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

Gartner Inc – ‘10-Q’ for 9/30/19 – ‘EX-101.PRE’

On:  Thursday, 10/31/19, at 6:31am ET   ·   For:  9/30/19   ·   Accession #:  749251-19-25   ·   File #:  1-14443

Previous ‘10-Q’:  ‘10-Q’ on 7/30/19 for 6/30/19   ·   Next:  ‘10-Q’ on 5/7/20 for 3/31/20   ·   Latest:  ‘10-Q’ on 4/30/24 for 3/31/24

Find Words in Filings emoji
 
  in    Show  and   Hints

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

10/31/19  Gartner Inc                       10-Q        9/30/19   80:11M

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

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.36M 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     31K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     31K 
 4: EX-32       Certification -- §906 - SOA'02                      HTML     27K 
22: R1          Cover Page                                          HTML     79K 
51: R2          Condensed Consolidated Balance Sheets               HTML    105K 
76: R3          Condensed Consolidated Balance Sheets               HTML     46K 
                (Parentheticals)                                                 
34: R4          Condensed Consolidated Statements of Operations     HTML     99K 
23: R5          Condensed Consolidated Statements of Comprehensive  HTML     49K 
                Income                                                           
52: R6          Condensed Consolidated Statements of Cash Flows     HTML    104K 
77: R7          Business and Basis of Presentation                  HTML    278K 
33: R8          Computation of Earnings Per Share                   HTML     60K 
26: R9          Stock-Based Compensation                            HTML    142K 
36: R10         Segment Information                                 HTML    133K 
10: R11         Goodwill and Intangible Assets                      HTML     98K 
57: R12         Debt                                                HTML     63K 
66: R13         Equity                                              HTML    245K 
37: R14         Income Taxes                                        HTML     34K 
11: R15         Derivatives and Hedging                             HTML     87K 
58: R16         Fair Value Disclosures                              HTML     61K 
67: R17         Employee Benefits                                   HTML     27K 
35: R18         Contingencies                                       HTML     28K 
12: R19         Subsequent Event                                    HTML     27K 
49: R20         Business and Basis of Presentation (Policies)       HTML    302K 
79: R21         Business and Basis of Presentation (Tables)         HTML    226K 
31: R22         Computation of Earnings Per Share (Tables)          HTML     60K 
24: R23         Stock-Based Compensation (Tables)                   HTML    161K 
50: R24         Segment Information (Tables)                        HTML    132K 
80: R25         Goodwill and Intangible Assets (Tables)             HTML    100K 
32: R26         Debt (Tables)                                       HTML     49K 
25: R27         Equity (Tables)                                     HTML    248K 
53: R28         Derivatives and Hedging (Tables)                    HTML     89K 
78: R29         Fair Value Disclosures (Tables)                     HTML     56K 
64: R30         Business and Basis of Presentation - Narrative      HTML     28K 
                (Details)                                                        
56: R31         Business and Basis of Presentation -                HTML     59K 
                Disaggregation of Revenue by Geographic Area                     
                (Details)                                                        
14: R32         Business and Basis of Presentation - Timing Of      HTML     51K 
                Revenue Recognition Liabilities per Segment                      
                (Details)                                                        
40: R33         Business and Basis of Presentation - Revenue        HTML     34K 
                Remaining Performance Obligation (Details)                       
63: R34         Business and Basis of Presentation - Schedule of    HTML     39K 
                Contract with Customer, Asset and Liability                      
                (Details)                                                        
55: R35         Business and Basis of Presentation - Additional     HTML     92K 
                Information (Details)                                            
13: R36         Business and Basis of Presentation - Net Lease      HTML     48K 
                Costs (Details)                                                  
39: R37         Business and Basis of Presentation - Lease          HTML     66K 
                Maturity (Details)                                               
65: R38         Business and Basis of Presentation - Supplemental   HTML     34K 
                Balance Sheet Information (Details)                              
54: R39         Business and Basis of Presentation - Leases Under   HTML     47K 
                Topic 840 (Details)                                              
74: R40         Computation of Earnings Per Share - Calculations    HTML     51K 
                Of Basic And Diluted (Loss) Earnings Per Share                   
                (Details)                                                        
48: R41         Computation of Earnings Per Share - Additional      HTML     26K 
                information (Details)                                            
18: R42         Stock-Based Compensation - Additional Information   HTML     48K 
                (Details)                                                        
28: R43         Stock-Based Compensation - Stock-based              HTML     45K 
                Compensation Expense by Award Type and Expense                   
                Category (Details)                                               
73: R44         Stock-Based Compensation - Summary Of Changes In    HTML     95K 
                SARs Outstanding (Details)                                       
47: R45         Stock-Based Compensation - Weighted Average         HTML     36K 
                Assumptions Used To Determine Fair Value Of SARs                 
                Grants On Date Of Grant Using Black-Scholes                      
                (Details)                                                        
17: R46         Stock-Based Compensation - Summary Of Changes In    HTML     74K 
                RSUs Outstanding (Details)                                       
27: R47         Stock-Based Compensation - Summary Of Changes In    HTML     48K 
                CSEs Outstanding (Details)                                       
75: R48         Segment Information - Information About Reportable  HTML     51K 
                Segments (Details)                                               
46: R49         Segment Information - Reconciliation of Segment     HTML     62K 
                Gross Contribution to Net Income (Details)                       
59: R50         Goodwill and Intangible Assets - Changes to         HTML     46K 
                Carrying Amount of Goodwill by Reporting Unit                    
                (Details)                                                        
70: R51         Goodwill and Intangible Assets - Carrying Amounts   HTML     74K 
                of Amortizable Intangible Assets (Details)                       
41: R52         Goodwill and Intangible Assets - Estimated Future   HTML     40K 
                Amortization Expense By Year From Amortizable                    
                Intangibles (Details)                                            
15: R53         Debt - Narrative (Details)                          HTML     65K 
60: R54         Debt - Borrowings (Details)                         HTML     41K 
71: R55         Debt - Footnote to Borrowings (Details)             HTML     69K 
42: R56         Debt - Interest Rate Swaps (Details)                HTML     41K 
16: R57         Equity - Share Repurchase Program and Share         HTML     35K 
                Repurchase Activity (Details)                                    
62: R58         Equity - Stockholders' Equity (Details)             HTML     79K 
69: R59         Equity - Changes in AOCI/L by Component (Details)   HTML     69K 
29: R60         Income Taxes (Details)                              HTML     38K 
19: R61         Derivatives and Hedging - Outstanding Derivatives   HTML     52K 
                Contracts (Details)                                              
43: R62         Derivatives and Hedging - Amounts Recognized in     HTML     31K 
                the Condensed Consolidated Statements of                         
                Operations for Derivative Contracts (Details)                    
72: R63         Fair Value Disclosures - Assets And Liabilities     HTML     51K 
                Measured At Fair Value On Recurring Basis                        
                (Details)                                                        
30: R64         Employee Benefits (Details)                         HTML     26K 
20: R65         Contingencies (Details)                             HTML     25K 
44: R66         Subsequent Events - (Details)                       HTML     31K 
45: XML         IDEA XML File -- Filing Summary                      XML    145K 
21: XML         XBRL Instance -- it-09302019x10q_htm                 XML   3.62M 
38: EXCEL       IDEA Workbook of Financial Reports                  XLSX    106K 
 6: EX-101.CAL  XBRL Calculations -- it-20190930_cal                 XML    222K 
 7: EX-101.DEF  XBRL Definitions -- it-20190930_def                  XML    698K 
 8: EX-101.LAB  XBRL Labels -- it-20190930_lab                       XML   1.67M 
 9: EX-101.PRE  XBRL Presentations -- it-20190930_pre                XML   1.04M 
 5: EX-101.SCH  XBRL Schema -- it-20190930                           XSD    165K 
68: JSON        XBRL Instance as JSON Data -- MetaLinks              355±   539K 
61: ZIP         XBRL Zipped Folder -- 0000749251-19-000025-xbrl      Zip    301K 


‘EX-101.PRE’   —   XBRL Presentations — it-20190930_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.gartner.com/role/BusinessAndBasisOfPresentation" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentation" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationAdditionalInformationDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationAdditionalInformationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationDisaggregationOfRevenueByGeographicAreaDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationDisaggregationOfRevenueByGeographicAreaDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationLeaseMaturityDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationLeaseMaturityDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationLeasesUnderTopic840Details" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationLeasesUnderTopic840Details" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationNarrativeDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationNetLeaseCostsDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationNetLeaseCostsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationPolicies" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationPolicies" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationRevenueRemainingPerformanceObligationDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationRevenueRemainingPerformanceObligationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationScheduleOfContractWithCustomerAssetAndLiabilityDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationScheduleOfContractWithCustomerAssetAndLiabilityDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationSupplementalBalanceSheetInformationDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationSupplementalBalanceSheetInformationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationTables" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/BusinessAndBasisOfPresentationTimingOfRevenueRecognitionLiabilitiesPerSegmentDetails" xlink:href="it-20190930.xsd#BusinessAndBasisOfPresentationTimingOfRevenueRecognitionLiabilitiesPerSegmentDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/ComputationOfEarningsPerShare" xlink:href="it-20190930.xsd#ComputationOfEarningsPerShare" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/ComputationOfEarningsPerShareAdditionalInformationDetails" xlink:href="it-20190930.xsd#ComputationOfEarningsPerShareAdditionalInformationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/ComputationOfEarningsPerShareCalculationsOfBasicAndDilutedLossEarningsPerShareDetails" xlink:href="it-20190930.xsd#ComputationOfEarningsPerShareCalculationsOfBasicAndDilutedLossEarningsPerShareDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/ComputationOfEarningsPerShareTables" xlink:href="it-20190930.xsd#ComputationOfEarningsPerShareTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/CondensedConsolidatedBalanceSheets" xlink:href="it-20190930.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/CondensedConsolidatedBalanceSheetsParentheticals" xlink:href="it-20190930.xsd#CondensedConsolidatedBalanceSheetsParentheticals" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="it-20190930.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:href="it-20190930.xsd#CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/CondensedConsolidatedStatementsOfOperations" xlink:href="it-20190930.xsd#CondensedConsolidatedStatementsOfOperations" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/Contingencies" xlink:href="it-20190930.xsd#Contingencies" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/ContingenciesDetails" xlink:href="it-20190930.xsd#ContingenciesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/CoverPage" xlink:href="it-20190930.xsd#CoverPage" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/Debt" xlink:href="it-20190930.xsd#Debt" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DebtBorrowingsDetails" xlink:href="it-20190930.xsd#DebtBorrowingsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DebtFootnoteToBorrowingsDetails" xlink:href="it-20190930.xsd#DebtFootnoteToBorrowingsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DebtInterestRateSwapsDetails" xlink:href="it-20190930.xsd#DebtInterestRateSwapsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DebtNarrativeDetails" xlink:href="it-20190930.xsd#DebtNarrativeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DebtTables" xlink:href="it-20190930.xsd#DebtTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DerivativesAndHedging" xlink:href="it-20190930.xsd#DerivativesAndHedging" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DerivativesAndHedgingAmountsRecognizedInCondensedConsolidatedStatementsOfOperationsForDerivativeContractsDetails" xlink:href="it-20190930.xsd#DerivativesAndHedgingAmountsRecognizedInCondensedConsolidatedStatementsOfOperationsForDerivativeContractsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DerivativesAndHedgingOutstandingDerivativesContractsDetails" xlink:href="it-20190930.xsd#DerivativesAndHedgingOutstandingDerivativesContractsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/DerivativesAndHedgingTables" xlink:href="it-20190930.xsd#DerivativesAndHedgingTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/EmployeeBenefits" xlink:href="it-20190930.xsd#EmployeeBenefits" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/EmployeeBenefitsDetails" xlink:href="it-20190930.xsd#EmployeeBenefitsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/Equity" xlink:href="it-20190930.xsd#Equity" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/EquityChangesInAociLByComponentDetails" xlink:href="it-20190930.xsd#EquityChangesInAociLByComponentDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/EquityShareRepurchaseProgramAndShareRepurchaseActivityDetails" xlink:href="it-20190930.xsd#EquityShareRepurchaseProgramAndShareRepurchaseActivityDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/EquityStockholdersEquityDetails" xlink:href="it-20190930.xsd#EquityStockholdersEquityDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/EquityTables" xlink:href="it-20190930.xsd#EquityTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/FairValueDisclosures" xlink:href="it-20190930.xsd#FairValueDisclosures" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/FairValueDisclosuresAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="it-20190930.xsd#FairValueDisclosuresAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/FairValueDisclosuresTables" xlink:href="it-20190930.xsd#FairValueDisclosuresTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/GoodwillAndIntangibleAssets" xlink:href="it-20190930.xsd#GoodwillAndIntangibleAssets" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/GoodwillAndIntangibleAssetsCarryingAmountsOfAmortizableIntangibleAssetsDetails" xlink:href="it-20190930.xsd#GoodwillAndIntangibleAssetsCarryingAmountsOfAmortizableIntangibleAssetsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/GoodwillAndIntangibleAssetsChangesToCarryingAmountOfGoodwillByReportingUnitDetails" xlink:href="it-20190930.xsd#GoodwillAndIntangibleAssetsChangesToCarryingAmountOfGoodwillByReportingUnitDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/GoodwillAndIntangibleAssetsEstimatedFutureAmortizationExpenseByYearFromAmortizableIntangiblesDetails" xlink:href="it-20190930.xsd#GoodwillAndIntangibleAssetsEstimatedFutureAmortizationExpenseByYearFromAmortizableIntangiblesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/GoodwillAndIntangibleAssetsTables" xlink:href="it-20190930.xsd#GoodwillAndIntangibleAssetsTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/IncomeTaxes" xlink:href="it-20190930.xsd#IncomeTaxes" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/IncomeTaxesDetails" xlink:href="it-20190930.xsd#IncomeTaxesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/SegmentInformation" xlink:href="it-20190930.xsd#SegmentInformation" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/SegmentInformationInformationAboutReportableSegmentsDetails" xlink:href="it-20190930.xsd#SegmentInformationInformationAboutReportableSegmentsDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/SegmentInformationReconciliationOfSegmentGrossContributionToNetIncomeDetails" xlink:href="it-20190930.xsd#SegmentInformationReconciliationOfSegmentGrossContributionToNetIncomeDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/SegmentInformationTables" xlink:href="it-20190930.xsd#SegmentInformationTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensation" xlink:href="it-20190930.xsd#StockBasedCompensation" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:href="it-20190930.xsd#StockBasedCompensationAdditionalInformationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationStockBasedCompensationExpenseByAwardTypeAndExpenseCategoryDetails" xlink:href="it-20190930.xsd#StockBasedCompensationStockBasedCompensationExpenseByAwardTypeAndExpenseCategoryDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationSummaryOfChangesInCsesOutstandingDetails" xlink:href="it-20190930.xsd#StockBasedCompensationSummaryOfChangesInCsesOutstandingDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationSummaryOfChangesInRsusOutstandingDetails" xlink:href="it-20190930.xsd#StockBasedCompensationSummaryOfChangesInRsusOutstandingDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationSummaryOfChangesInSarsOutstandingDetails" xlink:href="it-20190930.xsd#StockBasedCompensationSummaryOfChangesInSarsOutstandingDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationTables" xlink:href="it-20190930.xsd#StockBasedCompensationTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/StockBasedCompensationWeightedAverageAssumptionsUsedToDetermineFairValueOfSarsGrantsOnDateOfGrantUsingBlackScholesDetails" xlink:href="it-20190930.xsd#StockBasedCompensationWeightedAverageAssumptionsUsedToDetermineFairValueOfSarsGrantsOnDateOfGrantUsingBlackScholesDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/SubsequentEvent" xlink:href="it-20190930.xsd#SubsequentEvent" xlink:type="simple"/>
