844A09F8A6F09D53AB4E5F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedAverageDiscountRateAbstract_51A7BC28E22E073F294BF09D53AB9C85" xlink:to="loc_us-gaap_LesseeFinanceLeaseDiscountRate_0FAF09FE19844A09F8A6F09D53AB4E5F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesOperatingAbstract" xlink:label="loc_us-gaap_LeasesOperatingAbstract_E450DD9FC0677A77B70DF09D53C8DAA3" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AssetsAndLiabilitiesOfLesseeTableTextBlock" xlink:label="loc_aon_AssetsAndLiabilitiesOfLesseeTableTextBlock_1B883123763342F8F30AF09D53C9E71E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_E450DD9FC0677A77B70DF09D53C8DAA3" xlink:to="loc_aon_AssetsAndLiabilitiesOfLesseeTableTextBlock_1B883123763342F8F30AF09D53C9E71E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_3CD881919A2471FC8E3EF09D53C97D77" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_E450DD9FC0677A77B70DF09D53C8DAA3" xlink:to="loc_us-gaap_LeaseCostTableTextBlock_3CD881919A2471FC8E3EF09D53C97D77" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_363B6C7C392A550C55C6F09D53C907C4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_E450DD9FC0677A77B70DF09D53C8DAA3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_363B6C7C392A550C55C6F09D53C907C4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_529729778243BCF63C20F09D53C9E5B9" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_E450DD9FC0677A77B70DF09D53C8DAA3" xlink:to="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_529729778243BCF63C20F09D53C9E5B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock_39A873386818A75881FFF09D53C92515" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesOperatingAbstract_E450DD9FC0677A77B70DF09D53C8DAA3" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock_39A873386818A75881FFF09D53C92515" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialData" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_3D648B47CC5F8CA42236D7486C6F51F1" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalFinancialInformationDisclosureTextBlock" xlink:label="loc_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_2BEAF66F94198A1E0605D7486C6F8465" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_3D648B47CC5F8CA42236D7486C6F51F1" xlink:to="loc_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_2BEAF66F94198A1E0605D7486C6F8465" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataComponentsOfFixedAssetsNetDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_9A4C0A9B26CDD15520922528598C3806" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_23451637A7704168B26B2528598CF1E5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9A4C0A9B26CDD15520922528598C3806" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_23451637A7704168B26B2528598CF1E5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_237D9734960EBA01C4492528598C648B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_23451637A7704168B26B2528598CF1E5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_237D9734960EBA01C4492528598C648B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_237D9734960EBA01C4492528598C648B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_377C5A3E1D6FDE7815AA2528598D1319" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_377C5A3E1D6FDE7815AA2528598D1319" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_E5F646D6C9E82EFE9E052528598DE2F3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_E5F646D6C9E82EFE9E052528598DE2F3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_33A752518EAF54F316B12528598DBDB9" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:to="loc_us-gaap_ComputerEquipmentMember_33A752518EAF54F316B12528598DBDB9" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FurnitureFixturesAndEquipmentMember" xlink:label="loc_aon_FurnitureFixturesAndEquipmentMember_099C87B3E445EE71763A2528598ECA6D" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:to="loc_aon_FurnitureFixturesAndEquipmentMember_099C87B3E445EE71763A2528598ECA6D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="loc_us-gaap_ConstructionInProgressMember_AA0D386447E4B4A4065F2528598EFF7A" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:to="loc_us-gaap_ConstructionInProgressMember_AA0D386447E4B4A4065F2528598EFF7A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_0C7719909093F262319C2528598EBABD" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F32AC889A4358D896CEC2528598D6DDB" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_0C7719909093F262319C2528598EBABD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9475031E80A2874AB3012528598ED51A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_23451637A7704168B26B2528598CF1E5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9475031E80A2874AB3012528598ED51A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_493C43ADED55D4932B6D2528598F0A70" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9475031E80A2874AB3012528598ED51A" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_493C43ADED55D4932B6D2528598F0A70" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0D2674AB2F59D174BEA62528598FFA6C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9475031E80A2874AB3012528598ED51A" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0D2674AB2F59D174BEA62528598FFA6C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_A5BF4A5E90BF88D79BE22528598F00F8" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9475031E80A2874AB3012528598ED51A" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_A5BF4A5E90BF88D79BE22528598F00F8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_BC4BD5AB93E3C09B4299252859903A69" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9475031E80A2874AB3012528598ED51A" xlink:to="loc_us-gaap_Depreciation_BC4BD5AB93E3C09B4299252859903A69" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleOfAllowanceForDoubtfulAccountsDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_12E33B122BD24C0AC45DF6E340CA53D7" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_12E33B122BD24C0AC45DF6E340CA53D7" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_D8F6CC9333D0B919638FF6E340CB70FD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_D8F6CC9333D0B919638FF6E340CB70FD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_044DD38AA320E39ECC48F6E340CBF184" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_044DD38AA320E39ECC48F6E340CBF184" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_40D04E1EA698EF9DD2E1F6E340CB8A40" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_40D04E1EA698EF9DD2E1F6E340CB8A40" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease_A4FE6ED08D37860487ACF6E340CBEA42" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease_A4FE6ED08D37860487ACF6E340CBEA42" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_11135587CCC89AA38E29F6E340CC2E37" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_6943433F8ED832C3E1EFF6E340CA7EA3" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_11135587CCC89AA38E29F6E340CC2E37" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherCurrentAssetsDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_1937A1290A272BAEB36E12266ED935E3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_1937A1290A272BAEB36E12266ED935E3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherTaxAssetsCurrent" xlink:label="loc_aon_OtherTaxAssetsCurrent_1212576B16EE0632421712266EDA34B7" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:to="loc_aon_OtherTaxAssetsCurrent_1212576B16EE0632421712266EDA34B7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_471C5EA76BECB6E032ED12266EDABF0A" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_471C5EA76BECB6E032ED12266EDABF0A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_4EA6A92F4DD9A8DC78D512266EDA0842" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_4EA6A92F4DD9A8DC78D512266EDA0842" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsMiscellaneousCurrent" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousCurrent_E57A7E682CE9C66740A412266EDAEC0B" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousCurrent_E57A7E682CE9C66740A412266EDAEC0B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_1FFA9E3A9E1D6725B6DA12266EDA5759" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_2C837C06644B26FB3F3712266ED92669" xlink:to="loc_us-gaap_OtherAssetsCurrent_1FFA9E3A9E1D6725B6DA12266EDA5759" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherCurrentLiabilitiesDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent" xlink:label="loc_aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent_F87C3E3CB4AB8D2F702B12266EC78201" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:to="loc_aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent_F87C3E3CB4AB8D2F702B12266EC78201" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_7C6380FA803C86AD0E2412266EC7CEEF" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_7C6380FA803C86AD0E2412266EC7CEEF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_AEFBADA6F22A699A873312266EC8792C" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_AEFBADA6F22A699A873312266EC8792C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_C5679CD77EFE40A1FBA912266EC8BA1C" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_F434518C6E1365BE7DBE12266EC764F4" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_C5679CD77EFE40A1FBA912266EC8BA1C" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherIncomeExpenseDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_FF11300F1D46265EC587FC7EF4B3A324" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_FF11300F1D46265EC587FC7EF4B3A324" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_AA13EEE9B609F8F91663FC7EF4B32B16" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_AA13EEE9B609F8F91663FC7EF4B32B16" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionExpense" xlink:label="loc_us-gaap_PensionExpense_BBC9B3886ED38CC589B8FC7EF4B41410" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:to="loc_us-gaap_PensionExpense_BBC9B3886ED38CC589B8FC7EF4B41410" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_CF7C9074EB1E307AA9ECFC7EF4B4B217" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_CF7C9074EB1E307AA9ECFC7EF4B4B217" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_14F0298423D6CEB6B8F4FC7EF4B4CB23" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_14F0298423D6CEB6B8F4FC7EF4B4CB23" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_ACBD902824596DD6D98FFC7EF4B4E573" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_C931C6B736A359AB8AB2FC7EF4B39649" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_ACBD902824596DD6D98FFC7EF4B4E573" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherNonCurrentAssetsDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_EE353DEEFC416AD78DC712266ECC75C7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_EE353DEEFC416AD78DC712266ECC75C7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="loc_us-gaap_LongTermInvestments_50D6A02217DCD0C224C312266ECD85AE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:to="loc_us-gaap_LongTermInvestments_50D6A02217DCD0C224C312266ECD85AE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_29C75959B6BA6C6D145512266ECD237F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_29C75959B6BA6C6D145512266ECD237F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxesReceivableNoncurrent" xlink:label="loc_us-gaap_IncomeTaxesReceivableNoncurrent_17F4A84A4A2F1EECA60F12266ECD944E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:to="loc_us-gaap_IncomeTaxesReceivableNoncurrent_17F4A84A4A2F1EECA60F12266ECD944E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_5A462EE4C90D4C22C88512266ECD6180" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_5A462EE4C90D4C22C88512266ECD6180" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_9663C5F94904F944B16F12266ECDCA53" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_9F50A5EB5D2190A24F2112266ECC0347" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_9663C5F94904F944B16F12266ECDCA53" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleOfOtherNonCurrentLiabilitiesDetails" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_902135B9D4FD6B990890207241CC06CD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_902135B9D4FD6B990890207241CC06CD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_FC0E0782235FC86F7698207241CC2743" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_FC0E0782235FC86F7698207241CC2743" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeaseObligationsNoncurrent" xlink:label="loc_us-gaap_CapitalLeaseObligationsNoncurrent_439B49FD99B359260B72207241CCE61E" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_CapitalLeaseObligationsNoncurrent_439B49FD99B359260B72207241CCE61E" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EmployeerelatedLiabilitiesNoncurrent" xlink:label="loc_aon_EmployeerelatedLiabilitiesNoncurrent_078EDC89D93842E203B7207241CCBDC6" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_aon_EmployeerelatedLiabilitiesNoncurrent_078EDC89D93842E203B7207241CCBDC6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_A5FB399D24AF82FE1EEC207241CDBAA9" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_A5FB399D24AF82FE1EEC207241CDBAA9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAccruedLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_1862053420FD0BB2CC47207241CD9C88" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_1862053420FD0BB2CC47207241CD9C88" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_C05920893B214D23CC59207241CD603C" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_C05920893B214D23CC59207241CD603C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiabilityNoncurrent" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiabilityNoncurrent_BA6EF4B4AC7CE6DD3196207241CD0704" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_FF7B7A91CFA8DF96AA16207241CCAC1D" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiabilityNoncurrent_BA6EF4B4AC7CE6DD3196207241CD0704" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataTables" xlink:type="extended">