<link:roleRef roleURI="http://www.gartner.com/role/SubsequentEventsDetails" xlink:href="it-20190930.xsd#SubsequentEventsDetails" 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.gartner.com/role/BusinessAndBasisOfPresentation" 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_43D3C68A22FA571F8D68614B821B2649" 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_9B8F8A9A89B45C8D83BED97FF08909DC" xlink:type="locator"/>
<link:presentationArc order="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_43D3C68A22FA571F8D68614B821B2649" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_9B8F8A9A89B45C8D83BED97FF08909DC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationAdditionalInformationDetails" 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_4A3A6EC55BA76B2DFBE41D6B644625F6" 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_EE1C7C390F1D60019CE21D6B64461608" xlink:type="locator"/>
<link:presentationArc order="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_4A3A6EC55BA76B2DFBE41D6B644625F6" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_EE1C7C390F1D60019CE21D6B64461608" 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_A72243AE1F2F1B0DF9901D6B6447D4E1" xlink:type="locator"/>
<link:presentationArc order="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_EE1C7C390F1D60019CE21D6B64461608" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_A72243AE1F2F1B0DF9901D6B6447D4E1" 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_D76101905C65EF4CA0AC1D6B64471A6F" xlink:type="locator"/>
<link:presentationArc order="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_A72243AE1F2F1B0DF9901D6B6447D4E1" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_D76101905C65EF4CA0AC1D6B64471A6F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_D529CE518DD013ADEC851D6B64473782" xlink:type="locator"/>
<link:presentationArc order="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_D76101905C65EF4CA0AC1D6B64471A6F" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_D529CE518DD013ADEC851D6B64473782" 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_E4B2BED6D125A484B3121D6B6448CFDD" 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_EE1C7C390F1D60019CE21D6B64461608" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_E4B2BED6D125A484B3121D6B6448CFDD" 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_BE3CFD2988E1F604EBF91D6B64481281" xlink:type="locator"/>
<link:presentationArc order="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_E4B2BED6D125A484B3121D6B6448CFDD" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_BE3CFD2988E1F604EBF91D6B64481281" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseMember" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseMember_F0E3F6061A65DF139C021D6B6448E438" xlink:type="locator"/>
<link:presentationArc order="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_BE3CFD2988E1F604EBF91D6B64481281" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseMember_F0E3F6061A65DF139C021D6B6448E438" 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_4FA438AB97240E259BB41D6B6448E075" 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_EE1C7C390F1D60019CE21D6B64461608" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_4FA438AB97240E259BB41D6B6448E075" 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_DF7FD4CDAEDF5D71916F1D6B64480AC2" xlink:type="locator"/>
<link:presentationArc order="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_4FA438AB97240E259BB41D6B6448E075" xlink:to="loc_us-gaap_TypeOfAdoptionMember_DF7FD4CDAEDF5D71916F1D6B64480AC2" 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_B267B136C0EB79E545791D6B6449E8B2" xlink:type="locator"/>
<link:presentationArc order="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_DF7FD4CDAEDF5D71916F1D6B64480AC2" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_B267B136C0EB79E545791D6B6449E8B2" 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_C7C15391512DCDA3FD961D6B644AA88D" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_EE1C7C390F1D60019CE21D6B64461608" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" 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_D21473C8DA89506ECFF71D6B644A4DF6" xlink:type="locator"/>
<link:presentationArc order="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_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_D21473C8DA89506ECFF71D6B644A4DF6" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BusinessCombinationAcquisitionandIntegrationRelatedCosts" xlink:label="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_6622EE539F27146E64611D6B644A7F2F" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_6622EE539F27146E64611D6B644A7F2F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessExitCosts1" xlink:label="loc_us-gaap_BusinessExitCosts1_EB4BA83EC4140890D9841D6B644A0FB3" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_BusinessExitCosts1_EB4BA83EC4140890D9841D6B644A0FB3" 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_5E9C656DFC40251146FE1D6B644B407A" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_5E9C656DFC40251146FE1D6B644B407A" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_NumberOfBusinessesSold" xlink:label="loc_it_NumberOfBusinessesSold_CAF774B175727FC57E7C1D6B644B6E9B" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_it_NumberOfBusinessesSold_CAF774B175727FC57E7C1D6B644B6E9B" 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_CDA9F92D41A0745BFA6C1D6B644B112B" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_CDA9F92D41A0745BFA6C1D6B644B112B" 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_9B95DB54F4ADAFD00F721D6B644B5A9D" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_9B95DB54F4ADAFD00F721D6B644B5A9D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A8E27ED2F7CE5D8721721D6B644B8113" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A8E27ED2F7CE5D8721721D6B644B8113" 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_9219A315084B52A92D851D6B644B4456" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_9219A315084B52A92D851D6B644B4456" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGain" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNi" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E0931425F9502FE053451D6B644CC919" xlink:type="locator"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E0931425F9502FE053451D6B644CC919" 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_D6CF2970D7E32E37442D1D6B644CB880" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_D6CF2970D7E32E37442D1D6B644CB880" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCash" xlink:label="loc_us-gaap_RestrictedCash_6935890ACE93CDB453491D6B644CB9C2" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_RestrictedCash_6935890ACE93CDB453491D6B644CB9C2" 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_70F317B476965E67AB701D6B644C78F0" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_70F317B476965E67AB701D6B644C78F0" 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_245CC6D8523AF5B06DFC1D6B644D9D90" xlink:type="locator"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2009/role/netLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_OperatingLeaseLiability_245CC6D8523AF5B06DFC1D6B644D9D90" 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_4AA669F39A683979BB111D6B644D4070" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_Assets_4AA669F39A683979BB111D6B644D4070" 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_B790D76AA90C4B823B7E1D6B644DAB37" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_Liabilities_B790D76AA90C4B823B7E1D6B644DAB37" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3" 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_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_LesseeOperatingLeaseOptiontoTerminateTerm" xlink:label="loc_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C" 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_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C7C15391512DCDA3FD961D6B644AA88D" xlink:to="loc_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationDisaggregationOfRevenueByGeographicAreaDetails" 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_9CBCB9E73BE0573584B83A0A18819524" 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_2AC75BD62F075520AB518061BACE41A9" xlink:type="locator"/>
<link:presentationArc order="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_9CBCB9E73BE0573584B83A0A18819524" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_2AC75BD62F075520AB518061BACE41A9" 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_0EDB15C11B0853DFA2342C84AAB5F0BF" xlink:type="locator"/>
<link:presentationArc order="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_2AC75BD62F075520AB518061BACE41A9" xlink:to="loc_srt_StatementGeographicalAxis_0EDB15C11B0853DFA2342C84AAB5F0BF" 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_272E7932AD425DA6AFA801A4C651A783" xlink:type="locator"/>
<link: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_0EDB15C11B0853DFA2342C84AAB5F0BF" xlink:to="loc_srt_SegmentGeographicalDomain_272E7932AD425DA6AFA801A4C651A783" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_UnitedStatesAndCanadaMember" xlink:label="loc_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:type="locator"/>
<link: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_272E7932AD425DA6AFA801A4C651A783" xlink:to="loc_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EuropeMiddleEastAfricaMember" xlink:label="loc_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" 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_272E7932AD425DA6AFA801A4C651A783" xlink:to="loc_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherInternationalMember" xlink:label="loc_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" 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_272E7932AD425DA6AFA801A4C651A783" xlink:to="loc_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" 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_2AC75BD62F075520AB518061BACE41A9" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:to="loc_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ResearchSegmentMember" xlink:label="loc_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:to="loc_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EventsMember" xlink:label="loc_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" 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_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:to="loc_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ConsultingMember" xlink:label="loc_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" 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_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:to="loc_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherRevenueMember" xlink:label="loc_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" 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_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:to="loc_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" 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_ADADEF225C765A53B9FDADC8077F4352" 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_2AC75BD62F075520AB518061BACE41A9" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_ADADEF225C765A53B9FDADC8077F4352" 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_0ECE53030AE45094B4AB21D7DB29D663" xlink:type="locator"/>
<link:presentationArc order="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_ADADEF225C765A53B9FDADC8077F4352" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0ECE53030AE45094B4AB21D7DB29D663" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationLeaseMaturityDetails" 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_BC7272D667D9D0974EB31D6B604A021F" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_75B2799F4E71E94D33BA1D78E9B8C254" xlink:type="locator"/>
<link:presentationArc order="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_BC7272D667D9D0974EB31D6B604A021F" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_75B2799F4E71E94D33BA1D78E9B8C254" 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_4B30EC8B32AB274081201D791B3D8F79" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_75B2799F4E71E94D33BA1D78E9B8C254" xlink:to="loc_srt_StatementGeographicalAxis_4B30EC8B32AB274081201D791B3D8F79" 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_C574CCA982C6D2ED63101D791B3EA1C1" xlink:type="locator"/>
<link: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_4B30EC8B32AB274081201D791B3D8F79" xlink:to="loc_srt_SegmentGeographicalDomain_C574CCA982C6D2ED63101D791B3EA1C1" 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_3F45BF8AE956B6F1CDD31D791B3E9B82" xlink:type="locator"/>
<link: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_C574CCA982C6D2ED63101D791B3EA1C1" xlink:to="loc_country_US_3F45BF8AE956B6F1CDD31D791B3E9B82" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92" 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_LesseeLeaseDescriptionTable_75B2799F4E71E94D33BA1D78E9B8C254" xlink:to="loc_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OperatingLeasesConcentrationPercentageOfPayments" xlink:label="loc_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92" xlink:to="loc_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC" xlink:type="arc"/>
<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_D5921DB6B6646B15F2791D6B604AFFDF" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BC7272D667D9D0974EB31D6B604A021F" xlink:to="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_D5921DB6B6646B15F2791D6B604AFFDF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" xlink:type="locator"/>
<link:presentationArc order="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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" 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_60E7AE6778E19D8A1C5D1D6B604BBEC9" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9" 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_E16829B1D774BD006F161D6B604B48C8" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_E16829B1D774BD006F161D6B604B48C8" 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_6F830480292B6D434DE71D6B6050BCA3" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6F830480292B6D434DE71D6B6050BCA3" 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_D61FF56DC7CC7B1658731D6B60503329" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_D61FF56DC7CC7B1658731D6B60503329" 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_4C76B32B82C7543FA6E31D6B60511EF1" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4C76B32B82C7543FA6E31D6B60511EF1" 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_9891AB7DC082C43DBCB01D6B6051C7EB" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9891AB7DC082C43DBCB01D6B6051C7EB" 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_A80866B712DA943FF18B1D6B6051E387" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_A80866B712DA943FF18B1D6B6051E387" 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_E60768D0FDC9B8D1EB461D6B6051E54E" 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_D5921DB6B6646B15F2791D6B604AFFDF" xlink:to="loc_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BC7272D667D9D0974EB31D6B604A021F" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" 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_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" 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_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" 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_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" 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_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" 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_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" 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_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationLeasesUnderTopic840Details" 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_72171949526E56F88232B4C0751F65CE" xlink:type="locator"/>
<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_8DF50620A04950B7987146611F433C05" xlink:type="locator"/>
<link:presentationArc order="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_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8DF50620A04950B7987146611F433C05" 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_5F90A182BC215D0F827B4C1D299B0E16" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_5F90A182BC215D0F827B4C1D299B0E16" 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_501D6A17ED66541F97AEA6167B1386A2" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_501D6A17ED66541F97AEA6167B1386A2" 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_46CF8732D79159E98F4BC70EF1425792" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_46CF8732D79159E98F4BC70EF1425792" 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_F8B598B2EE7158C1B017B533FD996955" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F8B598B2EE7158C1B017B533FD996955" 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_745ECA0632265A93A083953F8C5A1C4E" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_745ECA0632265A93A083953F8C5A1C4E" 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_1547A44E1754541CBC0D582DF378EBDE" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_1547A44E1754541CBC0D582DF378EBDE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue" xlink:label="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_7D66BFE6951E5D8CBD95CA4B5A87A5F9" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_72171949526E56F88232B4C0751F65CE" xlink:to="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_7D66BFE6951E5D8CBD95CA4B5A87A5F9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationNarrativeDetails" 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_7AAC614AAC12473EE8B720DE86620318" xlink:type="locator"/>
<link:loc xlink:href="it-20190930.xsd#it_NumberofEnterprisesServed" xlink:label="loc_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7AAC614AAC12473EE8B720DE86620318" xlink:to="loc_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfCountriesInWhichEntityOperates" xlink:label="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7AAC614AAC12473EE8B720DE86620318" xlink:to="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00" xlink:type="arc"/>
<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_B47253B3BEBBB5266C0520DE8663FE39" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_7AAC614AAC12473EE8B720DE86620318" xlink:to="loc_us-gaap_NumberOfReportableSegments_B47253B3BEBBB5266C0520DE8663FE39" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationNetLeaseCostsDetails" 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_D9769132CC7958118A90A964210B7A40" 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_3BC2421F0DC8540883E00D69689941C7" xlink:type="locator"/>
<link:presentationArc order="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_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_OperatingLeaseCost_3BC2421F0DC8540883E00D69689941C7" 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_68F095205B485B75949456A564343647" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_VariableLeaseCost_68F095205B485B75949456A564343647" 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_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_SubleaseIncome_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" 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_C696187ADB795BA79D843C00A89068BD" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_LeaseCost_C696187ADB795BA79D843C00A89068BD" 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_8D09A72314EC5B6E85B1593A86778DBA" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_OperatingLeasePayments_8D09A72314EC5B6E85B1593A86778DBA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromLeasePayments" xlink:label="loc_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" 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_CC418AC6E5985948BAF299DBF1A26245" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_CC418AC6E5985948BAF299DBF1A26245" 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_E517E71827915D51A9D6E0B282097436" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_E517E71827915D51A9D6E0B282097436" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OperatingLeaseCostSubleasingActivities" xlink:label="loc_it_OperatingLeaseCostSubleasingActivities_B35F4ECCD74D58748515EE88D6F01738" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D9769132CC7958118A90A964210B7A40" xlink:to="loc_it_OperatingLeaseCostSubleasingActivities_B35F4ECCD74D58748515EE88D6F01738" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationPolicies" 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_F88AFE54BABA50EF987AD768C820BA5B" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_A7348B051ACF54929C5614BF913B87AC" xlink:type="locator"/>
<link:presentationArc order="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_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_A7348B051ACF54929C5614BF913B87AC" xlink:type="arc"/>
<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_04C9EDD278605091B35553813E6EA885" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_04C9EDD278605091B35553813E6EA885" 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_B52A675E0A0058ADAB9A7B65792B99BA" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_ConsolidationPolicyTextBlock_B52A675E0A0058ADAB9A7B65792B99BA" 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_5611491574435B168A28F7BB5AA36456" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_UseOfEstimates_5611491574435B168A28F7BB5AA36456" 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_6999BC145FB2512D856B9DAE58539994" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_6999BC145FB2512D856B9DAE58539994" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationsPolicy" xlink:label="loc_us-gaap_BusinessCombinationsPolicy_2C39F93178BF5842B2C751E0F258F654" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_BusinessCombinationsPolicy_2C39F93178BF5842B2C751E0F258F654" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock" xlink:label="loc_us-gaap_CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock_0B7A4C7584B9563A95FBFA7E81BF8CA6" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock_0B7A4C7584B9563A95FBFA7E81BF8CA6" 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_D52A40D99D985DAA91C6EEFA83741FE8" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_F88AFE54BABA50EF987AD768C820BA5B" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_D52A40D99D985DAA91C6EEFA83741FE8" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationRevenueRemainingPerformanceObligationDetails" 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_5916504B77D75E62B8832920B4CDCE6A" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0D0F5B64D5D759E1820ADE3BCEF382CE" xlink:type="locator"/>
<link:presentationArc order="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_5916504B77D75E62B8832920B4CDCE6A" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0D0F5B64D5D759E1820ADE3BCEF382CE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_315D3E40D1E8585F8CC8484CA57B7B04" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0D0F5B64D5D759E1820ADE3BCEF382CE" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_315D3E40D1E8585F8CC8484CA57B7B04" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_E16E0C80234350338D96D30A32027AEF" 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_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0D0F5B64D5D759E1820ADE3BCEF382CE" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_E16E0C80234350338D96D30A32027AEF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_C957CDEF13C25785933B61B3583B8645" 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_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_E16E0C80234350338D96D30A32027AEF" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_C957CDEF13C25785933B61B3583B8645" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationScheduleOfContractWithCustomerAssetAndLiabilityDetails" 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_FB5C1DFED4D6B938920320DE864D93C7" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetAbstract" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:type="locator"/>
<link:presentationArc order="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_FB5C1DFED4D6B938920320DE864D93C7" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetGross" xlink:label="loc_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" 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_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:to="loc_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityAbstract" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_FB5C1DFED4D6B938920320DE864D93C7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:type="arc"/>
<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_785A073575B9ABBEF6C820DE864E4903" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_785A073575B9ABBEF6C820DE864E4903" 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_E8AC14442593ADDB4D0320DE864E15DC" 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_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" 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_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:to="loc_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationSupplementalBalanceSheetInformationDetails" 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_D6B36B1E6A895994B6817CCA20CC1715" xlink:type="locator"/>
<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_383409B2CF565FCCB32A527CB919C740" xlink:type="locator"/>
<link:presentationArc order="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_D6B36B1E6A895994B6817CCA20CC1715" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_383409B2CF565FCCB32A527CB919C740" 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_B1A45FC471AA530D8C4C4751C80400AB" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D6B36B1E6A895994B6817CCA20CC1715" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_B1A45FC471AA530D8C4C4751C80400AB" 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_AA07E37E4AA1515585CAF743E1072CFE" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D6B36B1E6A895994B6817CCA20CC1715" xlink:to="loc_us-gaap_OperatingLeaseLiability_AA07E37E4AA1515585CAF743E1072CFE" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue" xlink:label="loc_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_FAAE8BF874FD5A2983814A97E0BD98E1" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D6B36B1E6A895994B6817CCA20CC1715" xlink:to="loc_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_FAAE8BF874FD5A2983814A97E0BD98E1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_49D61C9B8FA254CD90D0EF02BE1379CA" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_D6B36B1E6A895994B6817CCA20CC1715" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_49D61C9B8FA254CD90D0EF02BE1379CA" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationTables" 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_BBA4951488805FDD89CC03CF37A7207C" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock" xlink:label="loc_us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_A9C593E61F3150ECB6390F857783D5BF" xlink:type="locator"/>
<link:presentationArc order="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_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_A9C593E61F3150ECB6390F857783D5BF" xlink:type="arc"/>
<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_3A19DED9F0C75B95A839EFA315D650B8" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_3A19DED9F0C75B95A839EFA315D650B8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock" xlink:label="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_CF5FCE5E687057DE8B23395D84D9EAA8" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_CF5FCE5E687057DE8B23395D84D9EAA8" 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_9E17C68E708F5E679248792534592E75" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_us-gaap_LeaseCostTableTextBlock_9E17C68E708F5E679248792534592E75" 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_1A441937A4B45BC990BB5A528E8A6628" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_1A441937A4B45BC990BB5A528E8A6628" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_AssetsAndLiabilitiesLeasesTableTextBlock" xlink:label="loc_it_AssetsAndLiabilitiesLeasesTableTextBlock_D51D9704AEC35716A6812956E7D504FD" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_it_AssetsAndLiabilitiesLeasesTableTextBlock_D51D9704AEC35716A6812956E7D504FD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_2443B28C2D755B588B439CC7C2A4DD5F" 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_BBA4951488805FDD89CC03CF37A7207C" xlink:to="loc_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_2443B28C2D755B588B439CC7C2A4DD5F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/BusinessAndBasisOfPresentationTimingOfRevenueRecognitionLiabilitiesPerSegmentDetails" 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_4466CF8ED33A5A6D8203B2612995A74D" 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_E4A2402EAA415A609A17DB6C5559D54F" xlink:type="locator"/>
<link:presentationArc order="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_4466CF8ED33A5A6D8203B2612995A74D" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_E4A2402EAA415A609A17DB6C5559D54F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2A6BAEEDCA1957F79D1828D89674994D" xlink:type="locator"/>
<link:presentationArc order="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_E4A2402EAA415A609A17DB6C5559D54F" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2A6BAEEDCA1957F79D1828D89674994D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_1122531DE55351379124D2CF781DEC10" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2A6BAEEDCA1957F79D1828D89674994D" xlink:to="loc_us-gaap_SegmentDomain_1122531DE55351379124D2CF781DEC10" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ResearchSegmentMember" xlink:label="loc_it_ResearchSegmentMember_8E8BBB7D0CC6527196990BDEB0B74299" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_1122531DE55351379124D2CF781DEC10" xlink:to="loc_it_ResearchSegmentMember_8E8BBB7D0CC6527196990BDEB0B74299" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EventsMember" xlink:label="loc_it_EventsMember_AFE648776F0A560EBD0A23B301668642" 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_SegmentDomain_1122531DE55351379124D2CF781DEC10" xlink:to="loc_it_EventsMember_AFE648776F0A560EBD0A23B301668642" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ConsultingMember" xlink:label="loc_it_ConsultingMember_F5921A2A8D1655168265FED6E08C6796" 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_SegmentDomain_1122531DE55351379124D2CF781DEC10" xlink:to="loc_it_ConsultingMember_F5921A2A8D1655168265FED6E08C6796" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherRevenueMember" xlink:label="loc_it_OtherRevenueMember_18EF7E38C65054AD92F69F83E6200111" 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_SegmentDomain_1122531DE55351379124D2CF781DEC10" xlink:to="loc_it_OtherRevenueMember_18EF7E38C65054AD92F69F83E6200111" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_4430AA699E90566B960C29A8E4CCA49C" 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_E4A2402EAA415A609A17DB6C5559D54F" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_4430AA699E90566B960C29A8E4CCA49C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_426FBF215AC85D67991585D3F444097A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_4430AA699E90566B960C29A8E4CCA49C" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_426FBF215AC85D67991585D3F444097A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransferredOverTimeMember" xlink:label="loc_us-gaap_TransferredOverTimeMember_0D1E04F07EAD5ADAAB08AEB18DFE0DE1" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_426FBF215AC85D67991585D3F444097A" xlink:to="loc_us-gaap_TransferredOverTimeMember_0D1E04F07EAD5ADAAB08AEB18DFE0DE1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransferredAtPointInTimeMember" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_F96299E6E0E2578481EA3AD2CC639565" 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_TimingOfTransferOfGoodOrServiceDomain_426FBF215AC85D67991585D3F444097A" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_F96299E6E0E2578481EA3AD2CC639565" 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_638E0CC1698A516792AA001E403AB6D6" 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_E4A2402EAA415A609A17DB6C5559D54F" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_638E0CC1698A516792AA001E403AB6D6" 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_61A461B65B535519B968FB68DE0A442B" xlink:type="locator"/>
<link:presentationArc order="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_638E0CC1698A516792AA001E403AB6D6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_61A461B65B535519B968FB68DE0A442B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/ComputationOfEarningsPerShare" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_DF964B8E97ED5DA7BFF6BA93329E0ED0" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_4865AA39D95D555AB6B85071C102BA52" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_DF964B8E97ED5DA7BFF6BA93329E0ED0" xlink:to="loc_us-gaap_EarningsPerShareTextBlock_4865AA39D95D555AB6B85071C102BA52" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/ComputationOfEarningsPerShareAdditionalInformationDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_774864D956945D45BF4A3D7AB5B49DB3" xlink:type="locator"/>
<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_0FE081B6BB6F5A8A9F3D49070FB091CE" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_774864D956945D45BF4A3D7AB5B49DB3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0FE081B6BB6F5A8A9F3D49070FB091CE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/ComputationOfEarningsPerShareCalculationsOfBasicAndDilutedLossEarningsPerShareDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_7EE436E796765D4A9C62A40E32DEA673" xlink:type="locator"/>
<link:loc xlink:href="it-20190930.xsd#it_NumeratorAbstract" xlink:label="loc_it_NumeratorAbstract_37ED8F9AAF1A5330B83EB6595CED49B3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_7EE436E796765D4A9C62A40E32DEA673" xlink:to="loc_it_NumeratorAbstract_37ED8F9AAF1A5330B83EB6595CED49B3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_DC758A5E8F415C9E9D7A90E054D51E2D" 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_it_NumeratorAbstract_37ED8F9AAF1A5330B83EB6595CED49B3" xlink:to="loc_us-gaap_NetIncomeLoss_DC758A5E8F415C9E9D7A90E054D51E2D" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DenominatorAbstract" xlink:label="loc_it_DenominatorAbstract_9322E2714D6D5FFF92BD14A6391EBFDF" 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_EarningsPerShareAbstract_7EE436E796765D4A9C62A40E32DEA673" xlink:to="loc_it_DenominatorAbstract_9322E2714D6D5FFF92BD14A6391EBFDF" 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_CA2FB27053D951BB80A2E25DADA01509" 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_it_DenominatorAbstract_9322E2714D6D5FFF92BD14A6391EBFDF" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_CA2FB27053D951BB80A2E25DADA01509" 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_FA7CAC953E3954A4BBC62BEC349D6176" 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_it_DenominatorAbstract_9322E2714D6D5FFF92BD14A6391EBFDF" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_FA7CAC953E3954A4BBC62BEC349D6176" 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_9F448E37EC8B533EB4AFDFFE36F5AFE8" 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_it_DenominatorAbstract_9322E2714D6D5FFF92BD14A6391EBFDF" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_9F448E37EC8B533EB4AFDFFE36F5AFE8" 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_CC1C9C2352C159E9B78323B142120155" 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_EarningsPerShareAbstract_7EE436E796765D4A9C62A40E32DEA673" xlink:to="loc_us-gaap_EarningsPerShareBasic_CC1C9C2352C159E9B78323B142120155" 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_7F121A29D2225DA5AF3116C979A05C5A" 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_EarningsPerShareAbstract_7EE436E796765D4A9C62A40E32DEA673" xlink:to="loc_us-gaap_EarningsPerShareDiluted_7F121A29D2225DA5AF3116C979A05C5A" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/ComputationOfEarningsPerShareTables" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_F7220061ED2759C7B4673AD5DBD2C1C8" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_8CD4528A5CA35748AE71347FCA1BFC05" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_F7220061ED2759C7B4673AD5DBD2C1C8" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_8CD4528A5CA35748AE71347FCA1BFC05" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/CondensedConsolidatedBalanceSheets" 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_F0B5B0C426D4B6A2AAB8FE36860D852B" 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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:type="locator"/>