<link:loc xlink:href="aon-20191231.xsd#aon_OtherFinancialDataAbstract" xlink:label="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock_F9ECF4300666A00B52FAD748687409A7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock_F9ECF4300666A00B52FAD748687409A7" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ScheduleofAccountsNotesLoansandFinancingReceivableAllowanceforDoubtfulAccountsTableTextBlock" xlink:label="loc_aon_ScheduleofAccountsNotesLoansandFinancingReceivableAllowanceforDoubtfulAccountsTableTextBlock_73517AF186EB05FF8AB3D7486874B051" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_aon_ScheduleofAccountsNotesLoansandFinancingReceivableAllowanceforDoubtfulAccountsTableTextBlock_73517AF186EB05FF8AB3D7486874B051" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock_C3F10CBFA327E55B5347D748687440AA" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock_C3F10CBFA327E55B5347D748687440AA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ScheduleOfPropertyPlantAndEquipmentComponentsTableTextBlock" xlink:label="loc_aon_ScheduleOfPropertyPlantAndEquipmentComponentsTableTextBlock_F3434FD6C8E77DA4C675D74868744461" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_aon_ScheduleOfPropertyPlantAndEquipmentComponentsTableTextBlock_F3434FD6C8E77DA4C675D74868744461" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock" xlink:label="loc_us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock_FA880D9FE904F15FA889D748687446F6" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock_FA880D9FE904F15FA889D748687446F6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherCurrentLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesTableTextBlock_066AF48D23B0EF21A14DD74868746F0E" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesTableTextBlock_066AF48D23B0EF21A14DD74868746F0E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_6FAAD4E25532E0D554CDD74868744AE2" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_6930B1DEA187EB932E6FD7486874C487" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_6FAAD4E25532E0D554CDD74868744AE2" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/QuarterlyFinancialDataUnaudited" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QuarterlyFinancialInformationDisclosureAbstract" xlink:label="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_26AA1B3D1372FCA1627AD7486883C763" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QuarterlyFinancialInformationTextBlock" xlink:label="loc_us-gaap_QuarterlyFinancialInformationTextBlock_1ADC38F014B1AA60AA5CD74868839EEE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_26AA1B3D1372FCA1627AD7486883C763" xlink:to="loc_us-gaap_QuarterlyFinancialInformationTextBlock_1ADC38F014B1AA60AA5CD74868839EEE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/QuarterlyFinancialDataUnauditedDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QuarterlyFinancialInformationDisclosureAbstract" xlink:label="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_4E214C7E406A7F87D9743A83D399A1F9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_4E214C7E406A7F87D9743A83D399A1F9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_6375E22D8106CA332EBF3A83D3990089" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/netLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_OperatingIncomeLoss_6375E22D8106CA332EBF3A83D3990089" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_70EBFC6235509D4FB7AC3A83D399EE2B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_70EBFC6235509D4FB7AC3A83D399EE2B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_66ABD306837EC288ECE33A83D39A3667" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_66ABD306837EC288ECE33A83D39A3667" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_2B970E03FFC6741B085D3A83D39ADAFD" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_ProfitLoss_2B970E03FFC6741B085D3A83D39ADAFD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_A7EBD09507F0CAA3C8E03A83D39ABEAB" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_A7EBD09507F0CAA3C8E03A83D39ABEAB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_9B1973742A437D548FBF3A83D39AB9C2" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_9B1973742A437D548FBF3A83D39AB9C2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_8D59DC49BB061F9973093A83D39B1939" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_73542887B542D46117CB3A83D399A502" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_8D59DC49BB061F9973093A83D39B1939" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_1B8FCCC8681D91EC90083A83D39BA0B0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_8D59DC49BB061F9973093A83D39B1939" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_1B8FCCC8681D91EC90083A83D39BA0B0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_974A14EE5AE425CD825D3A83D39B868B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_1B8FCCC8681D91EC90083A83D39BA0B0" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_974A14EE5AE425CD825D3A83D39B868B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_A04E7CD13B4A911875063A83D39BFB67" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_1B8FCCC8681D91EC90083A83D39BA0B0" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_A04E7CD13B4A911875063A83D39BFB67" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_53BC97989D90CD4C9C7C3A83D39BBBD2" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_1B8FCCC8681D91EC90083A83D39BA0B0" xlink:to="loc_us-gaap_EarningsPerShareBasic_53BC97989D90CD4C9C7C3A83D39BBBD2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_8B6B932ABFDEDABD6B033A83D39CCBEA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_8D59DC49BB061F9973093A83D39B1939" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_8B6B932ABFDEDABD6B033A83D39CCBEA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_E214A5181615AE445AC13A83D39C8EAD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_8B6B932ABFDEDABD6B033A83D39CCBEA" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_E214A5181615AE445AC13A83D39C8EAD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_7A95CC0BFE04A5A7B5A73A83D39C9BC9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_8B6B932ABFDEDABD6B033A83D39CCBEA" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_7A95CC0BFE04A5A7B5A73A83D39C9BC9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_CEC0DB81F53B44E767FB3A83D39C0038" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_8B6B932ABFDEDABD6B033A83D39CCBEA" xlink:to="loc_us-gaap_EarningsPerShareDiluted_CEC0DB81F53B44E767FB3A83D39C0038" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/QuarterlyFinancialDataUnauditedTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QuarterlyFinancialInformationDisclosureAbstract" xlink:label="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_08DF483B67D10F3FA6EAD74868746BFC" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_F78BA5A374ACE9567D81D7486874F2BF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_QuarterlyFinancialInformationDisclosureAbstract_08DF483B67D10F3FA6EAD74868746BFC" xlink:to="loc_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_F78BA5A374ACE9567D81D7486874F2BF" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/Restructuring" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_619112CED918D6F4EEAED7486A76B047" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_9643F45488BCCB95497FD7486A764348" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_619112CED918D6F4EEAED7486A76B047" xlink:to="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_9643F45488BCCB95497FD7486A764348" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RestructuringNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_19FF173704823554D6131648BA610DA9" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_FAFEBEE3EEF6F256A69F1648BA616BAD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_19FF173704823554D6131648BA610DA9" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_FAFEBEE3EEF6F256A69F1648BA616BAD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_B959DD4F80B44D8B06BA1648BA6115D7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_FAFEBEE3EEF6F256A69F1648BA616BAD" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_B959DD4F80B44D8B06BA1648BA6115D7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_A4777E4EFDB79E02D6141648BA611861" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_B959DD4F80B44D8B06BA1648BA6115D7" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_A4777E4EFDB79E02D6141648BA611861" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_17C3B2D45C350702B1201648BA61E1CD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4777E4EFDB79E02D6141648BA611861" xlink:to="loc_us-gaap_EmployeeSeveranceMember_17C3B2D45C350702B1201648BA61E1CD" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TechnologyRationalizationMember" xlink:label="loc_aon_TechnologyRationalizationMember_67CF3A4FDD7C2E066B0B1648BA61810A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4777E4EFDB79E02D6141648BA611861" xlink:to="loc_aon_TechnologyRationalizationMember_67CF3A4FDD7C2E066B0B1648BA61810A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RealEstateRealizationCostsMember" xlink:label="loc_aon_RealEstateRealizationCostsMember_E591B705EF61E846298E1648BA61DA3D" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4777E4EFDB79E02D6141648BA611861" xlink:to="loc_aon_RealEstateRealizationCostsMember_E591B705EF61E846298E1648BA61DA3D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AssetImpairmentsMember" xlink:label="loc_aon_AssetImpairmentsMember_F3018792A1FA5F3BFA0E1648BA7128CA" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4777E4EFDB79E02D6141648BA611861" xlink:to="loc_aon_AssetImpairmentsMember_F3018792A1FA5F3BFA0E1648BA7128CA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_C6157A5154650E9A1DBF1648BA716606" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_FAFEBEE3EEF6F256A69F1648BA616BAD" xlink:to="loc_us-gaap_RestructuringPlanAxis_C6157A5154650E9A1DBF1648BA716606" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_DD840542925E7994DBBB1648BA710958" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringPlanAxis_C6157A5154650E9A1DBF1648BA716606" xlink:to="loc_us-gaap_RestructuringPlanDomain_DD840542925E7994DBBB1648BA710958" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2017PlanMember" xlink:label="loc_aon_A2017PlanMember_FE9B62D2B56A1004A8261648BA7185A7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringPlanDomain_DD840542925E7994DBBB1648BA710958" xlink:to="loc_aon_A2017PlanMember_FE9B62D2B56A1004A8261648BA7185A7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_B1A67915BA2CC00AC18D1648BA719A04" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_FAFEBEE3EEF6F256A69F1648BA616BAD" xlink:to="loc_us-gaap_RestructuringCostAndReserveLineItems_B1A67915BA2CC00AC18D1648BA719A04" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_BA4A863E61EFFB8E65801648BA711436" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_B1A67915BA2CC00AC18D1648BA719A04" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_BA4A863E61EFFB8E65801648BA711436" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_8CEF35C6260C7F674CEF1648BA71E3CE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_B1A67915BA2CC00AC18D1648BA719A04" xlink:to="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_8CEF35C6260C7F674CEF1648BA71E3CE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RestructuringRestructuringAndRelatedActivitiesTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_4DC465AA498311D9BE90D7486A45233D" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_B04CFC1B1F501926168ED7486A46C3F5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_4DC465AA498311D9BE90D7486A45233D" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_B04CFC1B1F501926168ED7486A46C3F5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_6795CA89B02B7BFDA55BD7486A460B89" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_4DC465AA498311D9BE90D7486A45233D" xlink:to="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_6795CA89B02B7BFDA55BD7486A460B89" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RestructuringScheduleOfRestructuringAndRelatedExpenseDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_1BC7BDDAA16021730CF2FC2F7BCD1C0F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7CCC0259A4F5FD6B022FFC2F7BCD8F5F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_1BC7BDDAA16021730CF2FC2F7BCD1C0F" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7CCC0259A4F5FD6B022FFC2F7BCD8F5F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_255E6EC820C748B54B23FC2F7BCD9E34" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7CCC0259A4F5FD6B022FFC2F7BCD8F5F" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_255E6EC820C748B54B23FC2F7BCD9E34" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_255E6EC820C748B54B23FC2F7BCD9E34" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_94F919881877C5BA1B87FC2F7BCEB48B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:to="loc_us-gaap_EmployeeSeveranceMember_94F919881877C5BA1B87FC2F7BCEB48B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TechnologyRationalizationMember" xlink:label="loc_aon_TechnologyRationalizationMember_03256FA0365A1FD4C122FC2F7BCE01BB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:to="loc_aon_TechnologyRationalizationMember_03256FA0365A1FD4C122FC2F7BCE01BB" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RealEstateRealizationCostsMember" xlink:label="loc_aon_RealEstateRealizationCostsMember_CC1947CCCD34F0E300A7FC2F7BCE0C47" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:to="loc_aon_RealEstateRealizationCostsMember_CC1947CCCD34F0E300A7FC2F7BCE0C47" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AssetImpairmentsMember" xlink:label="loc_aon_AssetImpairmentsMember_1C75CF1560F34E916779FC2F7BCE1A45" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:to="loc_aon_AssetImpairmentsMember_1C75CF1560F34E916779FC2F7BCE1A45" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="loc_us-gaap_OtherRestructuringMember_4015DA8C034EADF91937FC2F7BCEF01E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_91EF8AA2AB4EBD19E2BDFC2F7BCD2711" xlink:to="loc_us-gaap_OtherRestructuringMember_4015DA8C034EADF91937FC2F7BCEF01E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_69DE1B791467D38F2C6FFC2F7BCF8EE3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7CCC0259A4F5FD6B022FFC2F7BCD8F5F" xlink:to="loc_us-gaap_RestructuringPlanAxis_69DE1B791467D38F2C6FFC2F7BCF8EE3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_727757133CB361B5743AFC2F7BCFE488" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringPlanAxis_69DE1B791467D38F2C6FFC2F7BCF8EE3" xlink:to="loc_us-gaap_RestructuringPlanDomain_727757133CB361B5743AFC2F7BCFE488" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2017PlanMember" xlink:label="loc_aon_A2017PlanMember_17FED4880B58728F3C1CFC2F7BCF9517" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringPlanDomain_727757133CB361B5743AFC2F7BCFE488" xlink:to="loc_aon_A2017PlanMember_17FED4880B58728F3C1CFC2F7BCF9517" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_6869C3B18F0B6BD1D57EFC2F7BCF0203" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7CCC0259A4F5FD6B022FFC2F7BCD8F5F" xlink:to="loc_us-gaap_RestructuringCostAndReserveLineItems_6869C3B18F0B6BD1D57EFC2F7BCF0203" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_D8566B190FCBF8F9DF88FC2F7BCF06BC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6869C3B18F0B6BD1D57EFC2F7BCF0203" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_D8566B190FCBF8F9DF88FC2F7BCF06BC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_E4E6411BF214AF02B138FC3A77B18202" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6869C3B18F0B6BD1D57EFC2F7BCF0203" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_E4E6411BF214AF02B138FC3A77B18202" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RestructuringandRelatedCostIncurredContractTerminationCosts" xlink:label="loc_aon_RestructuringandRelatedCostIncurredContractTerminationCosts_03977F5612B8C95AE823FC2F7BD0737B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6869C3B18F0B6BD1D57EFC2F7BCF0203" xlink:to="loc_aon_RestructuringandRelatedCostIncurredContractTerminationCosts_03977F5612B8C95AE823FC2F7BD0737B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RestructuringScheduleOfRestructuringReserveDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_AC148C5085D0F781A3A62A57E2C4AC43" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1F9B1BE89552640AB0882A57E2C55BB7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_AC148C5085D0F781A3A62A57E2C4AC43" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1F9B1BE89552640AB0882A57E2C55BB7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_F945687181F6F32B0A052A57E2C5DE2A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1F9B1BE89552640AB0882A57E2C55BB7" xlink:to="loc_us-gaap_RestructuringPlanAxis_F945687181F6F32B0A052A57E2C5DE2A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_0B345EEE3C5E50AC67E22A57E2C69593" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringPlanAxis_F945687181F6F32B0A052A57E2C5DE2A" xlink:to="loc_us-gaap_RestructuringPlanDomain_0B345EEE3C5E50AC67E22A57E2C69593" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_A2017PlanMember" xlink:label="loc_aon_A2017PlanMember_E16762CD644AE3DA50632A57E2C68C3F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringPlanDomain_0B345EEE3C5E50AC67E22A57E2C69593" xlink:to="loc_aon_A2017PlanMember_E16762CD644AE3DA50632A57E2C68C3F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1F9B1BE89552640AB0882A57E2C55BB7" xlink:to="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_9265ADE4F3BF9AF2A0682A57E2C74A7F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:to="loc_us-gaap_RestructuringReserve_9265ADE4F3BF9AF2A0682A57E2C74A7F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_70C2E072624D008FD7062A57E2C7D27A" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:to="loc_us-gaap_RestructuringCharges_70C2E072624D008FD7062A57E2C7D27A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRestructuring" xlink:label="loc_us-gaap_PaymentsForRestructuring_6D6EE1EB8071BBD189002A57E2C855DD" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:to="loc_us-gaap_PaymentsForRestructuring_6D6EE1EB8071BBD189002A57E2C855DD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveTranslationAdjustment" xlink:label="loc_us-gaap_RestructuringReserveTranslationAdjustment_E526C2C3FE0C8444E3DC2A57E2C8B0C6" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:to="loc_us-gaap_RestructuringReserveTranslationAdjustment_E526C2C3FE0C8444E3DC2A57E2C8B0C6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_E29960F25A20A91F8B932A57E2C861F4" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_36636969E28941D2224E2A57E2C61233" xlink:to="loc_us-gaap_RestructuringReserve_E29960F25A20A91F8B932A57E2C861F4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RevenueFromContractsWithCustomers" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_766A5D45D79FFA715CD3D7486A33C47D" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_3FEE95AFF22EB354DF25D7486A33FE7D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_766A5D45D79FFA715CD3D7486A33C47D" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_3FEE95AFF22EB354DF25D7486A33FE7D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RevenueFromContractsWithCustomersContractAssetsRollforwardDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_06FEF868B656F11A8645F098C5529EDA" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_FD7E92DDB9B9CD023CC6F098C552CEFF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_06FEF868B656F11A8645F098C5529EDA" xlink:to="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_FD7E92DDB9B9CD023CC6F098C552CEFF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostAxis" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_86DBB54CDBB814C75C42F098C552010D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_FD7E92DDB9B9CD023CC6F098C552CEFF" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_86DBB54CDBB814C75C42F098C552010D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostDomain" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_2D62EA033A8D679ACA4DF098C55236C0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_86DBB54CDBB814C75C42F098C552010D" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_2D62EA033A8D679ACA4DF098C55236C0" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CapitalizedCostToFulfillCustomerContractsMember" xlink:label="loc_aon_CapitalizedCostToFulfillCustomerContractsMember_1DE8B40EDE0451054995F098C553826F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_2D62EA033A8D679ACA4DF098C55236C0" xlink:to="loc_aon_CapitalizedCostToFulfillCustomerContractsMember_1DE8B40EDE0451054995F098C553826F" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CapitalizedCostToObtainCustomerContractsMember" xlink:label="loc_aon_CapitalizedCostToObtainCustomerContractsMember_5E8758E6594C2A61E028F098C553C7AE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_2D62EA033A8D679ACA4DF098C55236C0" xlink:to="loc_aon_CapitalizedCostToObtainCustomerContractsMember_5E8758E6594C2A61E028F098C553C7AE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_42933BEEDA00FB2534A1F098C5536EFC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_FD7E92DDB9B9CD023CC6F098C552CEFF" xlink:to="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_42933BEEDA00FB2534A1F098C5536EFC" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ChangeInCapitalizedContractCostsRollForward" xlink:label="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_42933BEEDA00FB2534A1F098C5536EFC" xlink:to="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet" xlink:label="loc_us-gaap_CapitalizedContractCostNet_92A9D3632F7A87244EF9F098C554CA7D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:to="loc_us-gaap_CapitalizedContractCostNet_92A9D3632F7A87244EF9F098C554CA7D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CapitalizedContractCostAdditions" xlink:label="loc_aon_CapitalizedContractCostAdditions_C8FAEF4089873792981AF098C55496ED" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:to="loc_aon_CapitalizedContractCostAdditions_C8FAEF4089873792981AF098C55496ED" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostAmortization" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_013409EAB0CA073E3CC9F098C554981A" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_013409EAB0CA073E3CC9F098C554981A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostImpairmentLoss" xlink:label="loc_us-gaap_CapitalizedContractCostImpairmentLoss_2C745ECD54CD13714CB1F098C554CA3A" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:to="loc_us-gaap_CapitalizedContractCostImpairmentLoss_2C745ECD54CD13714CB1F098C554CA3A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet" xlink:label="loc_aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet_F3E591473EADD4BB3519F098C554CCFF" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:to="loc_aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet_F3E591473EADD4BB3519F098C554CCFF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet" xlink:label="loc_us-gaap_CapitalizedContractCostNet_5D631B169F39E310846AF098C5551014" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_A059D4E3CA64D4A975CBF098C5537374" xlink:to="loc_us-gaap_CapitalizedContractCostNet_5D631B169F39E310846AF098C5551014" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RevenueFromContractsWithCustomersDisaggregationOfRevenueDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_0A0B4608AEB2B4230BDF32167DB92C5C" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_0A071B4F9531BE06D4C732167DBCC94B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_0A0B4608AEB2B4230BDF32167DB92C5C" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_0A071B4F9531BE06D4C732167DBCC94B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_D70B7FB5ABCEAB07704A32167DBDF864" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0A071B4F9531BE06D4C732167DBCC94B" xlink:to="loc_srt_ConsolidationItemsAxis_D70B7FB5ABCEAB07704A32167DBDF864" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_0985C8EC432BEF00328432167DBD6313" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_D70B7FB5ABCEAB07704A32167DBDF864" xlink:to="loc_srt_ConsolidationItemsDomain_0985C8EC432BEF00328432167DBD6313" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EliminationsAndReconcilingItemsMember" xlink:label="loc_aon_EliminationsAndReconcilingItemsMember_E8CF1EC8BEC1D24DBE0932195D190AA6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_0985C8EC432BEF00328432167DBD6313" xlink:to="loc_aon_EliminationsAndReconcilingItemsMember_E8CF1EC8BEC1D24DBE0932195D190AA6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_5FB974348B72A32BA81F32167DC07DD5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0A071B4F9531BE06D4C732167DBCC94B" xlink:to="loc_srt_ProductOrServiceAxis_5FB974348B72A32BA81F32167DC07DD5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_5FB974348B72A32BA81F32167DC07DD5" xlink:to="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_PCAdvisoryMember" xlink:label="loc_aon_PCAdvisoryMember_A0281FA56CCC5D194F7432167DC0672B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:to="loc_aon_PCAdvisoryMember_A0281FA56CCC5D194F7432167DC0672B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ReinsuranceMember" xlink:label="loc_aon_ReinsuranceMember_DFBFEB70AF5F8127CBEB32167DC16C5C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:to="loc_aon_ReinsuranceMember_DFBFEB70AF5F8127CBEB32167DC16C5C" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RetirementMember" xlink:label="loc_aon_RetirementMember_4FAC3FAA09A0DEBA7FFD32167DC17BF5" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:to="loc_aon_RetirementMember_4FAC3FAA09A0DEBA7FFD32167DC17BF5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_HealthMember" xlink:label="loc_aon_HealthMember_CAA63E15A665DAFAD84A32167DC14886" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:to="loc_aon_HealthMember_CAA63E15A665DAFAD84A32167DC14886" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DataSolutionsMember" xlink:label="loc_aon_DataSolutionsMember_5E012D44B11391B150B332167DC1645B" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_DA5D9F7B70E171242E9032167DC006DA" xlink:to="loc_aon_DataSolutionsMember_5E012D44B11391B150B332167DC1645B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_5076638E42598DA2D6B332167DC1CD65" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0A071B4F9531BE06D4C732167DBCC94B" xlink:to="loc_srt_StatementGeographicalAxis_5076638E42598DA2D6B332167DC1CD65" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_5076638E42598DA2D6B332167DC1CD65" xlink:to="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_4A4486BDC921CA14265632167DC229D2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:to="loc_country_US_4A4486BDC921CA14265632167DC229D2" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AmericasOtherthanUnitedStatesMember" xlink:label="loc_aon_AmericasOtherthanUnitedStatesMember_E4803642C87965E8D8E832167DC29ABB" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:to="loc_aon_AmericasOtherthanUnitedStatesMember_E4803642C87965E8D8E832167DC29ABB" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_B1542AAA7B5746C66CD132167DC2AFC5" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:to="loc_country_GB_B1542AAA7B5746C66CD132167DC2AFC5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EuropeMiddleEastAndAfricaMember" xlink:label="loc_aon_EuropeMiddleEastAndAfricaMember_76DBC7F3AD81EF2678E532167DC32C9F" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:to="loc_aon_EuropeMiddleEastAndAfricaMember_76DBC7F3AD81EF2678E532167DC32C9F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_AsiaPacificMember" xlink:label="loc_srt_AsiaPacificMember_29E44FAD93FCC372496632167DC34AF0" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_5E0F6BA5171DB9E2137A32167DC2CEAC" xlink:to="loc_srt_AsiaPacificMember_29E44FAD93FCC372496632167DC34AF0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_E162770633E6B155FB7032167DC3D458" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0A071B4F9531BE06D4C732167DBCC94B" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_E162770633E6B155FB7032167DC3D458" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_ADD5DF31EBCC0FCF1F4B32167DC383EC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_E162770633E6B155FB7032167DC3D458" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_ADD5DF31EBCC0FCF1F4B32167DC383EC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/RevenueFromContractsWithCustomersTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_BC0EA1D3AA2A01A78F82D74868D1DD73" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_063D38484E5161022434D74868D1F387" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_BC0EA1D3AA2A01A78F82D74868D1DD73" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_063D38484E5161022434D74868D1F387" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostTableTextBlock" xlink:label="loc_us-gaap_CapitalizedContractCostTableTextBlock_552A3F444FC9A5A7472FD74868D18292" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_BC0EA1D3AA2A01A78F82D74868D1DD73" xlink:to="loc_us-gaap_CapitalizedContractCostTableTextBlock_552A3F444FC9A5A7472FD74868D18292" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformation" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_642ADD53403FE9D76572D7486C0A79E4" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_EE1BF04CE5134CCCE407D7486C0AECB5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_642ADD53403FE9D76572D7486C0A79E4" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_EE1BF04CE5134CCCE407D7486C0AECB5" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformationNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_5D83CCFF7E1559266B88D7486900A676" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_E5733241E811FBAED297D74869002ED7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_5D83CCFF7E1559266B88D7486900A676" xlink:to="loc_us-gaap_NumberOfReportableSegments_E5733241E811FBAED297D74869002ED7" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NumberofRevenueLines" xlink:label="loc_aon_NumberofRevenueLines_339658DF163F772B17E8D7486900C4C5" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_5D83CCFF7E1559266B88D7486900A676" xlink:to="loc_aon_NumberofRevenueLines_339658DF163F772B17E8D7486900C4C5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_NumberOfPerformanceMetricsMeasured" xlink:label="loc_aon_NumberOfPerformanceMetricsMeasured_1B37DC06C61C2608A983D74869008302" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_5D83CCFF7E1559266B88D7486900A676" xlink:to="loc_aon_NumberOfPerformanceMetricsMeasured_1B37DC06C61C2608A983D74869008302" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformationScheduleOfConsolidatedNonCurrentAssetsByGeographicAreaDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_F0BC58DBCD16A9A9339B3EDFCF2136E7" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FB09F884115C2ECE35D23EDFCF212336" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_F0BC58DBCD16A9A9339B3EDFCF2136E7" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FB09F884115C2ECE35D23EDFCF212336" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_F5B600907911E5FF8B193EDFCF215323" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FB09F884115C2ECE35D23EDFCF212336" xlink:to="loc_srt_StatementGeographicalAxis_F5B600907911E5FF8B193EDFCF215323" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_F5B600907911E5FF8B193EDFCF215323" xlink:to="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_A3BAFF1AB646652D25653EDFCF21ADDF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:to="loc_country_US_A3BAFF1AB646652D25653EDFCF21ADDF" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_AmericasOtherthanUnitedStatesMember" xlink:label="loc_aon_AmericasOtherthanUnitedStatesMember_F8FEF2E89E6430177E703EDFCF211FC3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:to="loc_aon_AmericasOtherthanUnitedStatesMember_F8FEF2E89E6430177E703EDFCF211FC3" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_58BB2A8F2C3EDD73AE123EDFCF217300" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:to="loc_country_GB_58BB2A8F2C3EDD73AE123EDFCF217300" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EMEAMember" xlink:label="loc_us-gaap_EMEAMember_9B3E58006E85BFE57D433EDFCF2179AA" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:to="loc_us-gaap_EMEAMember_9B3E58006E85BFE57D433EDFCF2179AA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_AsiaPacificMember" xlink:label="loc_srt_AsiaPacificMember_B9E7E522238AD56D3F1F3EDFCF21FC46" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_9CD29ADF02A74FF0D9E93EDFCF2174D2" xlink:to="loc_srt_AsiaPacificMember_B9E7E522238AD56D3F1F3EDFCF21FC46" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5C1A8EF6BC3F0F49CD883EDFCF212B84" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FB09F884115C2ECE35D23EDFCF212336" xlink:to="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5C1A8EF6BC3F0F49CD883EDFCF212B84" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization" xlink:label="loc_aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization_EDA44F16A4319C279F353EDFCF21F0F4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5C1A8EF6BC3F0F49CD883EDFCF212B84" xlink:to="loc_aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization_EDA44F16A4319C279F353EDFCF21F0F4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_CDAA3E9AB79F9B57B3B73EE3C04671F4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5C1A8EF6BC3F0F49CD883EDFCF212B84" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_CDAA3E9AB79F9B57B3B73EE3C04671F4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformationTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_2FF1D2CB5BE8F5BA88093A0F9A3D392B" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock" xlink:label="loc_us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock_3EDC9FD448E65B3E15003A0F9A3D391B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_2FF1D2CB5BE8F5BA88093A0F9A3D392B" xlink:to="loc_us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock_3EDC9FD448E65B3E15003A0F9A3D391B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlans" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9F04E50B91E5BA047C28254661C5671E" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_33C297417A63EFEAC991254661C5CDC9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9F04E50B91E5BA047C28254661C5671E" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_33C297417A63EFEAC991254661C5CDC9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansPerformanceShareAwardsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BC848C8A2B2D06406A8A20723FE298D6" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45FD93E511FF5ABC5C1320723FE25828" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BC848C8A2B2D06406A8A20723FE298D6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45FD93E511FF5ABC5C1320723FE25828" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_C6CC2D93B55153A501BF20723FE31189" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45FD93E511FF5ABC5C1320723FE25828" xlink:to="loc_us-gaap_PlanNameAxis_C6CC2D93B55153A501BF20723FE31189" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_791B596263A64C4F4A5920723FE32F07" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_C6CC2D93B55153A501BF20723FE31189" xlink:to="loc_us-gaap_PlanNameDomain_791B596263A64C4F4A5920723FE32F07" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LeadershipPerformancePlanCycle20142016Member" xlink:label="loc_aon_LeadershipPerformancePlanCycle20142016Member_A81099A53BF59B34100B20723FE31457" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_791B596263A64C4F4A5920723FE32F07" xlink:to="loc_aon_LeadershipPerformancePlanCycle20142016Member_A81099A53BF59B34100B20723FE31457" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LeadershipPerformancePlanCycle20132015Member" xlink:label="loc_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_791B596263A64C4F4A5920723FE32F07" xlink:to="loc_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_LeadershipPerformancePlanCycle20122014Member" xlink:label="loc_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_791B596263A64C4F4A5920723FE32F07" xlink:to="loc_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_E1986321608C2CBCE51320723FE497B0" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45FD93E511FF5ABC5C1320723FE25828" xlink:to="loc_us-gaap_AwardTypeAxis_E1986321608C2CBCE51320723FE497B0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_564C999DBA8C10C3956920723FE4A3B9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_E1986321608C2CBCE51320723FE497B0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_564C999DBA8C10C3956920723FE4A3B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_2B4B38AEC61DE4D382B120723FE4839B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_564C999DBA8C10C3956920723FE4A3B9" xlink:to="loc_us-gaap_PerformanceSharesMember_2B4B38AEC61DE4D382B120723FE4839B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_0C39469BC5798