<link:presentationArc order="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_F0B5B0C426D4B6A2AAB8FE36860D852B" xlink:to="loc_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" 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_2951166702C654E9625FFE36860D8D06" xlink:type="locator"/>
<link:presentationArc order="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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" 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_E63361D133DB7EC60E7EFE36860EB6A8" xlink:type="locator"/>
<link:presentationArc order="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_2951166702C654E9625FFE36860D8D06" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8" 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_EE9714177FAD5A43AAB4FE36860E490D" 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_2951166702C654E9625FFE36860D8D06" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_EE9714177FAD5A43AAB4FE36860E490D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherDeferredCostsNet" xlink:label="loc_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562" 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_2951166702C654E9625FFE36860D8D06" xlink:to="loc_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6" 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_2951166702C654E9625FFE36860D8D06" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6" 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_1F24619561A7C81318B3FE36860F99A8" 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_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" xlink:to="loc_us-gaap_AssetsCurrent_1F24619561A7C81318B3FE36860F99A8" 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_C3E151536898AF4EF93CFE36860F038C" 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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_C3E151536898AF4EF93CFE36860F038C" 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_5D85608EC9A848D715A4FE36860F2C95" 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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_5D85608EC9A848D715A4FE36860F2C95" 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_4707E31F86A9DE8E2B20FE36860FDC5D" 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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_Goodwill_4707E31F86A9DE8E2B20FE36860FDC5D" 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_41690DE408D885D51E9CFE3686101C69" 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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_41690DE408D885D51E9CFE3686101C69" 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_A88F44BA4D1279AD34E7FE36861010FF" 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_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_A88F44BA4D1279AD34E7FE36861010FF" 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_DBBFFC4A1404793244F8FE36861076BC" 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_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="loc_us-gaap_Assets_DBBFFC4A1404793244F8FE36861076BC" 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_030E50047FC22E94116FFE3686106A0D" 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_F0B5B0C426D4B6A2AAB8FE36860D852B" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" 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_02351D4973A6BE0CCC5DFE3686119EA6" xlink:type="locator"/>
<link:presentationArc order="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_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6" 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_348863C7DB0A4B218EBFFE36861155F8" xlink:type="locator"/>
<link:presentationArc order="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_02351D4973A6BE0CCC5DFE3686119EA6" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_348863C7DB0A4B218EBFFE36861155F8" xlink:type="arc"/>
<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_91CA0B089147E0C2F3CAFE368611D3C3" 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_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_91CA0B089147E0C2F3CAFE368611D3C3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A" 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_02351D4973A6BE0CCC5DFE3686119EA6" xlink:to="loc_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A" 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_B12EE9715B7422233218FE3686126882" 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_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6" xlink:to="loc_us-gaap_LiabilitiesCurrent_B12EE9715B7422233218FE3686126882" 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_78A31595A5315761AF09FE3686129336" 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_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_78A31595A5315761AF09FE3686129336" 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_3AA69E87EE8ADC02E7EBFE368612C646" 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_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3AA69E87EE8ADC02E7EBFE368612C646" 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_9E1AC49EBD8FC8A6EAF0FE36861216A0" 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_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_9E1AC49EBD8FC8A6EAF0FE36861216A0" 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_C5CF857FD9D50D0F2FE4FE368613C829" 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_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_Liabilities_C5CF857FD9D50D0F2FE4FE368613C829" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" 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_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_9EB76A4D2DADA09D6194FE3686138BCD" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_PreferredStockValue_9EB76A4D2DADA09D6194FE3686138BCD" 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_8D8F3DAEC6A6072E7B30FE368613286B" 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_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_CommonStockValue_8D8F3DAEC6A6072E7B30FE368613286B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_8FFEF906E1E6280A816DFE3686136075" 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_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_AdditionalPaidInCapital_8FFEF906E1E6280A816DFE3686136075" 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_84EA74EDABAF723841AFFE368614A403" 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_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_84EA74EDABAF723841AFFE368614A403" 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_217E1BF5B7DF216E1C2DFE3686147F24" 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_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_217E1BF5B7DF216E1C2DFE3686147F24" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_10B3471989CF561E31E0FE3686148AB0" 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_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_TreasuryStockValue_10B3471989CF561E31E0FE3686148AB0" 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_B6E19E0839AE89DB02BDFE368614E5B7" 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_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:to="loc_us-gaap_StockholdersEquity_B6E19E0839AE89DB02BDFE368614E5B7" 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_4FA76EA4A577DB770C7CFE3686151CAE" 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_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_4FA76EA4A577DB770C7CFE3686151CAE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/CondensedConsolidatedBalanceSheetsParentheticals" 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_689A42E74BD967B4F81704186C028392" xlink:type="locator"/>
<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_300D647129B91C37000C04186C02D872" xlink:type="locator"/>
<link:presentationArc order="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_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_300D647129B91C37000C04186C02D872" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_71E93ACBFBE72848BE8B04186C03AF4D" 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_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_71E93ACBFBE72848BE8B04186C03AF4D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_6E054395668657B0A6D804186C03F54E" 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_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_6E054395668657B0A6D804186C03F54E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414" 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_StatementOfFinancialPositionAbstract_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_E5CDF3B2061661822AA004186C03DDC0" 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_StatementOfFinancialPositionAbstract_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_E5CDF3B2061661822AA004186C03DDC0" xlink:type="arc"/>
<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_FA113CF19119BAD67C0904186C03FC25" 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_StatementOfFinancialPositionAbstract_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_FA113CF19119BAD67C0904186C03FC25" 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_147DC3717284863AB21304186C04D1CF" 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_StatementOfFinancialPositionAbstract_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_147DC3717284863AB21304186C04D1CF" 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_493580F79A001EA9C0F204186C046CF7" 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_StatementOfFinancialPositionAbstract_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_CommonStockSharesIssued_493580F79A001EA9C0F204186C046CF7" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F" 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_StatementOfFinancialPositionAbstract_689A42E74BD967B4F81704186C028392" xlink:to="loc_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/CondensedConsolidatedStatementsOfCashFlows" 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_ED9DE27D5239B4CE21BD04186BD2CDE0" 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_B583435211FF8209750304186BD31D4D" xlink:type="locator"/>
<link:presentationArc order="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_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B583435211FF8209750304186BD31D4D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_7590901B4557A863E4E204186BD3BADB" xlink:type="locator"/>
<link:presentationArc order="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_B583435211FF8209750304186BD31D4D" xlink:to="loc_us-gaap_NetIncomeLoss_7590901B4557A863E4E204186BD3BADB" 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_44F279FCBA39CD6FE1EF04186BD3451C" 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_B583435211FF8209750304186BD31D4D" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" 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_DE982CD70758885F7AF604186BD4B75C" 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_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C" 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_690BCD766A3563E7301E04186BD44AFF" 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_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" 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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGain" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" 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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OperatingLeaseRightOfUseAssetAmortization" xlink:label="loc_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" 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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" 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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract" xlink:label="loc_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" 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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="loc_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" 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_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCharges" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50" 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_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C" 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_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6" 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_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125" 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_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125" 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_D452777069E72AEA3FEE04186BD73FE9" 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_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9" 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_F18F7E30B20659F382B004186BD7E1AB" 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_B583435211FF8209750304186BD31D4D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB" 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_37C7C3FFBCEFA76C179C04186BD7E374" 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_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForCapitalImprovements" xlink:label="loc_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" 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_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:to="loc_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" 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_72D330C85A7BA13A507104186BD87056" 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_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" 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_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" 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_0C46D384E1CEDF29293C04186BD89C6B" 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_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B" 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_CCE5836BCF6159F97D7F04186BD98F9F" 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_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" 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_FBB6E1E59FEB5430D97F04186BD96BDE" 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_CCE5836BCF6159F97D7F04186BD98F9F" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE" 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_160B16913F218D0D9F2604186BD91406" 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_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_160B16913F218D0D9F2604186BD91406" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D" 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_CCE5836BCF6159F97D7F04186BD98F9F" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D" 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_D9C4D55B93532123BB0E04186BDAC1C1" 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_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241" 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_StatementOfCashFlowsAbstract_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241" 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_63A41C050F008BA0028904186BDAACF0" 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_StatementOfCashFlowsAbstract_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_63A41C050F008BA0028904186BDAACF0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_38071E80CC81F1AA256504186BDAAB0C" 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_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_38071E80CC81F1AA256504186BDAAB0C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_BDF197839E52BD32776904186BDBEFF4" 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_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_BDF197839E52BD32776904186BDBEFF4" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" 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_35941F57E5E05DF52D6716F524B03E89" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_8A9A54BEBA082307BB4316F524B007B7" xlink:type="locator"/>
<link:presentationArc order="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_35941F57E5E05DF52D6716F524B03E89" xlink:to="loc_us-gaap_NetIncomeLoss_8A9A54BEBA082307BB4316F524B007B7" 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_6B69F812FBA099DFD7B116F524B0DA11" 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_35941F57E5E05DF52D6716F524B03E89" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" 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_83A43673A1F7EA821F7416F524B1EDE0" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_83A43673A1F7EA821F7416F524B1EDE0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_F1F9E1B141F83C5D01D916F524B1BFF2" 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_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_F1F9E1B141F83C5D01D916F524B1BFF2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_92769213E434DD90A4B117101C671335" 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_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_92769213E434DD90A4B117101C671335" 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_64F1C27D50DC886C6DAA16F524B14DFC" 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_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_64F1C27D50DC886C6DAA16F524B14DFC" 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_20DFEC7C7335378BF57A16F524B15693" 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_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_20DFEC7C7335378BF57A16F524B15693" 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_9852A8475BD61D165E4C16F524B139C1" 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_35941F57E5E05DF52D6716F524B03E89" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_9852A8475BD61D165E4C16F524B139C1" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/CondensedConsolidatedStatementsOfOperations" 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_82240461FA6B878B24C50332135E35A4" 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_9CD0677B45697AFF7EB90332135EF4F8" xlink:type="locator"/>
<link:presentationArc order="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_82240461FA6B878B24C50332135E35A4" xlink:to="loc_us-gaap_StatementTable_9CD0677B45697AFF7EB90332135EF4F8" 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_4EF93B8605A6F47771830332135E40ED" xlink:type="locator"/>
<link:presentationArc order="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_9CD0677B45697AFF7EB90332135EF4F8" xlink:to="loc_srt_ProductOrServiceAxis_4EF93B8605A6F47771830332135E40ED" 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_9F60097183B95384C6AD0332135E9339" xlink:type="locator"/>
<link: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_4EF93B8605A6F47771830332135E40ED" xlink:to="loc_srt_ProductsAndServicesDomain_9F60097183B95384C6AD0332135E9339" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ResearchRevenueMember" xlink:label="loc_it_ResearchRevenueMember_6C7BFC68331AE95C79230332135EF78B" xlink:type="locator"/>