AC0BB7C20723FE42FA6" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45FD93E511FF5ABC5C1320723FE25828" xlink:to="loc_srt_RangeAxis_0C39469BC5798AC0BB7C20723FE42FA6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_77DBCF4B4FD2836701E720723FE5BC11" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_0C39469BC5798AC0BB7C20723FE42FA6" xlink:to="loc_srt_RangeMember_77DBCF4B4FD2836701E720723FE5BC11" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_7A9827A8C1C7FC35CE9220723FE52609" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_77DBCF4B4FD2836701E720723FE5BC11" xlink:to="loc_srt_MinimumMember_7A9827A8C1C7FC35CE9220723FE52609" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_CB2831AAFBE3225AD59620723FE5FEAA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_77DBCF4B4FD2836701E720723FE5BC11" xlink:to="loc_srt_MaximumMember_CB2831AAFBE3225AD59620723FE5FEAA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B6EA31387BA49A74FD7820723FE5FF32" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45FD93E511FF5ABC5C1320723FE25828" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B6EA31387BA49A74FD7820723FE5FF32" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod" xlink:label="loc_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B6EA31387BA49A74FD7820723FE5FF32" xlink:to="loc_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent" xlink:label="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_A50899BD2BE4750A4B1420723FE6D770" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B6EA31387BA49A74FD7820723FE5FF32" xlink:to="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_A50899BD2BE4750A4B1420723FE6D770" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_823B606EF8529737500F20723FE6AF04" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B6EA31387BA49A74FD7820723FE5FF32" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_823B606EF8529737500F20723FE6AF04" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansRestrictedShareUnitsNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_8CD7EF5A42DFBEB7F01B20723FF159FB" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9AA90F4DA7BF6604459420723FF191B9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_8CD7EF5A42DFBEB7F01B20723FF159FB" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9AA90F4DA7BF6604459420723FF191B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_FA24BEAB87C22E299B6820723FF2D1FC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9AA90F4DA7BF6604459420723FF191B9" xlink:to="loc_us-gaap_AwardTypeAxis_FA24BEAB87C22E299B6820723FF2D1FC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C4CF11D0A3326450D41D20723FF2EF3C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_FA24BEAB87C22E299B6820723FF2D1FC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C4CF11D0A3326450D41D20723FF2EF3C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_C2A866DD0D472F642FB820723FF2D448" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C4CF11D0A3326450D41D20723FF2EF3C" xlink:to="loc_us-gaap_PerformanceSharesMember_C2A866DD0D472F642FB820723FF2D448" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_1BDBB60A3DCE3FFD8F8220723FF29B39" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C4CF11D0A3326450D41D20723FF2EF3C" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_1BDBB60A3DCE3FFD8F8220723FF29B39" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_D1463225C61DC8791BB020723FF325D9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9AA90F4DA7BF6604459420723FF191B9" xlink:to="loc_srt_RangeAxis_D1463225C61DC8791BB020723FF325D9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_383191E06B1D20FE0E0520723FF3BD1D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_D1463225C61DC8791BB020723FF325D9" xlink:to="loc_srt_RangeMember_383191E06B1D20FE0E0520723FF3BD1D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_5C86BD9C4DF11993E29C20723FF32DF4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_383191E06B1D20FE0E0520723FF3BD1D" xlink:to="loc_srt_MinimumMember_5C86BD9C4DF11993E29C20723FF32DF4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_A2B7EE0213406D76843720723FF3E808" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_383191E06B1D20FE0E0520723FF3BD1D" xlink:to="loc_srt_MaximumMember_A2B7EE0213406D76843720723FF3E808" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F66ABBAE52EE4492711C20723FF32A61" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9AA90F4DA7BF6604459420723FF191B9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F66ABBAE52EE4492711C20723FF32A61" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_E0752DC9603F419C70D720723FF4782E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F66ABBAE52EE4492711C20723FF32A61" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_E0752DC9603F419C70D720723FF4782E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_088AEDB43027D6C0368C20723FF4BE6C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F66ABBAE52EE4492711C20723FF32A61" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_088AEDB43027D6C0368C20723FF4BE6C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_01B4A2190D315A2E06DC20723FF46F1B" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F66ABBAE52EE4492711C20723FF32A61" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_01B4A2190D315A2E06DC20723FF46F1B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_6F946EA2340C5B83BD6A20723FF4A408" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F66ABBAE52EE4492711C20723FF32A61" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_6F946EA2340C5B83BD6A20723FF4A408" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansScheduleOfPerformanceBasedPlansDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_4375EEF2146A012839DD20723FDC0F3B" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_20C25F25BC22D4455E5E20723FDD102A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_4375EEF2146A012839DD20723FDC0F3B" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_20C25F25BC22D4455E5E20723FDD102A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_DED24106DB30D13532B920723FDD5496" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_20C25F25BC22D4455E5E20723FDD102A" xlink:to="loc_us-gaap_AwardTypeAxis_DED24106DB30D13532B920723FDD5496" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F658CD208B681AFA913B20723FDDD8CD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_DED24106DB30D13532B920723FDD5496" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F658CD208B681AFA913B20723FDDD8CD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_6CAD597242F0C314C67220723FDD433E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F658CD208B681AFA913B20723FDDD8CD" xlink:to="loc_us-gaap_PerformanceSharesMember_6CAD597242F0C314C67220723FDD433E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B45ADBDC27AFB4B3EC20723FDEF3AA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_20C25F25BC22D4455E5E20723FDD102A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B45ADBDC27AFB4B3EC20723FDEF3AA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BA54F27DFC782836E05220723FDE8AB5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B45ADBDC27AFB4B3EC20723FDEF3AA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BA54F27DFC782836E05220723FDE8AB5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5D8DBC89862DCD6A69F320723FDE251B" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B45ADBDC27AFB4B3EC20723FDEF3AA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5D8DBC89862DCD6A69F320723FDE251B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable" xlink:label="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_BD9E741D7C53040C481420723FDE373A" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B45ADBDC27AFB4B3EC20723FDEF3AA" xlink:to="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_BD9E741D7C53040C481420723FDE373A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_UnamortizedExpenseOnPerformanceBasedPlans" xlink:label="loc_aon_UnamortizedExpenseOnPerformanceBasedPlans_9CF50E99DF206A0B015E20723FDE6B9E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B45ADBDC27AFB4B3EC20723FDEF3AA" xlink:to="loc_aon_UnamortizedExpenseOnPerformanceBasedPlans_9CF50E99DF206A0B015E20723FDE6B9E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansShareBasedCompensationExpenseRecognizedInContinuingOperationsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_B4752FCEE22EAC3CBFEC20723FF83205" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56DEC39AAD4761A16A2520723FF85540" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_B4752FCEE22EAC3CBFEC20723FF83205" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56DEC39AAD4761A16A2520723FF85540" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9EE6F4CE259CDAE7D23520723FF9CBB2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56DEC39AAD4761A16A2520723FF85540" xlink:to="loc_us-gaap_AwardTypeAxis_9EE6F4CE259CDAE7D23520723FF9CBB2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BB99D41259A33D71D92920723FF90DF6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_9EE6F4CE259CDAE7D23520723FF9CBB2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BB99D41259A33D71D92920723FF90DF6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_08A1EDB97DD1C150716D20723FF93C43" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BB99D41259A33D71D92920723FF90DF6" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_08A1EDB97DD1C150716D20723FF93C43" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_1452B3543C6F3BEB6F2720723FFA6A81" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BB99D41259A33D71D92920723FF90DF6" xlink:to="loc_us-gaap_PerformanceSharesMember_1452B3543C6F3BEB6F2720723FFA6A81" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_D4EE1839EC879C81CDBB20723FFA8F42" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56DEC39AAD4761A16A2520723FF85540" xlink:to="loc_us-gaap_PlanNameAxis_D4EE1839EC879C81CDBB20723FFA8F42" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_25C1EA368CD830D31EC920723FFAB92D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_D4EE1839EC879C81CDBB20723FFA8F42" xlink:to="loc_us-gaap_PlanNameDomain_25C1EA368CD830D31EC920723FFAB92D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_EmployeeStockPurchasePlanMember" xlink:label="loc_aon_EmployeeStockPurchasePlanMember_7AF3B0FFC03AB1EE0CCB20723FFA40A0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_25C1EA368CD830D31EC920723FFAB92D" xlink:to="loc_aon_EmployeeStockPurchasePlanMember_7AF3B0FFC03AB1EE0CCB20723FFA40A0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ACD867FB2D6EF6D0565720723FFAA210" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56DEC39AAD4761A16A2520723FF85540" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ACD867FB2D6EF6D0565720723FFAA210" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_C32E4B76D14CDAAD14A120723FFBCE50" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ACD867FB2D6EF6D0565720723FFAA210" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_C32E4B76D14CDAAD14A120723FFBCE50" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_F1F5AC2395E70BDE12A520723FFB3AAE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ACD867FB2D6EF6D0565720723FFAA210" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_F1F5AC2395E70BDE12A520723FFB3AAE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_5F445E4779B90F0BC9CB20723FFBC864" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ACD867FB2D6EF6D0565720723FFAA210" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_5F445E4779B90F0BC9CB20723FFBC864" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansSummaryOfStatusOfCompanysRsusDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_6BD42D9A1EF0904DA3DE20723FEA5593" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_33E553BC1056DD247DD120723FEA3D95" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_6BD42D9A1EF0904DA3DE20723FEA5593" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_33E553BC1056DD247DD120723FEA3D95" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_8E73223BB34DDDEABA7320723FEAD66C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_33E553BC1056DD247DD120723FEA3D95" xlink:to="loc_us-gaap_AwardTypeAxis_8E73223BB34DDDEABA7320723FEAD66C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3E146DB766FAE00C93F220723FEA92F4" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_8E73223BB34DDDEABA7320723FEAD66C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3E146DB766FAE00C93F220723FEA92F4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_AC99916FB7A8374B2F2120723FEB6F62" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3E146DB766FAE00C93F220723FEA92F4" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_AC99916FB7A8374B2F2120723FEB6F62" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B8994A4656DECD31D4120723FEB1FB9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_33E553BC1056DD247DD120723FEA3D95" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B8994A4656DECD31D4120723FEB1FB9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B8994A4656DECD31D4120723FEB1FB9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7D60488EC42EADD9D82520723FEBF94B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7D60488EC42EADD9D82520723FEBF94B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_62DC3123A0FD987C203220723FECF66E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_62DC3123A0FD987C203220723FECF66E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0467FD5F43558CC261AF20723FEC1F45" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0467FD5F43558CC261AF20723FEC1F45" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_E2C0DB3061DA240357C220723FECFAFE" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_E2C0DB3061DA240357C220723FECFAFE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9CADE90EFF36CB6A5F5820723FECC54E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_F8FEC4436F0B650B5C4E20723FEBA104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9CADE90EFF36CB6A5F5820723FECC54E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B8994A4656DECD31D4120723FEB1FB9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_D823F39CACE4DD32E35D20723FECF191" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_D823F39CACE4DD32E35D20723FECF191" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_FA89CBEB6AA2400395D620723FED155D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_FA89CBEB6AA2400395D620723FED155D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_D08A36207C5C47CF0C5F20723FEDDFB4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_D08A36207C5C47CF0C5F20723FEDDFB4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_6C1FAC1443289A62B5D920723FED84C1" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_6C1FAC1443289A62B5D920723FED84C1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_8F0769D03AC2AAF822B120723FED009E" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_09DB1F3E4A800CCEFEC220723FECAA53" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_8F0769D03AC2AAF822B120723FED009E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_58019F9785B28D4B979520723FFEE6A3" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_272D0E2B994DA95FA55A20723FFEDDFD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_58019F9785B28D4B979520723FFEE6A3" xlink:to="loc_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_272D0E2B994DA95FA55A20723FFEDDFD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_FC3104F4416A5381E00A20723FFEEFCE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_58019F9785B28D4B979520723FFEE6A3" xlink:to="loc_us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_FC3104F4416A5381E00A20723FFEEFCE" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ScheduleofPerformanceBasedPlansTableTextBlock" xlink:label="loc_aon_ScheduleofPerformanceBasedPlansTableTextBlock_591A7E02D1E6A9FE8E5020723FFEF009" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_58019F9785B28D4B979520723FFEE6A3" xlink:to="loc_aon_ScheduleofPerformanceBasedPlansTableTextBlock_591A7E02D1E6A9FE8E5020723FFEF009" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquity" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_21079370874E6F5CB999D74868A340F0" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_980921AE918855653572D74868A3B678" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_21079370874E6F5CB999D74868A340F0" xlink:to="loc_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_980921AE918855653572D74868A3B678" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityComponentsOfAccumulatedOtherComprehensiveLossNetOfRelatedTaxDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_7D49E4B0986B8CF9B74A3A83D65D23BC" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_3AAF218461A5D40DA08E3A83D65DE055" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_7D49E4B0986B8CF9B74A3A83D65D23BC" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_3AAF218461A5D40DA08E3A83D65DE055" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6E3072CF7EE56BA91AE33A83D65E49ED" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_3AAF218461A5D40DA08E3A83D65DE055" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6E3072CF7EE56BA91AE33A83D65E49ED" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_A83C3FDAC3B550C8E3EE3A83D65EACF9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6E3072CF7EE56BA91AE33A83D65E49ED" xlink:to="loc_us-gaap_EquityComponentDomain_A83C3FDAC3B550C8E3EE3A83D65EACF9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_44AF07E92A9247D8C4323A83D65F8457" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A83C3FDAC3B550C8E3EE3A83D65EACF9" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_44AF07E92A9247D8C4323A83D65F8457" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_D90B516710E1E095E6B63A83D65F9FBC" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A83C3FDAC3B550C8E3EE3A83D65EACF9" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_D90B516710E1E095E6B63A83D65F9FBC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_B72297C0211B0E2B5E5D3A83D65FD1F4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A83C3FDAC3B550C8E3EE3A83D65EACF9" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_B72297C0211B0E2B5E5D3A83D65FD1F4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5B98C27BA685354BB7103A83D65FAF35" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A83C3FDAC3B550C8E3EE3A83D65EACF9" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5B98C27BA685354BB7103A83D65FAF35" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D1C593DF6B80510DF6423A83D660667C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_3AAF218461A5D40DA08E3A83D65DE055" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D1C593DF6B80510DF6423A83D660667C" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward" xlink:label="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D1C593DF6B80510DF6423A83D660667C" xlink:to="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_F6D69E311FC9B21179183A83D66019B8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_F6D69E311FC9B21179183A83D66019B8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_F249FB559634462B58D73A83D661E515" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_F249FB559634462B58D73A83D661E515" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1_365D5FF7F542ABFD236A3A83D6615BD7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1_365D5FF7F542ABFD236A3A83D6615BD7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_C8C13529DF6F5E1924A63A9A376BB22E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_C8C13529DF6F5E1924A63A9A376BB22E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_779DB5CC2373DF7753903A83D661AAC4" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_779DB5CC2373DF7753903A83D661AAC4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_E2F57752B83B4C5B687D3A9B50ED64D3" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_E2F57752B83B4C5B687D3A9B50ED64D3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_73AD49ED9B5DE70807A63A9960277832" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_73AD49ED9B5DE70807A63A9960277832" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_31AC0B093BE75F275D9B3A83D6620554" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_31AC0B093BE75F275D9B3A83D6620554" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_2172E6DCD71113D523BC3A9653927723" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_2172E6DCD71113D523BC3A9653927723" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_AE66855FEB405B7702503A83D6622873" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_AE66855FEB405B7702503A83D6622873" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0BEA98CA0D86DC62A11A3A83D6629C0E" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_B9A7C6E2B856E56DA5623A83D6605955" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0BEA98CA0D86DC62A11A3A83D6629C0E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityDistributableReservesNarrativeDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_FF8ECB04297ACF3374E71550F59D8A0E" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_DistributableReservesAvailableAmount" xlink:label="loc_aon_DistributableReservesAvailableAmount_C57F8CB28DA800544C5E1550F59D51F5" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_FF8ECB04297ACF3374E71550F59D8A0E" xlink:to="loc_aon_DistributableReservesAvailableAmount_C57F8CB28DA800544C5E1550F59D51F5" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityDividendsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_B726AA037E5E3979549CD7486835B435" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_F889FCD99E5BBC8BA700D748683566BD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_B726AA037E5E3979549CD7486835B435" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_F889FCD99E5BBC8BA700D748683566BD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_D15545B12F35F2127B03D7486835938E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_B726AA037E5E3979549CD7486835B435" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_D15545B12F35F2127B03D7486835938E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityOrdinarySharesDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract_287D6484254DF57AE311D7486D0FF676" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OrdinaryShareProgramsTable" xlink:label="loc_aon_OrdinaryShareProgramsTable_BF3D807752E10E8E030ED7486D0F6DF8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract_287D6484254DF57AE311D7486D0FF676" xlink:to="loc_aon_OrdinaryShareProgramsTable_BF3D807752E10E8E030ED7486D0F6DF8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_D178A74F043BC9877532D7486D0FDDC6" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OrdinaryShareProgramsTable_BF3D807752E10E8E030ED7486D0F6DF8" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_D178A74F043BC9877532D7486D0FDDC6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_6A8C060FB3FC6D402EB3D7486D10B43A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_D178A74F043BC9877532D7486D0FDDC6" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_6A8C060FB3FC6D402EB3D7486D10B43A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ShareRepurchaseProgramOf2012Member" xlink:label="loc_aon_ShareRepurchaseProgramOf2012Member_30AE53C09B1BA0CE7141D7486D109732" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_6A8C060FB3FC6D402EB3D7486D10B43A" xlink:to="loc_aon_ShareRepurchaseProgramOf2012Member_30AE53C09B1BA0CE7141D7486D109732" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ShareRepurchaseProgramof2014Member" xlink:label="loc_aon_ShareRepurchaseProgramof2014Member_BAF3E630BF50DFAC8DD2D7486D10FCE4" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_6A8C060FB3FC6D402EB3D7486D10B43A" xlink:to="loc_aon_ShareRepurchaseProgramof2014Member_BAF3E630BF50DFAC8DD2D7486D10FCE4" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_ShareRepurchaseProgramOf2017Member" xlink:label="loc_aon_ShareRepurchaseProgramOf2017Member_E5006CBBDEBD0852A43AD7486D10D5C3" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_6A8C060FB3FC6D402EB3D7486D10B43A" xlink:to="loc_aon_ShareRepurchaseProgramOf2017Member_E5006CBBDEBD0852A43AD7486D10D5C3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CommonStockProgramsLineItems" xlink:label="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OrdinaryShareProgramsTable_BF3D807752E10E8E030ED7486D0F6DF8" xlink:to="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_9E514C5F54BF380F6BE6D7486D117C1F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_9E514C5F54BF380F6BE6D7486D117C1F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_47F73CFDE8DB52CDE3C2D7486D11B22C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_47F73CFDE8DB52CDE3C2D7486D11B22C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_B7CC706AECBF18F1F330D7486D1145D8" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_B7CC706AECBF18F1F330D7486D1145D8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquityAbstract" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_659F433988355BD4873ED7486D11946E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_659F433988355BD4873ED7486D11946E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_E22418D7496EC52B8001D7486D119E50" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_659F433988355BD4873ED7486D11946E" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_E22418D7496EC52B8001D7486D119E50" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TreasuryStockAcquiredAdditionalTransactionCosts" xlink:label="loc_aon_TreasuryStockAcquiredAdditionalTransactionCosts_AA331E0381A3163308CDD7486D127109" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_659