<link: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_9F60097183B95384C6AD0332135E9339" xlink:to="loc_it_ResearchRevenueMember_6C7BFC68331AE95C79230332135EF78B" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EventsMember" xlink:label="loc_it_EventsMember_1F2045E2BF9D66E0B8D00332135E2E5F" 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_9F60097183B95384C6AD0332135E9339" xlink:to="loc_it_EventsMember_1F2045E2BF9D66E0B8D00332135E2E5F" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ConsultingMember" xlink:label="loc_it_ConsultingMember_8991456D607E9ABF58A70332135EDBE8" 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_9F60097183B95384C6AD0332135E9339" xlink:to="loc_it_ConsultingMember_8991456D607E9ABF58A70332135EDBE8" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherRevenueMember" xlink:label="loc_it_OtherRevenueMember_4341D65776E33B8B52200332135EDEDD" 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_9F60097183B95384C6AD0332135E9339" xlink:to="loc_it_OtherRevenueMember_4341D65776E33B8B52200332135EDEDD" 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_F216A475E5A37EF64E1B0332135E6FF0" 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_9CD0677B45697AFF7EB90332135EF4F8" xlink:to="loc_us-gaap_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" 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_8B64541B5DF2D54CF2890332135EE643" xlink:type="locator"/>
<link:presentationArc order="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_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_RevenuesAbstract_8B64541B5DF2D54CF2890332135EE643" 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_0C6F998BFC11A74312250332135E6E07" xlink:type="locator"/>
<link:presentationArc order="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_8B64541B5DF2D54CF2890332135EE643" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0C6F998BFC11A74312250332135E6E07" 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_705DDCBC7026DB46A3000332135EB550" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_705DDCBC7026DB46A3000332135EB550" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_C1B7130AEE3C0F99486F0332136E901E" xlink:type="locator"/>
<link:presentationArc order="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_705DDCBC7026DB46A3000332135EB550" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_C1B7130AEE3C0F99486F0332136E901E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_5D4B0245E463202E5F140332136E0732" 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_705DDCBC7026DB46A3000332135EB550" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_5D4B0245E463202E5F140332136E0732" 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_F53D6302E0F11E1058EE0332136E72EF" 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_705DDCBC7026DB46A3000332135EB550" xlink:to="loc_us-gaap_Depreciation_F53D6302E0F11E1058EE0332136E72EF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_D5D55D2CD639B2500C820332136E6203" 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_705DDCBC7026DB46A3000332135EB550" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_D5D55D2CD639B2500C820332136E6203" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BusinessCombinationAcquisitionandIntegrationRelatedCosts" xlink:label="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_7B420B3A89B261FF321C0332136E16C2" 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_CostsAndExpensesAbstract_705DDCBC7026DB46A3000332135EB550" xlink:to="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_7B420B3A89B261FF321C0332136E16C2" 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_D5250AE2D231D37867680332136EC517" 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_CostsAndExpensesAbstract_705DDCBC7026DB46A3000332135EB550" xlink:to="loc_us-gaap_CostsAndExpenses_D5250AE2D231D37867680332136EC517" 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_38E25488B04DC8BAE46B0332136E8E8B" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_OperatingIncomeLoss_38E25488B04DC8BAE46B0332136E8E8B" 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_FD3AEFABE4CCAD12F7010332136E73DF" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_InterestExpense_FD3AEFABE4CCAD12F7010332136E73DF" 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_67AE17B07201E39AA75B0332136EC068" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_67AE17B07201E39AA75B0332136EC068" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_6FD771233603F05C23A00332136EF8D8" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_6FD771233603F05C23A00332136EF8D8" 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_A59031EA06290EF382030332136EC527" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_A59031EA06290EF382030332136EC527" 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_7F9A1ACC923564C67B6A0332136EDE35" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_7F9A1ACC923564C67B6A0332136EDE35" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_CC9481821C8D21A4767F0332136E821F" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_NetIncomeLoss_CC9481821C8D21A4767F0332136E821F" 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_2ACA6D988FE09763E3DC0332136E4AED" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_2ACA6D988FE09763E3DC0332136E4AED" 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_FDB80876763396383BC20332136EE930" xlink:type="locator"/>
<link:presentationArc order="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_2ACA6D988FE09763E3DC0332136E4AED" xlink:to="loc_us-gaap_EarningsPerShareBasic_FDB80876763396383BC20332136EE930" 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_F37BAB1001E14A1F45CD0332136EE162" 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_2ACA6D988FE09763E3DC0332136E4AED" xlink:to="loc_us-gaap_EarningsPerShareDiluted_F37BAB1001E14A1F45CD0332136EE162" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_FFABA5F5A4BB1C0C393D0332136E6C65" 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_StatementLineItems_F216A475E5A37EF64E1B0332135E6FF0" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_FFABA5F5A4BB1C0C393D0332136E6C65" 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_48C7FAFD478F8064239D0332136E1514" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_FFABA5F5A4BB1C0C393D0332136E6C65" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_48C7FAFD478F8064239D0332136E1514" 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_606E3C9C684D10A142930332136ECE6C" 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_WeightedAverageNumberOfSharesOutstandingAbstract_FFABA5F5A4BB1C0C393D0332136E6C65" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_606E3C9C684D10A142930332136ECE6C" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/Contingencies" 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_C31DCC6307ED5AD1849E7B7A356A9E12" 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_17F39F1CE4F556389A985CECAAD8A43E" xlink:type="locator"/>
<link:presentationArc order="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_C31DCC6307ED5AD1849E7B7A356A9E12" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_17F39F1CE4F556389A985CECAAD8A43E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/ContingenciesDetails" 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_4F46343B041753EF975D1DDD7AF2D6E0" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_DE1BC0D2A98B53A8BF3F76BADFF112E6" xlink:type="locator"/>
<link:presentationArc order="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_4F46343B041753EF975D1DDD7AF2D6E0" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_DE1BC0D2A98B53A8BF3F76BADFF112E6" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/CoverPage" 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_66B0C544DFAFF249D871FECAFD972BC3" 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_6170541D04868585CFEAFECAFD98A5D7" xlink:type="locator"/>
<link: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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_DocumentType_6170541D04868585CFEAFECAFD98A5D7" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentQuarterlyReport" xlink:label="loc_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" 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_1617E017DDBA7352EFD1FECAFD98FB2A" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A" 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_DF69FF677FADE78D37C8FECAFD98085B" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_DocumentTransitionReport_DF69FF677FADE78D37C8FECAFD98085B" 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_52565A7E4F19257F80E4FECAFD99FF9B" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B" 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_C363546A5D28B7DD91B8FECAFD99B23F" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F" 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_B28F53E6D07354333585FECAFD99784D" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D" 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_C7F687F6155E01CE7BDCFECAFD99AACB" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB" 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_9D34A5607D883201B025FECAFD9945B2" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityAddressAddressLine1_9D34A5607D883201B025FECAFD9945B2" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249" 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_4432178BA439BE7100F1FECAFD9A192C" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityAddressPostalZipCode_4432178BA439BE7100F1FECAFD9A192C" 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_EAA527F862270E400A67FECAFD9A6017" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityAddressCityOrTown_EAA527F862270E400A67FECAFD9A6017" xlink:type="arc"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C" 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_07C876DE2A80D6B5906FFECAFD9A7B44" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_CityAreaCode_07C876DE2A80D6B5906FFECAFD9A7B44" 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_56B3142F40ACD7B35B6CFECAFD9B28EE" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_LocalPhoneNumber_56B3142F40ACD7B35B6CFECAFD9B28EE" 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_8F658216B9F8DA70136BFECAFD9C0753" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_Security12bTitle_8F658216B9F8DA70136BFECAFD9C0753" 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_C5BB529F751465E5DB87FECAFD9C5C26" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_TradingSymbol_C5BB529F751465E5DB87FECAFD9C5C26" 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_C87661ACC9C6447F4EF3FECAFD9DE713" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_SecurityExchangeName_C87661ACC9C6447F4EF3FECAFD9DE713" 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_F5CB8A8E03B730DD3911FECAFD9B6FCC" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityCurrentReportingStatus_F5CB8A8E03B730DD3911FECAFD9B6FCC" 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_8666D59C37BC3E84018BFECAFD9B8D22" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityInteractiveDataCurrent_8666D59C37BC3E84018BFECAFD9B8D22" 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_160D7E0FAAA2B7A2808CFECAFD9BCA32" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityFilerCategory_160D7E0FAAA2B7A2808CFECAFD9BCA32" 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_60F2BB5D7D7DD643E803FECAFD9C6DEC" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntitySmallBusiness_60F2BB5D7D7DD643E803FECAFD9C6DEC" 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_BCB1951BE82F2AF38466FECAFD9C9D8A" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityEmergingGrowthCompany_BCB1951BE82F2AF38466FECAFD9C9D8A" 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_36CD9C6E6976CF394343FECAFD9C69F7" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityShellCompany_36CD9C6E6976CF394343FECAFD9C69F7" 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_D47D2F7522B374EAEBD9FECAFD9D5AE6" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_D47D2F7522B374EAEBD9FECAFD9D5AE6" 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_1042F9A629C7D4FFBBFAFECAFD9D58A6" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_EntityCentralIndexKey_1042F9A629C7D4FFBBFAFECAFD9D58A6" 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_48AB66A7D5312F2AC872FECAFD9D9527" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_CurrentFiscalYearEndDate_48AB66A7D5312F2AC872FECAFD9D9527" 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_E3116B5956167E18AD26FECAFD9E174A" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_DocumentFiscalYearFocus_E3116B5956167E18AD26FECAFD9E174A" 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_2819C2A0772FF3054956FECAFD9EB2F1" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_DocumentFiscalPeriodFocus_2819C2A0772FF3054956FECAFD9EB2F1" 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_1138781E5357088331DFFECAFD9E678D" 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_66B0C544DFAFF249D871FECAFD972BC3" xlink:to="loc_dei_AmendmentFlag_1138781E5357088331DFFECAFD9E678D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_DC809A2418CD573995C920C5D6BDCE52" 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_DC05016C7BAB5E76A9EF87851F56F03D" xlink:type="locator"/>
<link:presentationArc order="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_DC809A2418CD573995C920C5D6BDCE52" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_DC05016C7BAB5E76A9EF87851F56F03D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/DebtBorrowingsDetails" 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_266D47268B84516AA25A2E3B220D1C9D" 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_906ECDCD1FA452BCAB02FCD3CA98D867" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_266D47268B84516AA25A2E3B220D1C9D" xlink:to="loc_us-gaap_DebtInstrumentTable_906ECDCD1FA452BCAB02FCD3CA98D867" 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_9060C0CF687A5CBF8564095E864615B3" xlink:type="locator"/>
<link:presentationArc order="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_906ECDCD1FA452BCAB02FCD3CA98D867" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9060C0CF687A5CBF8564095E864615B3" 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_4313BB1E18095DF2B35849CAC0F575E3" xlink:type="locator"/>
<link:presentationArc order="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_9060C0CF687A5CBF8564095E864615B3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4313BB1E18095DF2B35849CAC0F575E3" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BankTermLoanMember" xlink:label="loc_it_BankTermLoanMember_3E3314C52CD954588FAC70ED6F21D3D6" xlink:type="locator"/>
<link:presentationArc order="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_4313BB1E18095DF2B35849CAC0F575E3" xlink:to="loc_it_BankTermLoanMember_3E3314C52CD954588FAC70ED6F21D3D6" 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_94F3608800E95E3DAB50E0DDC73063A2" 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_4313BB1E18095DF2B35849CAC0F575E3" xlink:to="loc_us-gaap_SeniorNotesMember_94F3608800E95E3DAB50E0DDC73063A2" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherLongTermDebtMember" xlink:label="loc_it_OtherLongTermDebtMember_E8401843031E5167B6F43C0394D7FDA2" 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_4313BB1E18095DF2B35849CAC0F575E3" xlink:to="loc_it_OtherLongTermDebtMember_E8401843031E5167B6F43C0394D7FDA2" 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_F4F2777473B55100858DED8F7D8F9EC1" 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_906ECDCD1FA452BCAB02FCD3CA98D867" xlink:to="loc_us-gaap_CreditFacilityAxis_F4F2777473B55100858DED8F7D8F9EC1" 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_2A9ED20FEFDA5EC882D58CFB923ABB11" xlink:type="locator"/>
<link:presentationArc order="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_F4F2777473B55100858DED8F7D8F9EC1" xlink:to="loc_us-gaap_CreditFacilityDomain_2A9ED20FEFDA5EC882D58CFB923ABB11" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_BD47AD68F37F5B2FB249D442B752EE50" xlink:type="locator"/>
<link:presentationArc order="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_2A9ED20FEFDA5EC882D58CFB923ABB11" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_BD47AD68F37F5B2FB249D442B752EE50" 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_F70270559FC35F2F835497E0833AF0F3" xlink:type="locator"/>
<link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_906ECDCD1FA452BCAB02FCD3CA98D867" xlink:to="loc_us-gaap_DebtInstrumentLineItems_F70270559FC35F2F835497E0833AF0F3" 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_ED484D13D5B75F4F865AF2E0BBCB968D" xlink:type="locator"/>
<link:presentationArc order="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_F70270559FC35F2F835497E0833AF0F3" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_ED484D13D5B75F4F865AF2E0BBCB968D" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtLongtermandShorttermCombinedAmountGross" xlink:label="loc_it_DebtLongtermandShorttermCombinedAmountGross_E53732C07F635D75965C9C49C0B948FA" 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_us-gaap_DebtInstrumentLineItems_F70270559FC35F2F835497E0833AF0F3" xlink:to="loc_it_DebtLongtermandShorttermCombinedAmountGross_E53732C07F635D75965C9C49C0B948FA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet" xlink:label="loc_us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet_FE919F4520685C699F8ACA0F0C1CCC8D" 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_DebtInstrumentLineItems_F70270559FC35F2F835497E0833AF0F3" xlink:to="loc_us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet_FE919F4520685C699F8ACA0F0C1CCC8D" 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_4B3A8764A4F8577FAB676F6D2F3D1051" 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_DebtInstrumentLineItems_F70270559FC35F2F835497E0833AF0F3" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_4B3A8764A4F8577FAB676F6D2F3D1051" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/DebtFootnoteToBorrowingsDetails" 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_69F524121A25400D6154D59FCB1D65FA" 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_BD93EF25E3C23437E4B6D59FCB1D59B2" xlink:type="locator"/>
<link:presentationArc order="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_69F524121A25400D6154D59FCB1D65FA" xlink:to="loc_us-gaap_DebtInstrumentTable_BD93EF25E3C23437E4B6D59FCB1D59B2" 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_C884C13DBB7DB30F3D7DD59FCB1DAC24" xlink:type="locator"/>
<link:presentationArc order="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_BD93EF25E3C23437E4B6D59FCB1D59B2" xlink:to="loc_us-gaap_DebtInstrumentAxis_C884C13DBB7DB30F3D7DD59FCB1DAC24" 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_E5D09A49E6B6678418F1D59FCB1DA2CB" xlink:type="locator"/>
<link:presentationArc order="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_C884C13DBB7DB30F3D7DD59FCB1DAC24" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_E5D09A49E6B6678418F1D59FCB1DA2CB" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EconomicDevelopmentLoan1Member" xlink:label="loc_it_EconomicDevelopmentLoan1Member_58E7BD31DF0E38371B61D59FCB1D696B" xlink:type="locator"/>
<link:presentationArc order="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_E5D09A49E6B6678418F1D59FCB1DA2CB" xlink:to="loc_it_EconomicDevelopmentLoan1Member_58E7BD31DF0E38371B61D59FCB1D696B" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EconomicDevelopmentLoan2Member" xlink:label="loc_it_EconomicDevelopmentLoan2Member_CDE8BA81BCE4D70339F1D59FCB1EC5F0" 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_E5D09A49E6B6678418F1D59FCB1DA2CB" xlink:to="loc_it_EconomicDevelopmentLoan2Member_CDE8BA81BCE4D70339F1D59FCB1EC5F0" 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_BFAB867B802C9954DB82D59FCB1E52DF" 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_BD93EF25E3C23437E4B6D59FCB1D59B2" xlink:to="loc_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF" 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_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:type="locator"/>
<link:presentationArc order="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_BFAB867B802C9954DB82D59FCB1E52DF" xlink:to="loc_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" xlink:type="locator"/>
<link:presentationArc order="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_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" 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_5EB4CBC21B91EEB2EBE1D59FCB1E4100" 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_BD93EF25E3C23437E4B6D59FCB1D59B2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5EB4CBC21B91EEB2EBE1D59FCB1E4100" 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_9ACDCB8D05BF84A6FD1BD59FCB1ED2CD" xlink:type="locator"/>
<link:presentationArc order="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_5EB4CBC21B91EEB2EBE1D59FCB1E4100" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9ACDCB8D05BF84A6FD1BD59FCB1ED2CD" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BankTermLoanMember" xlink:label="loc_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:type="locator"/>
<link:presentationArc order="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_9ACDCB8D05BF84A6FD1BD59FCB1ED2CD" xlink:to="loc_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" 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_AB797D6147B9DF05B605D59FCB1F2864" 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_9ACDCB8D05BF84A6FD1BD59FCB1ED2CD" xlink:to="loc_us-gaap_SeniorNotesMember_AB797D6147B9DF05B605D59FCB1F2864" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ConnecticutEconomicDevelopmentProgramMember" xlink:label="loc_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" 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_9ACDCB8D05BF84A6FD1BD59FCB1ED2CD" xlink:to="loc_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" 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_A9A7797C9A79460D5B2DD59FCB1F186D" 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_BD93EF25E3C23437E4B6D59FCB1D59B2" xlink:to="loc_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:type="locator"/>
<link:presentationArc order="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_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_FloatingEurodollarBaseRate" xlink:label="loc_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" 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_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentAdditionalInterestaboveBaseRate" xlink:label="loc_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" 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_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" 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_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" 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_04EB1A1F406F58434E98D59FCB204A22" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_04EB1A1F406F58434E98D59FCB204A22" 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_D9E483D09986504F4AA4D59FCB20300B" 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_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_NumberOfDebtInstruments" xlink:label="loc_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" 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_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" 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_01E2770154482C655858D59FCB21873F" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_01E2770154482C655858D59FCB21873F" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred" xlink:label="loc_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentPossibleForgiveness" xlink:label="loc_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentPossibleForgivenessPeriod" xlink:label="loc_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9" 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_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/DebtInterestRateSwapsDetails" 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_438D2711D02CB661EE53D0AE1A35DEC5" 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_0A5158A3DB15782A34FED0AE1A36A578" xlink:type="locator"/>
<link:presentationArc order="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_438D2711D02CB661EE53D0AE1A35DEC5" xlink:to="loc_us-gaap_DerivativeTable_0A5158A3DB15782A34FED0AE1A36A578" 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_E7AAA1638D614FD1F955D0AE1A369A36" xlink:type="locator"/>
<link:presentationArc order="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_0A5158A3DB15782A34FED0AE1A36A578" xlink:to="loc_srt_RangeAxis_E7AAA1638D614FD1F955D0AE1A369A36" 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_E0A826B359670789F06AD0AE1A366C73" xlink:type="locator"/>
<link: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_E7AAA1638D614FD1F955D0AE1A369A36" xlink:to="loc_srt_RangeMember_E0A826B359670789F06AD0AE1A366C73" 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_0BD53EF83C1A15AFAC37D0AE1A37C6A7" xlink:type="locator"/>
<link: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_E0A826B359670789F06AD0AE1A366C73" xlink:to="loc_srt_MinimumMember_0BD53EF83C1A15AFAC37D0AE1A37C6A7" 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_52CF06BBB0F0F9D73E6ED0AE1A37CAD2" 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_E0A826B359670789F06AD0AE1A366C73" xlink:to="loc_srt_MaximumMember_52CF06BBB0F0F9D73E6ED0AE1A37CAD2" 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_82D8829183A268B178F8D0AE1A3784B8" 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_0A5158A3DB15782A34FED0AE1A36A578" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_82D8829183A268B178F8D0AE1A3784B8" 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_445B8CE96E8569B3E5B1D0AE1A370DA2" xlink:type="locator"/>
<link:presentationArc order="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_82D8829183A268B178F8D0AE1A3784B8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_445B8CE96E8569B3E5B1D0AE1A370DA2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C" xlink:type="locator"/>
<link:presentationArc order="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_445B8CE96E8569B3E5B1D0AE1A370DA2" xlink:to="loc_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C" 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_90CEA99DA4E318D12B0FD0AE1A38AE5A" 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_0A5158A3DB15782A34FED0AE1A36A578" xlink:to="loc_us-gaap_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD" xlink:type="locator"/>
<link:presentationArc order="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_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD" 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_C56972D0C90794737D01D0AE1A383C4A" 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_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:to="loc_us-gaap_DerivativeNotionalAmount_C56972D0C90794737D01D0AE1A383C4A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFixedInterestRate" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_057DD52A9235E00C1A15D0AE1A38CDB5" 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_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_057DD52A9235E00C1A15D0AE1A38CDB5" 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_276528EEB93D8C16D688D0AE1A390FC2" 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_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:to="loc_us-gaap_DerivativeTermOfContract_276528EEB93D8C16D688D0AE1A390FC2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet" xlink:label="loc_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA" 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_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:to="loc_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_23075D9A21055AFDCCED16F522FAF18D" 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_8A3191E18A66FCBE4F5616F522FADA7A" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_23075D9A21055AFDCCED16F522FAF18D" xlink:to="loc_us-gaap_DebtInstrumentTable_8A3191E18A66FCBE4F5616F522FADA7A" 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_AD4748C0E52931E1192916F522FA19DF" xlink:type="locator"/>
<link:presentationArc order="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_8A3191E18A66FCBE4F5616F522FADA7A" xlink:to="loc_us-gaap_DebtInstrumentAxis_AD4748C0E52931E1192916F522FA19DF" 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_AFD4DF11E80D193BC05816F522FBDB02" xlink:type="locator"/>
<link:presentationArc order="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_AD4748C0E52931E1192916F522FA19DF" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_AFD4DF11E80D193BC05816F522FBDB02" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_A2016CreditFacilityAgreementMember" xlink:label="loc_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:type="locator"/>
<link:presentationArc order="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_AFD4DF11E80D193BC05816F522FBDB02" xlink:to="loc_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BankTermLoanMember" xlink:label="loc_it_BankTermLoanMember_FFA1F8722FDE1C94A6F816F522FB1BBE" 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_AFD4DF11E80D193BC05816F522FBDB02" xlink:to="loc_it_BankTermLoanMember_FFA1F8722FDE1C94A6F816F522FB1BBE" 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_2F7FBD0C9C90077B655A16F522FB3BB1" 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_8A3191E18A66FCBE4F5616F522FADA7A" xlink:to="loc_us-gaap_CreditFacilityAxis_2F7FBD0C9C90077B655A16F522FB3BB1" 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_971EC793042237A120F816F52301477E" xlink:type="locator"/>
<link:presentationArc order="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_2F7FBD0C9C90077B655A16F522FB3BB1" xlink:to="loc_us-gaap_CreditFacilityDomain_971EC793042237A120F816F52301477E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:type="locator"/>
<link:presentationArc order="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_971EC793042237A120F816F52301477E" xlink:to="loc_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_4C2504A3C746BE4E57F816F52301CD95" 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_971EC793042237A120F816F52301477E" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_4C2504A3C746BE4E57F816F52301CD95" 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_9449F8FCD5FE6396C19416F523012A1D" 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_8A3191E18A66FCBE4F5616F522FADA7A" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9449F8FCD5FE6396C19416F523012A1D" 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_1D6CF468893B8CB5DDF316F523028222" xlink:type="locator"/>
<link:presentationArc order="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_9449F8FCD5FE6396C19416F523012A1D" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1D6CF468893B8CB5DDF316F523028222" xlink:type="arc"/>
<link:presentationArc order="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_1D6CF468893B8CB5DDF316F523028222" xlink:to="loc_it_BankTermLoanMember_FFA1F8722FDE1C94A6F816F522FB1BBE" 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_A153FFFF0A49E586D44F16F523023642" 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_1D6CF468893B8CB5DDF316F523028222" xlink:to="loc_us-gaap_SeniorNotesMember_A153FFFF0A49E586D44F16F523023642" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" 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_8A3191E18A66FCBE4F5616F522FADA7A" xlink:to="loc_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:to="loc_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_FederalFundsRateMember" xlink:label="loc_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:to="loc_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EuroDollarRateMember" xlink:label="loc_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" 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_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:to="loc_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" 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_8A3191E18A66FCBE4F5616F522FADA7A" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" 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_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" 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_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" 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_D937A1DCE836A227E59216F52304BDF1" xlink:type="locator"/>
<link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_8A3191E18A66FCBE4F5616F522FADA7A" xlink:to="loc_us-gaap_DebtInstrumentLineItems_D937A1DCE836A227E59216F52304BDF1" 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_6CC84978F87343F4010216F523049DEF" xlink:type="locator"/>
<link:presentationArc order="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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments" xlink:label="loc_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" 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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate" xlink:label="loc_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" 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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate" xlink:label="loc_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" 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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_MinimumApplicableMarginRate" xlink:label="loc_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" 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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_MaximumApplicableMarginRate" xlink:label="loc_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" 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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" 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_B7586FBE6DB6A3C6141116F523052528" 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_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528" 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_DEEEC5704E5F7B67ED2216F523052936" 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_DebtInstrumentLineItems_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_DEEEC5704E5F7B67ED2216F523052936" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentIssuePricePercent" xlink:label="loc_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" 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_DebtInstrumentLineItems_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed" xlink:label="loc_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" 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_DebtInstrumentLineItems_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD" 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_DebtInstrumentLineItems_D937A1DCE836A227E59216F52304BDF1" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_17243A1FCC2754F9B6A16266BC947C4C" 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_3AEAB776385E5CF58560DB88FDE46BD5" xlink:type="locator"/>
<link:presentationArc order="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_17243A1FCC2754F9B6A16266BC947C4C" xlink:to="loc_us-gaap_ScheduleOfDebtTableTextBlock_3AEAB776385E5CF58560DB88FDE46BD5" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_687EDF98960D5A10908FD868943EC6B4" 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_8FBE80BBB7F65FD88177A273FD513132" xlink:type="locator"/>
<link:presentationArc order="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_687EDF98960D5A10908FD868943EC6B4" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_8FBE80BBB7F65FD88177A273FD513132" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/DerivativesAndHedgingAmountsRecognizedInCondensedConsolidatedStatementsOfOperationsForDerivativeContractsDetails" 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_5EFF70C3B8595FCBA4D3111D18DFB172" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_14C218BE701A55FB96F56B4045CA5994" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_5EFF70C3B8595FCBA4D3111D18DFB172" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_14C218BE701A55FB96F56B4045CA5994" 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_20F4556A9A5A5743AA8BD2F5C4A3CD88" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_14C218BE701A55FB96F56B4045CA5994" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_20F4556A9A5A5743AA8BD2F5C4A3CD88" 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_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:type="locator"/>
<link:presentationArc order="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_20F4556A9A5A5743AA8BD2F5C4A3CD88" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_InterestIncomeExpenseMember" xlink:label="loc_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:type="locator"/>
<link:presentationArc order="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_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:to="loc_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherGainLossNetMember" xlink:label="loc_it_OtherGainLossNetMember_47A622C5109250F5A11ECAC12499D9F5" 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_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:to="loc_it_OtherGainLossNetMember_47A622C5109250F5A11ECAC12499D9F5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_14C218BE701A55FB96F56B4045CA5994" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" 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_8B2E6EFAE69858C5A590A718B7A085A3" 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_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_8B2E6EFAE69858C5A590A718B7A085A3" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/DerivativesAndHedgingOutstandingDerivativesContractsDetails" 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_9E1E1FED28711D9E9C9816F52238A3FF" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_9E1E1FED28711D9E9C9816F52238A3FF" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" 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_2418A6ADBC6756B5B49B16F522397FB3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" xlink:to="loc_us-gaap_HedgingDesignationAxis_2418A6ADBC6756B5B49B16F522397FB3" 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_1DE71895BFE272E9088516F52239BBBB" xlink:type="locator"/>