F433988355BD4873ED7486D11946E" xlink:to="loc_aon_TreasuryStockAcquiredAdditionalTransactionCosts_AA331E0381A3163308CDD7486D127109" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts" xlink:label="loc_aon_TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts_C14BB5EE4115C3548D1DD7486D1280A7" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_659F433988355BD4873ED7486D11946E" xlink:to="loc_aon_TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts_C14BB5EE4115C3548D1DD7486D1280A7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_D52F8A687D5F21517A8DD7486D122B8F" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_A3F8268D01E629EBEDA9D7486D10D73D" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_D52F8A687D5F21517A8DD7486D122B8F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityScheduleOfWeightedAverageSharesOutstandingDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_BC3F2CB2F7919B09F8F3321A14AD77C4" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_0C4EC84AAA7C544ADACB321A14AEED79" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_BC3F2CB2F7919B09F8F3321A14AD77C4" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_0C4EC84AAA7C544ADACB321A14AEED79" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_571745B8BF45E0870894321A14AE15C9" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_BC3F2CB2F7919B09F8F3321A14AD77C4" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_571745B8BF45E0870894321A14AE15C9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_6E349EF2FDD7A09FF1E9321A14AEA85F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_BC3F2CB2F7919B09F8F3321A14AD77C4" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_6E349EF2FDD7A09FF1E9321A14AEA85F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_89DB006BD23F2B922A5E321A14AE863E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_BC3F2CB2F7919B09F8F3321A14AD77C4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_89DB006BD23F2B922A5E321A14AE863E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_F8131BE231EEE8C7F9EDD7486864A999" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRepurchaseAgreements" xlink:label="loc_us-gaap_ScheduleOfRepurchaseAgreements_92B5B41BAEC6480CD7DBD7486864598D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_F8131BE231EEE8C7F9EDD7486864A999" xlink:to="loc_us-gaap_ScheduleOfRepurchaseAgreements_92B5B41BAEC6480CD7DBD7486864598D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_C6AB9BAE655532DC5378D74868648BFF" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_F8131BE231EEE8C7F9EDD7486864A999" xlink:to="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_C6AB9BAE655532DC5378D74868648BFF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_4DE9BBD73DC4D480B68BD7486864677F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_F8131BE231EEE8C7F9EDD7486864A999" xlink:to="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_4DE9BBD73DC4D480B68BD7486864677F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPractices" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_17895FAC3C6157EB75509790FCD97EC0" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="loc_us-gaap_SignificantAccountingPoliciesTextBlock_108E75C9DBE39BD34D78987CD83BE69B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_17895FAC3C6157EB75509790FCD97EC0" xlink:to="loc_us-gaap_SignificantAccountingPoliciesTextBlock_108E75C9DBE39BD34D78987CD83BE69B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesAdditionalInformationDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_8D66E4F00AFEAE3F4593321A1623C1F0" xlink:type="locator"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SummaryOfSignificantAccountingPoliciesTable" xlink:label="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_8D66E4F00AFEAE3F4593321A1623C1F0" xlink:to="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3C9F790DC1DBA1E604E4321A16237FA7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3C9F790DC1DBA1E604E4321A16237FA7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A931F10BAD68FFD02D74321A1623108C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3C9F790DC1DBA1E604E4321A16237FA7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A931F10BAD68FFD02D74321A1623108C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_6F4E50EFD3BE2B79C0A5321A1624057B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A931F10BAD68FFD02D74321A1623108C" xlink:to="loc_us-gaap_TradeNamesMember_6F4E50EFD3BE2B79C0A5321A1624057B" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CustomerRelatedAndContractBasedMember" xlink:label="loc_aon_CustomerRelatedAndContractBasedMember_6649D0CD7EF654FEA00A321A1624D33D" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A931F10BAD68FFD02D74321A1623108C" xlink:to="loc_aon_CustomerRelatedAndContractBasedMember_6649D0CD7EF654FEA00A321A1624D33D" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_MarketingTechnologyAndOtherMember" xlink:label="loc_aon_MarketingTechnologyAndOtherMember_B25965382BD2B7F1438C321A16245C48" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A931F10BAD68FFD02D74321A1623108C" xlink:to="loc_aon_MarketingTechnologyAndOtherMember_B25965382BD2B7F1438C321A16245C48" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_B4F8A4C8119D27145408321A1624F81E" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_B4F8A4C8119D27145408321A1624F81E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_B2E96E16BEA603067EB3321A16241DDF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_B4F8A4C8119D27145408321A1624F81E" xlink:to="loc_us-gaap_TypeOfAdoptionMember_B2E96E16BEA603067EB3321A16241DDF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_8E8148155A7C5615AE12321A16257510" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfAdoptionMember_B2E96E16BEA603067EB3321A16241DDF" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_8E8148155A7C5615AE12321A16257510" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201409Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201409Member_9604623C1543E3BB71B6321A162599AA" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfAdoptionMember_B2E96E16BEA603067EB3321A16241DDF" xlink:to="loc_us-gaap_AccountingStandardsUpdate201409Member_9604623C1543E3BB71B6321A162599AA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201613Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201613Member_374DD24D7CE10676E7AE322707937FE4" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfAdoptionMember_B2E96E16BEA603067EB3321A16241DDF" xlink:to="loc_us-gaap_AccountingStandardsUpdate201613Member_374DD24D7CE10676E7AE322707937FE4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_44FAC3A7D43AB4A01C6B321A16250835" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:to="loc_srt_RangeAxis_44FAC3A7D43AB4A01C6B321A16250835" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_F2070D6919FA0A00DEA3321A16251B16" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_44FAC3A7D43AB4A01C6B321A16250835" xlink:to="loc_srt_RangeMember_F2070D6919FA0A00DEA3321A16251B16" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_1640201F6B3DFC05F3E2321A162626CF" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_F2070D6919FA0A00DEA3321A16251B16" xlink:to="loc_srt_MinimumMember_1640201F6B3DFC05F3E2321A162626CF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_0A1C85B27DDCE15B4ABF321A1626AB71" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_F2070D6919FA0A00DEA3321A16251B16" xlink:to="loc_srt_MaximumMember_0A1C85B27DDCE15B4ABF321A1626AB71" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_C83073CC58C01CDC77F8321A16269905" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_C83073CC58C01CDC77F8321A16269905" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_C83073CC58C01CDC77F8321A16269905" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_4EFB0792D5E1DDCE85F5321A162717B1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_4EFB0792D5E1DDCE85F5321A162717B1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_8A0C8C3165EA101AA119321A162744C1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_8A0C8C3165EA101AA119321A162744C1" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FurnitureFixturesAndEquipmentMember" xlink:label="loc_aon_FurnitureFixturesAndEquipmentMember_B369CBD4ED00E600F94C321A1627FA38" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:to="loc_aon_FurnitureFixturesAndEquipmentMember_B369CBD4ED00E600F94C321A1627FA38" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_9D79ECFBA9224A3E1900321A1627B58D" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:to="loc_us-gaap_ComputerEquipmentMember_9D79ECFBA9224A3E1900321A1627B58D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_3E99A09D408B627A843F321A16278710" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:to="loc_us-gaap_BuildingMember_3E99A09D408B627A843F321A16278710" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AutomobilesMember" xlink:label="loc_us-gaap_AutomobilesMember_83F052DD0308BD80E13B321A1627E860" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9E95C3BF22482F25D71D321A1626A015" xlink:to="loc_us-gaap_AutomobilesMember_83F052DD0308BD80E13B321A1627E860" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_58D63977DDFA747686DD322673A84D26" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_58D63977DDFA747686DD322673A84D26" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_8733933C2EB319392275322673B8D010" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_58D63977DDFA747686DD322673A84D26" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_8733933C2EB319392275322673B8D010" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_50B6736DB3FCD39B599C32269DC09D67" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_8733933C2EB319392275322673B8D010" xlink:to="loc_us-gaap_SubsequentEventMember_50B6736DB3FCD39B599C32269DC09D67" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_C799E3343D9D214AA6B9321A16231577" xlink:to="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAbstract" xlink:label="loc_us-gaap_CashAndCashEquivalentsAbstract_19A9A1783E4663D7D8D4321A16284353" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:to="loc_us-gaap_CashAndCashEquivalentsAbstract_19A9A1783E4663D7D8D4321A16284353" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CashandCashEquivalentsandShortTermInvestments" xlink:label="loc_aon_CashandCashEquivalentsandShortTermInvestments_333396045A235587C192321A1628D7A3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_19A9A1783E4663D7D8D4321A16284353" xlink:to="loc_aon_CashandCashEquivalentsandShortTermInvestments_333396045A235587C192321A1628D7A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCashAndInvestmentsCurrent" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_EE9CAA74C5937089C4D7321A1628C4A3" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_19A9A1783E4663D7D8D4321A16284353" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_EE9CAA74C5937089C4D7321A1628C4A3" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_RestrictedCashOperatingFunds" xlink:label="loc_aon_RestrictedCashOperatingFunds_7C51D824500B8B64A86D321A16280BFD" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_19A9A1783E4663D7D8D4321A16284353" xlink:to="loc_aon_RestrictedCashOperatingFunds_7C51D824500B8B64A86D321A16280BFD" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryAssetsAndLiabilitiesAbstract" xlink:label="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:to="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryAssetsPremiumTrustBalances" xlink:label="loc_aon_FiduciaryAssetsPremiumTrustBalances_42D34AA4D252ECFAE39F321A1629F826" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:to="loc_aon_FiduciaryAssetsPremiumTrustBalances_42D34AA4D252ECFAE39F321A1629F826" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetAbstract" xlink:label="loc_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:to="loc_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_F378761A5BE01389E2E1321A1629D0D8" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_F378761A5BE01389E2E1321A1629D0D8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_FiniteLivedIntangibleAssetAbstract" xlink:label="loc_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:to="loc_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:label="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_782C3F0CE4144813CA41321A162871B3" xlink:to="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_981F1E3292C16EA7F2C2321A162B7ADE" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:to="loc_us-gaap_OperatingLeaseLiability_981F1E3292C16EA7F2C2321A162B7ADE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_B8F2BA4FFD608DA1FDF8321A162B38C1" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_B8F2BA4FFD608DA1FDF8321A162B38C1" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesPolicies" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