<link:presentationArc order="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_2418A6ADBC6756B5B49B16F522397FB3" xlink:to="loc_us-gaap_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB" 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_9FC2171A0F07E6D25F4316F52239B06F" xlink:type="locator"/>
<link:presentationArc order="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_1DE71895BFE272E9088516F52239BBBB" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_9FC2171A0F07E6D25F4316F52239B06F" 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_8D6561610A5A763E249416F5223ADB6A" 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_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB" xlink:to="loc_us-gaap_NondesignatedMember_8D6561610A5A763E249416F5223ADB6A" 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_289E7F7EA59FE940096316F5223A3B2C" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_289E7F7EA59FE940096316F5223A3B2C" 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_ABF56C8FF0EAFB3B56EA16F5223A75DE" xlink:type="locator"/>
<link:presentationArc order="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_289E7F7EA59FE940096316F5223A3B2C" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ABF56C8FF0EAFB3B56EA16F5223A75DE" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesMember" xlink:label="loc_us-gaap_OtherLiabilitiesMember_AE9235446DD304F0394216F5223A1DE0" xlink:type="locator"/>
<link:presentationArc order="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_ABF56C8FF0EAFB3B56EA16F5223A75DE" xlink:to="loc_us-gaap_OtherLiabilitiesMember_AE9235446DD304F0394216F5223A1DE0" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_AccruedLiabilitiesCurrentMember" xlink:label="loc_it_AccruedLiabilitiesCurrentMember_7B9E17C08D1BD66EEA7A16F522409443" 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_ABF56C8FF0EAFB3B56EA16F5223A75DE" xlink:to="loc_it_AccruedLiabilitiesCurrentMember_7B9E17C08D1BD66EEA7A16F522409443" 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_BDA572740A6C1DA6557716F522407FC1" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_BDA572740A6C1DA6557716F522407FC1" 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_38D03106CAB70E393B5C16F52240EBBC" xlink:type="locator"/>
<link:presentationArc order="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_BDA572740A6C1DA6557716F522407FC1" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_38D03106CAB70E393B5C16F52240EBBC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_4EA189CE5FEAC76495C016F52241B08A" xlink:type="locator"/>
<link:presentationArc order="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_38D03106CAB70E393B5C16F52240EBBC" xlink:to="loc_us-gaap_InterestRateSwapMember_4EA189CE5FEAC76495C016F52241B08A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_963D3A82BA0443AF608A16F5224163F4" 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_DerivativeContractTypeDomain_38D03106CAB70E393B5C16F52240EBBC" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_963D3A82BA0443AF608A16F5224163F4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:type="locator"/>
<link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" xlink:to="loc_us-gaap_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_C6D3392B6C7F9B4E156116F5224126E8" 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_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_C6D3392B6C7F9B4E156116F5224126E8" 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_60DE802E44117D4F893616F52242CBFD" 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_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:to="loc_us-gaap_DerivativeNotionalAmount_60DE802E44117D4F893616F52242CBFD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9301F2CB507255A4C0EA16F522422B84" 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_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9301F2CB507255A4C0EA16F522422B84" 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_23DF8C9E24058907367D16F5224270AA" 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_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_23DF8C9E24058907367D16F5224270AA" 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_CB67EEA768A3D1D81751170D76D7D7BD" 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_DerivativesFairValueLineItems_A239F54E6330F62C5B3216F52241C97B" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_CB67EEA768A3D1D81751170D76D7D7BD" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_C327F5A2D0BB50869E4C378AD31AE63C" 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_FCD231B236935C7EB9F55E599358BB6B" xlink:type="locator"/>
<link:presentationArc order="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_C327F5A2D0BB50869E4C378AD31AE63C" xlink:to="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_FCD231B236935C7EB9F55E599358BB6B" 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_2F9133D4995256728B124B38EB9F18AC" 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_C327F5A2D0BB50869E4C378AD31AE63C" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_2F9133D4995256728B124B38EB9F18AC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_E0ED1D091F4A509D91B3080018EAAD0A" 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_1721C63FA0865439B1D10E986C08D7D7" xlink:type="locator"/>
<link:presentationArc order="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_E0ED1D091F4A509D91B3080018EAAD0A" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_1721C63FA0865439B1D10E986C08D7D7" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/EmployeeBenefitsDetails" 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_D32DEE0198CDDD076909D5CF3637ACC6" xlink:type="locator"/>
<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_125B1B572D6B093388DED5CF3637E960" xlink:type="locator"/>
<link:presentationArc order="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_D32DEE0198CDDD076909D5CF3637ACC6" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_125B1B572D6B093388DED5CF3637E960" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/Equity" 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_54C4312D9C135890956BC9DECA7CFCCA" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_4B6AEA65682558759B9C937E75E1C4FE" xlink:type="locator"/>
<link:presentationArc order="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_54C4312D9C135890956BC9DECA7CFCCA" xlink:to="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_4B6AEA65682558759B9C937E75E1C4FE" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/EquityChangesInAociLByComponentDetails" 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_A6C861B3E17ACC6ADE460332120B593A" 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_8CA6FA1735E5458F464F0332120B8ED5" xlink:type="locator"/>
<link:presentationArc order="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_A6C861B3E17ACC6ADE460332120B593A" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_8CA6FA1735E5458F464F0332120B8ED5" 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_1E588C723528F066EE800332120B4275" xlink:type="locator"/>
<link:presentationArc order="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_8CA6FA1735E5458F464F0332120B8ED5" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_1E588C723528F066EE800332120B4275" 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_74C4D0C740CCD1971EDF0332120B9EFA" xlink:type="locator"/>
<link:presentationArc order="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_1E588C723528F066EE800332120B4275" xlink:to="loc_us-gaap_TypeOfAdoptionMember_74C4D0C740CCD1971EDF0332120B9EFA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201802Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201802Member_0E86B860F1FAB93727670332120B8848" 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_TypeOfAdoptionMember_74C4D0C740CCD1971EDF0332120B9EFA" xlink:to="loc_us-gaap_AccountingStandardsUpdate201802Member_0E86B860F1FAB93727670332120B8848" 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_991E63FFCCD46CD76BED0332120BAC25" 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_8CA6FA1735E5458F464F0332120B8ED5" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_991E63FFCCD46CD76BED0332120BAC25" 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_CD75FAA4B86330A8F47E0332120B7945" xlink:type="locator"/>
<link:presentationArc order="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_991E63FFCCD46CD76BED0332120BAC25" xlink:to="loc_us-gaap_EquityComponentDomain_CD75FAA4B86330A8F47E0332120B7945" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_0CDC928E2E1272B2FFDA0332120B0F3B" xlink:type="locator"/>
<link:presentationArc order="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_CD75FAA4B86330A8F47E0332120B7945" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_0CDC928E2E1272B2FFDA0332120B0F3B" 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_61378B875AB12F966C610332120B5357" 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_CD75FAA4B86330A8F47E0332120B7945" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_61378B875AB12F966C610332120B5357" 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_4E406C3C97A57E45F7B40332120BA867" 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_CD75FAA4B86330A8F47E0332120B7945" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_4E406C3C97A57E45F7B40332120BA867" 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_000C371379011366A25D0332121BEB9D" 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_CD75FAA4B86330A8F47E0332120B7945" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_000C371379011366A25D0332121BEB9D" 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_7FFAF9273194E901F86E0332121B43CA" 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_EquityComponentDomain_CD75FAA4B86330A8F47E0332120B7945" xlink:to="loc_us-gaap_RetainedEarningsMember_7FFAF9273194E901F86E0332121B43CA" 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_4AFF44789B1875190DA30332121B7786" 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_AccumulatedOtherComprehensiveIncomeLossTable_8CA6FA1735E5458F464F0332120B8ED5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_4AFF44789B1875190DA30332121B7786" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:type="locator"/>
<link:presentationArc order="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_4AFF44789B1875190DA30332121B7786" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" 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_23C3C50B39455C15623C0332121BABF4" 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_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:to="loc_us-gaap_StockholdersEquity_23C3C50B39455C15623C0332121BABF4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_273041ACDACE1A7FB5CD0332121CF5EC" 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_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_273041ACDACE1A7FB5CD0332121CF5EC" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_19C920140812860B59750332121CA3C1" 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_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_19C920140812860B59750332121CA3C1" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_C06A3955C8A06AA792190332121C2AE1" 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_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_C06A3955C8A06AA792190332121C2AE1" 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_08CB85B642ACAAC0B44F0332121C0AEB" 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_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_08CB85B642ACAAC0B44F0332121C0AEB" 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_FAE836BC6ADFFD7881380332121C4A5D" 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_AOCIAttributableToParentNetOfTaxRollForward_1AD107E358EB32C357680332121B44A7" xlink:to="loc_us-gaap_StockholdersEquity_FAE836BC6ADFFD7881380332121C4A5D" 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_992F9502359BBC5CC95303950EC1CA02" 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_AccumulatedOtherComprehensiveIncomeLossLineItems_4AFF44789B1875190DA30332121B7786" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_992F9502359BBC5CC95303950EC1CA02" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/EquityShareRepurchaseProgramAndShareRepurchaseActivityDetails" 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_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:type="locator"/>
<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_6813FC8946A63675F36ED0AE1A1A0970" xlink:type="locator"/>
<link:presentationArc order="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_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970" 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_144CF6D415CAB44BB057D0AE1A1A0485" 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_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_144CF6D415CAB44BB057D0AE1A1A0485" 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_274FB7B68B996698A2FED0AE1A1A068C" 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_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_274FB7B68B996698A2FED0AE1A1A068C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" 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_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_TreasuryStockAveragePricePaidPerShare" xlink:label="loc_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77" 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_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:to="loc_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/EquityStockholdersEquityDetails" 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_C94AC6719634BB020D2C033212229F19" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_AF2C42EF85B43407D3C0033212228805" xlink:type="locator"/>
<link:presentationArc order="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_C94AC6719634BB020D2C033212229F19" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_AF2C42EF85B43407D3C0033212228805" 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_B20427084B9FF52EE019033212224176" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_AF2C42EF85B43407D3C0033212228805" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_B20427084B9FF52EE019033212224176" 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_18D57E22A4D3EE91EAB303321222E6F5" xlink:type="locator"/>
<link:presentationArc order="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_B20427084B9FF52EE019033212224176" xlink:to="loc_us-gaap_TypeOfAdoptionMember_18D57E22A4D3EE91EAB303321222E6F5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201802Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201802Member_D1D5FD27A31CCD5E0E1203321222A274" xlink:type="locator"/>
<link:presentationArc order="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_18D57E22A4D3EE91EAB303321222E6F5" xlink:to="loc_us-gaap_AccountingStandardsUpdate201802Member_D1D5FD27A31CCD5E0E1203321222A274" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201616Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201616Member_053128D85350A5107B7F033212230612" 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_18D57E22A4D3EE91EAB303321222E6F5" xlink:to="loc_us-gaap_AccountingStandardsUpdate201616Member_053128D85350A5107B7F033212230612" 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_2511803E3EB803FECC29033212233E2C" 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_ScheduleOfStockByClassTable_AF2C42EF85B43407D3C0033212228805" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2511803E3EB803FECC29033212233E2C" 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_420D5CE136935CD45F4D033212238140" xlink:type="locator"/>
<link:presentationArc order="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_2511803E3EB803FECC29033212233E2C" xlink:to="loc_us-gaap_EquityComponentDomain_420D5CE136935CD45F4D033212238140" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_EFB716F4C964B757B830033212234BCB" xlink:type="locator"/>
<link:presentationArc order="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_420D5CE136935CD45F4D033212238140" xlink:to="loc_us-gaap_CommonStockMember_EFB716F4C964B757B830033212234BCB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" 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_420D5CE136935CD45F4D033212238140" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" 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_83D15097AC455C415301033212244730" 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_420D5CE136935CD45F4D033212238140" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_83D15097AC455C415301033212244730" 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_886633A97E74E582A71D033212247E93" 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_420D5CE136935CD45F4D033212238140" xlink:to="loc_us-gaap_RetainedEarningsMember_886633A97E74E582A71D033212247E93" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" 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_EquityComponentDomain_420D5CE136935CD45F4D033212238140" xlink:to="loc_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" 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_ScheduleOfStockByClassTable_AF2C42EF85B43407D3C0033212228805" xlink:to="loc_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" 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_BD6A03CFC2B52C2F699803321224DBAB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" 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_45435499810998279CC8033212259625" 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_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_StockholdersEquity_45435499810998279CC8033212259625" 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_DF9BAD55AA04BAFBF55E033212253AE5" 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_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_DF9BAD55AA04BAFBF55E033212253AE5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_D2CB166060D3D1EF3CB8033212255CD2" 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_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_NetIncomeLoss_D2CB166060D3D1EF3CB8033212255CD2" 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_A3CE97D1792E6676AE4D033212258B03" 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_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A3CE97D1792E6676AE4D033212258B03" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" 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_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" 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_9D8B1CC3B682C825BA9D03321226A1F7" 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_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7" 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_B3C0FA678E12A47AD87403321226114C" 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_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C" 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_C570AFDC9BF587D9423403321226590D" xlink:type="locator"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="loc_us-gaap_StockholdersEquity_C570AFDC9BF587D9423403321226590D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/EquityTables" 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_495BD13A325F5462A5BB9D366B130310" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfTreasuryStockByClassTextBlock" xlink:label="loc_us-gaap_ScheduleOfTreasuryStockByClassTextBlock_35BDA52A2E685545B12B0D194E254A22" xlink:type="locator"/>