5E1AB7C36E01F340361C43EF141FD593" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5E1AB7C36E01F340361C43EF141FD593" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_E3E1CFB871B915137C1243EF141FDD1C" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_UseOfEstimates_E3E1CFB871B915137C1243EF141FDD1C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerPolicyTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_0EA38B27BFAD9BA98D9343EF141F172F" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_0EA38B27BFAD9BA98D9343EF141F172F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationRelatedCostsPolicyTextBlock" xlink:label="loc_us-gaap_CompensationRelatedCostsPolicyTextBlock_F446F3FBDD453358D72C43EF141F5C07" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_CompensationRelatedCostsPolicyTextBlock_F446F3FBDD453358D72C43EF141F5C07" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementPlansPensionsPolicy" xlink:label="loc_us-gaap_PensionAndOtherPostretirementPlansPensionsPolicy_E7558044AADE05DC83BC43EF141F21E7" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_PensionAndOtherPostretirementPlansPensionsPolicy_E7558044AADE05DC83BC43EF141F21E7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_7659AEBC709F1478009943EF141FBFD8" xlink:type="locator"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_EarningsPerSharePolicyTextBlock_7659AEBC709F1478009943EF141FBFD8" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_CashCashEquivalentsAndShortTermInvestmentsPolicyTextBlock" xlink:label="loc_aon_CashCashEquivalentsAndShortTermInvestmentsPolicyTextBlock_19E3B5156ADDDE4E558143EF141F3841" xlink:type="locator"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_aon_CashCashEquivalentsAndShortTermInvestmentsPolicyTextBlock_19E3B5156ADDDE4E558143EF141F3841" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialAssetsServicingOfFinancialAssetsPolicy" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialAssetsServicingOfFinancialAssetsPolicy_F0247C2663B081823D1343EF141FC633" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialAssetsServicingOfFinancialAssetsPolicy_F0247C2663B081823D1343EF141FC633" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeAndOtherAccountsReceivablePolicy" xlink:label="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_8296F85B55CA1EC1A35643EF141F6E44" xlink:type="locator"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_8296F85B55CA1EC1A35643EF141F6E44" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_E7AF4814BED592422CCC43EF141FB5DD" xlink:type="locator"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_E7AF4814BED592422CCC43EF141FB5DD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_E8EA439242EE97CA798543EF141FA593" xlink:type="locator"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_E8EA439242EE97CA798543EF141FA593" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativesPolicyTextBlock" xlink:label="loc_us-gaap_DerivativesPolicyTextBlock_D67B398CFC7CB268FF5043EF141F3CDC" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_DerivativesPolicyTextBlock_D67B398CFC7CB268FF5043EF141F3CDC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_C4AE5EF2C321175A864243EF141F375B" xlink:type="locator"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_C4AE5EF2C321175A864243EF141F375B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_E8DA2DBFA1FBFE0BE55843EF141FA8AF" xlink:type="locator"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_IncomeTaxPolicyTextBlock_E8DA2DBFA1FBFE0BE55843EF141FA8AF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorLeasesPolicyTextBlock" xlink:label="loc_us-gaap_LessorLeasesPolicyTextBlock_8509F7113BA24895B3AA43F80B07B561" xlink:type="locator"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_LessorLeasesPolicyTextBlock_8509F7113BA24895B3AA43F80B07B561" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_8F707D9362A475A3C3A243F551F18769" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_ConsolidationPolicyTextBlock_8F707D9362A475A3C3A243F551F18769" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_58CA29F6A6C530F4C4B943EF141FF74D" xlink:type="locator"/>
<link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_58CA29F6A6C530F4C4B943EF141FF74D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementPolicyPolicyTextBlock" xlink:label="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_ED777A15789FE7F1751F43EF141F52B4" xlink:type="locator"/>
<link:presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_A82511F7D78566972FAF43EF141FAA84" xlink:to="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_ED777A15789FE7F1751F43EF141F52B4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesScheduleOfChangesToBalanceSheetForNewAccountingStandardsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_53B52442A748E54CB33BEFDDFABED3F0" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_30EAB078ED7B4D53F77CEFDDFABE95DD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_53B52442A748E54CB33BEFDDFABED3F0" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_30EAB078ED7B4D53F77CEFDDFABE95DD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2F88BE4B9F6592E12498EFDDFABE5CD7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_30EAB078ED7B4D53F77CEFDDFABE95DD" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2F88BE4B9F6592E12498EFDDFABE5CD7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_BD415E08A02ACF8075FEEFDDFABE9782" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2F88BE4B9F6592E12498EFDDFABE5CD7" xlink:to="loc_us-gaap_TypeOfAdoptionMember_BD415E08A02ACF8075FEEFDDFABE9782" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_BE2C53B8AC9EABAF0737EFDDFABE5FAC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfAdoptionMember_BD415E08A02ACF8075FEEFDDFABE9782" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_BE2C53B8AC9EABAF0737EFDDFABE5FAC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_123EA2EFA43C1B9F8C46EFDDFABE69C0" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_30EAB078ED7B4D53F77CEFDDFABE95DD" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_123EA2EFA43C1B9F8C46EFDDFABE69C0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_123EA2EFA43C1B9F8C46EFDDFABE69C0" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OperatingLeaseRightOfUseAssetsMember" xlink:label="loc_aon_OperatingLeaseRightOfUseAssetsMember_D7F102D552182E5BD221EFDDFABE331E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:to="loc_aon_OperatingLeaseRightOfUseAssetsMember_D7F102D552182E5BD221EFDDFABE331E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNoncurrentAssetsMember" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_03E04A08423815D8B2C1EFDDFABEC34F" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_03E04A08423815D8B2C1EFDDFABEC34F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_3BEBCD47EA061144BF67EFDDFABE6380" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_3BEBCD47EA061144BF67EFDDFABE6380" xlink:type="arc"/>
<link:loc xlink:href="aon-20191231.xsd#aon_OtherNoncurrentOperatingLeaseLiabilitiesMember" xlink:label="loc_aon_OtherNoncurrentOperatingLeaseLiabilitiesMember_69CFF160FDCFAD90DAC9EFDDFABE97E5" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:to="loc_aon_OtherNoncurrentOperatingLeaseLiabilitiesMember_69CFF160FDCFAD90DAC9EFDDFABE97E5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_4D56D7BC0FEC69078447EFDDFABE5E49" xlink:type="locator"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_965D50828487754C5409EFDDFABE8C24" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_4D56D7BC0FEC69078447EFDDFABE5E49" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_47C066CA1A3EA66C25BCEFDDFABE8E9D" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_30EAB078ED7B4D53F77CEFDDFABE95DD" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_47C066CA1A3EA66C25BCEFDDFABE8E9D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_3C3EFF473F3923E2CBBEEFDDFABE27CB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_47C066CA1A3EA66C25BCEFDDFABE8E9D" xlink:to="loc_us-gaap_AssetsAbstract_3C3EFF473F3923E2CBBEEFDDFABE27CB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_767C0EFF12F6D006126AEFDDFABE79F9" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_3C3EFF473F3923E2CBBEEFDDFABE27CB" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_767C0EFF12F6D006126AEFDDFABE79F9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_FE343B43822CF3B8DA18EFDDFABE79F1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_3C3EFF473F3923E2CBBEEFDDFABE27CB" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_FE343B43822CF3B8DA18EFDDFABE79F1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_DF3C1A662C7145F0454FEFDDFABEE7A1" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_47C066CA1A3EA66C25BCEFDDFABE8E9D" xlink:to="loc_us-gaap_LiabilitiesAbstract_DF3C1A662C7145F0454FEFDDFABEE7A1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_D57F553D9DE3521830FDEFDDFABE6FBB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_DF3C1A662C7145F0454FEFDDFABEE7A1" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_D57F553D9DE3521830FDEFDDFABE6FBB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_8BCB84BFEC03045F10B6EFDDFABEB2A6" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_DF3C1A662C7145F0454FEFDDFABEE7A1" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_8BCB84BFEC03045F10B6EFDDFABEB2A6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_CD45BE899581F1741603EFDDFABE9707" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_DF3C1A662C7145F0454FEFDDFABEE7A1" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_CD45BE899581F1741603EFDDFABE9707" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aon.com/role/SummaryOfSignificantAccountingPrinciplesAndPracticesTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_BAC64CCDF7E5203DF6F5FC7EF57D0523" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_C91031C5C8ECCBB8132EFC7EF57D73C7" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_BAC64CCDF7E5203DF6F5FC7EF57D0523" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_C91031C5C8ECCBB8132EFC7EF57D73C7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_885F95874CE7221BEED9FC8A75331C04" xlink:type="locator"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_BAC64CCDF7E5203DF6F5FC7EF57D0523" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_885F95874CE7221BEED9FC8A75331C04" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="loc_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_E9AF814A6FF3E6F8DB15FC7EF57DDC43" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_BAC64CCDF7E5203DF6F5FC7EF57D0523" xlink:to="loc_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_E9AF814A6FF3E6F8DB15FC7EF57DDC43" xlink:type="arc"/>
</link:presentationLink>
</link:linkbase>


14 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 2/16/24  Aon plc                           10-K       12/31/23  141:142M                                   Workiva Inc Wde… FA01/FA
 2/24/23  Aon plc                           424B5                  2:682K                                   Donnelley … Solutions/FA
 2/23/23  Aon plc                           424B5                  1:647K                                   Donnelley … Solutions/FA
 2/17/23  Aon plc                           10-K       12/31/22  135:18M                                    Workiva Inc Wde… FA01/FA
 9/08/22  Aon plc                           424B5                  2:698K                                   Donnelley … Solutions/FA
 9/07/22  Aon plc                           424B5                  1:657K                                   Donnelley … Solutions/FA
 2/25/22  Aon plc                           424B5                  2:689K                                   Donnelley … Solutions/FA
 2/23/22  Aon plc                           424B5                  1:650K                                   Donnelley … Solutions/FA
 2/18/22  Aon plc                           10-K       12/31/21  141:20M                                    Workiva Inc Wde… FA01/FA
12/01/21  Aon plc                           424B5                  1:663K                                   Donnelley … Solutions/FA
11/29/21  Aon plc                           424B5                  1:651K                                   Donnelley … Solutions/FA
 8/20/21  Aon plc                           424B5                  1:691K                                   Donnelley … Solutions/FA
 8/18/21  Aon plc                           424B5                  1:679K                                   Donnelley … Solutions/FA
 2/19/21  Aon plc                           10-K       12/31/20  138:19M                                    Workiva Inc Wde… FA01/FA
Top
Filing Submission 0001628280-20-001607   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
AboutPrivacyRedactionsHelp — Mon., Apr. 29, 4:50:15.2pm ET