<link:presentationArc order="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_495BD13A325F5462A5BB9D366B130310" xlink:to="loc_us-gaap_ScheduleOfTreasuryStockByClassTextBlock_35BDA52A2E685545B12B0D194E254A22" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockholdersEquityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfStockholdersEquityTableTextBlock_47F56CA1EF4D58508D1005064916C0EA" 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_StockholdersEquityNoteAbstract_495BD13A325F5462A5BB9D366B130310" xlink:to="loc_us-gaap_ScheduleOfStockholdersEquityTableTextBlock_47F56CA1EF4D58508D1005064916C0EA" 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_71317111CF0D5998BE96456F85606683" 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_StockholdersEquityNoteAbstract_495BD13A325F5462A5BB9D366B130310" xlink:to="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_71317111CF0D5998BE96456F85606683" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/FairValueDisclosures" 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_E5EEDC864F8C526FA1E09F38011C6A0F" 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_33B2CAC40FAF567396BB6A99D8491F0A" xlink:type="locator"/>
<link:presentationArc order="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_E5EEDC864F8C526FA1E09F38011C6A0F" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_33B2CAC40FAF567396BB6A99D8491F0A" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/FairValueDisclosuresAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" 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_0C9048E17B8B564CBD9F03145A70F02E" 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_1C1E5160AD675CAEB13DAFB6BAF74A0A" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_0C9048E17B8B564CBD9F03145A70F02E" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1C1E5160AD675CAEB13DAFB6BAF74A0A" 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_8BD9C0FFB2BA50BCBAF09C09A85606B8" xlink:type="locator"/>
<link:presentationArc order="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_1C1E5160AD675CAEB13DAFB6BAF74A0A" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_8BD9C0FFB2BA50BCBAF09C09A85606B8" 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_721F30808E3B50F09B29E35AEF63FB54" xlink:type="locator"/>
<link:presentationArc order="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_8BD9C0FFB2BA50BCBAF09C09A85606B8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_721F30808E3B50F09B29E35AEF63FB54" 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_90E5B23657C2544B84B3CFB42C5AF1E7" xlink:type="locator"/>
<link:presentationArc order="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_721F30808E3B50F09B29E35AEF63FB54" xlink:to="loc_us-gaap_SeniorNotesMember_90E5B23657C2544B84B3CFB42C5AF1E7" 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_8302F86FF70F5142BD68F8E843229006" 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_1C1E5160AD675CAEB13DAFB6BAF74A0A" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8302F86FF70F5142BD68F8E843229006" 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_69B00A9D6C455F88B579F68B175B6E5F" xlink:type="locator"/>
<link:presentationArc order="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_8302F86FF70F5142BD68F8E843229006" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69B00A9D6C455F88B579F68B175B6E5F" 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_31DA4ED609685E0C89AF2A676FE41F57" xlink:type="locator"/>
<link:presentationArc order="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_69B00A9D6C455F88B579F68B175B6E5F" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_31DA4ED609685E0C89AF2A676FE41F57" 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_B57FC900F28058449FA71848BD733FEA" 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_69B00A9D6C455F88B579F68B175B6E5F" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_B57FC900F28058449FA71848BD733FEA" 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_CEEC313BF83C5B208DFB0E75567BA75D" 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_1C1E5160AD675CAEB13DAFB6BAF74A0A" xlink:to="loc_us-gaap_FinancialInstrumentAxis_CEEC313BF83C5B208DFB0E75567BA75D" 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_393AF4232F7B5697B63E7DA441C24BD5" xlink:type="locator"/>
<link:presentationArc order="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_CEEC313BF83C5B208DFB0E75567BA75D" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_393AF4232F7B5697B63E7DA441C24BD5" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_PlanAssetsMember" xlink:label="loc_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:type="locator"/>
<link:presentationArc order="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_393AF4232F7B5697B63E7DA441C24BD5" xlink:to="loc_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_PlanLiabilitiesMember" xlink:label="loc_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" 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_393AF4232F7B5697B63E7DA441C24BD5" xlink:to="loc_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtMember" xlink:label="loc_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" 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_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_393AF4232F7B5697B63E7DA441C24BD5" xlink:to="loc_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" 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_E7EA8D2C411056AF967AA8C5AB3AD861" 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_1C1E5160AD675CAEB13DAFB6BAF74A0A" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_E7EA8D2C411056AF967AA8C5AB3AD861" 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_5BD616BB0849578FA28DCE9B38B88927" xlink:type="locator"/>
<link:presentationArc order="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_E7EA8D2C411056AF967AA8C5AB3AD861" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5BD616BB0849578FA28DCE9B38B88927" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" 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_DerivativeContractTypeDomain_5BD616BB0849578FA28DCE9B38B88927" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_6265DECA47ED5D1CBB0A55BAD0EC2F2D" 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_DerivativeContractTypeDomain_5BD616BB0849578FA28DCE9B38B88927" xlink:to="loc_us-gaap_InterestRateSwapMember_6265DECA47ED5D1CBB0A55BAD0EC2F2D" 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_2D86F063C08852E897E8A3DE6AB6CF08" xlink:type="locator"/>
<link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1C1E5160AD675CAEB13DAFB6BAF74A0A" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2D86F063C08852E897E8A3DE6AB6CF08" 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_81633E11472654C999B425C0FC905311" xlink:type="locator"/>
<link:presentationArc order="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_2D86F063C08852E897E8A3DE6AB6CF08" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_81633E11472654C999B425C0FC905311" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_A0C31ECE59BC5365934B444625C1F2CE" xlink:type="locator"/>
<link:presentationArc order="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_81633E11472654C999B425C0FC905311" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_A0C31ECE59BC5365934B444625C1F2CE" 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_F7645857729451FFAEFBBDA15F8AD1FA" 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_2D86F063C08852E897E8A3DE6AB6CF08" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_F7645857729451FFAEFBBDA15F8AD1FA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_63B52EB99B1D502DA05458953E27A2BF" xlink:type="locator"/>
<link:presentationArc order="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_F7645857729451FFAEFBBDA15F8AD1FA" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_63B52EB99B1D502DA05458953E27A2BF" 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_BED422E36B20581FAE1F088FD5D2D136" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2D86F063C08852E897E8A3DE6AB6CF08" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_BED422E36B20581FAE1F088FD5D2D136" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/FairValueDisclosuresTables" 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_D9F3C6D402D95576ABFD19528F2004A3" 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_A0658D4880EC5EE2ADE03EE7DEC83C50" xlink:type="locator"/>
<link:presentationArc order="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_D9F3C6D402D95576ABFD19528F2004A3" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_A0658D4880EC5EE2ADE03EE7DEC83C50" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/GoodwillAndIntangibleAssets" 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_4BB878116BCC5818B7620682041973BF" 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_B90BBA48D1D65D988019C5925D1C1B13" xlink:type="locator"/>
<link:presentationArc order="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_4BB878116BCC5818B7620682041973BF" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_B90BBA48D1D65D988019C5925D1C1B13" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/GoodwillAndIntangibleAssetsCarryingAmountsOfAmortizableIntangibleAssetsDetails" 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_EDA61FC1EA9D5053BADFDD37AC2C5D12" 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_D18C1930272F5952986C70F00B470A21" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_EDA61FC1EA9D5053BADFDD37AC2C5D12" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D18C1930272F5952986C70F00B470A21" 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_E73A08776804521DBC172DA39082DDAA" xlink:type="locator"/>
<link:presentationArc order="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_D18C1930272F5952986C70F00B470A21" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E73A08776804521DBC172DA39082DDAA" 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_E93E78093BE85D0B86F6E91C865D8F99" xlink:type="locator"/>
<link:presentationArc order="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_E73A08776804521DBC172DA39082DDAA" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E93E78093BE85D0B86F6E91C865D8F99" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_2F9386F7A1635DBFB5F7EB4D4AD3EF6D" xlink:type="locator"/>
<link:presentationArc order="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_E93E78093BE85D0B86F6E91C865D8F99" xlink:to="loc_us-gaap_CustomerRelationshipsMember_2F9386F7A1635DBFB5F7EB4D4AD3EF6D" 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_F46A46C2ED365665963EA37A7650BA6F" 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_E93E78093BE85D0B86F6E91C865D8F99" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_F46A46C2ED365665963EA37A7650BA6F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MediaContentMember" xlink:label="loc_us-gaap_MediaContentMember_A14D5CCB4D185E978550C0580F581363" 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_E93E78093BE85D0B86F6E91C865D8F99" xlink:to="loc_us-gaap_MediaContentMember_A14D5CCB4D185E978550C0580F581363" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_2778BF3AE19659B482C96C0E9CD12CCB" 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_FiniteLivedIntangibleAssetsMajorClassNameDomain_E93E78093BE85D0B86F6E91C865D8F99" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_2778BF3AE19659B482C96C0E9CD12CCB" 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_31B1C0C1E6AD52F3B5E27DD9E29C9BB3" 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_D18C1930272F5952986C70F00B470A21" xlink:to="loc_srt_RangeAxis_31B1C0C1E6AD52F3B5E27DD9E29C9BB3" 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_DAE5DFFE20095BC59A09E4F9475D2248" xlink:type="locator"/>
<link: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_31B1C0C1E6AD52F3B5E27DD9E29C9BB3" xlink:to="loc_srt_RangeMember_DAE5DFFE20095BC59A09E4F9475D2248" 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_BC545718397B539493BCE0E1F66D3425" xlink:type="locator"/>
<link: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_DAE5DFFE20095BC59A09E4F9475D2248" xlink:to="loc_srt_MinimumMember_BC545718397B539493BCE0E1F66D3425" 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_385E2D14C1875C678AD84B145CF86CC3" 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_DAE5DFFE20095BC59A09E4F9475D2248" xlink:to="loc_srt_MaximumMember_385E2D14C1875C678AD84B145CF86CC3" 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_43B278983BD8586795A591835CCCBC7C" xlink:type="locator"/>
<link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D18C1930272F5952986C70F00B470A21" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_43B278983BD8586795A591835CCCBC7C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" xlink:type="locator"/>
<link:presentationArc order="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_43B278983BD8586795A591835CCCBC7C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" 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_6E77BFF485B654F095C6C5245404F1A1" 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_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_6E77BFF485B654F095C6C5245404F1A1" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_FiniteLivedIntangibleAssetsFullyAmortizedIntangibles" xlink:label="loc_it_FiniteLivedIntangibleAssetsFullyAmortizedIntangibles_9D771F87FFEF5AB1BAA43E65699630C4" 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_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" xlink:to="loc_it_FiniteLivedIntangibleAssetsFullyAmortizedIntangibles_9D771F87FFEF5AB1BAA43E65699630C4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_96459F7E6BD658838C2DD139BFCDF8D4" 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_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_96459F7E6BD658838C2DD139BFCDF8D4" 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_D50587034BF45825B28E16C5A41C60A1" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_D50587034BF45825B28E16C5A41C60A1" 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_B15DB0350DE651EBA9B44343705E914D" 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_FiniteLivedIntangibleAssetsLineItems_43B278983BD8586795A591835CCCBC7C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_B15DB0350DE651EBA9B44343705E914D" 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_3F9F6B4E32255EA8A8432BB63D11C512" 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_43B278983BD8586795A591835CCCBC7C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_3F9F6B4E32255EA8A8432BB63D11C512" 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_EF071BE52BAF5604A16ED619E86404DA" 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_43B278983BD8586795A591835CCCBC7C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_EF071BE52BAF5604A16ED619E86404DA" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_346AAD93C9B2556EB87D6EAB5828C1C8" 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_FiniteLivedIntangibleAssetsLineItems_43B278983BD8586795A591835CCCBC7C" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_346AAD93C9B2556EB87D6EAB5828C1C8" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/GoodwillAndIntangibleAssetsChangesToCarryingAmountOfGoodwillByReportingUnitDetails" 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_725C71677CCE5C30B1BBD2198E4C6EC1" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_C9412CC63A0C567FAA4DDF044E8A320F" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_725C71677CCE5C30B1BBD2198E4C6EC1" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_C9412CC63A0C567FAA4DDF044E8A320F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2EC72C856C4156DAA7345C24562B1687" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_C9412CC63A0C567FAA4DDF044E8A320F" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2EC72C856C4156DAA7345C24562B1687" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_30668D10F3EF5AAA8F9E8DC4F03EAC8D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2EC72C856C4156DAA7345C24562B1687" xlink:to="loc_us-gaap_SegmentDomain_30668D10F3EF5AAA8F9E8DC4F03EAC8D" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ResearchSegmentMember" xlink:label="loc_it_ResearchSegmentMember_4F9FEBE8762B5601A039DA8B638AF62C" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_30668D10F3EF5AAA8F9E8DC4F03EAC8D" xlink:to="loc_it_ResearchSegmentMember_4F9FEBE8762B5601A039DA8B638AF62C" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EventsMember" xlink:label="loc_it_EventsMember_6B2A11D590E25006A5BFA16E8AAC0CCC" 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_SegmentDomain_30668D10F3EF5AAA8F9E8DC4F03EAC8D" xlink:to="loc_it_EventsMember_6B2A11D590E25006A5BFA16E8AAC0CCC" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ConsultingMember" xlink:label="loc_it_ConsultingMember_8E7426B22F0A585E9D16C931EC444D88" 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_SegmentDomain_30668D10F3EF5AAA8F9E8DC4F03EAC8D" xlink:to="loc_it_ConsultingMember_8E7426B22F0A585E9D16C931EC444D88" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_C9412CC63A0C567FAA4DDF044E8A320F" xlink:to="loc_us-gaap_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_8AFE225B38965B48A3F9069359295233" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_8AFE225B38965B48A3F9069359295233" xlink:type="arc"/>
<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_0AF93F72C203580EBE12609487C0516F" 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_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:to="loc_us-gaap_GoodwillRollForward_0AF93F72C203580EBE12609487C0516F" 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_BA40B965D93D5E4BA50B09C7A74639E8" 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_0AF93F72C203580EBE12609487C0516F" xlink:to="loc_us-gaap_Goodwill_BA40B965D93D5E4BA50B09C7A74639E8" 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_E16345D3360E5602AC20F02993C21A9B" 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_0AF93F72C203580EBE12609487C0516F" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_E16345D3360E5602AC20F02993C21A9B" 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_0F015DBCD04159BB8D39BB9068A3411C" xlink:type="locator"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_0AF93F72C203580EBE12609487C0516F" xlink:to="loc_us-gaap_Goodwill_0F015DBCD04159BB8D39BB9068A3411C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_342DC818A7835DF5AC6232CBDD08FD0B" 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_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_342DC818A7835DF5AC6232CBDD08FD0B" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/GoodwillAndIntangibleAssetsEstimatedFutureAmortizationExpenseByYearFromAmortizableIntangiblesDetails" 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_BE4DBE3FDB8A48819A03B70D5B5E19DF" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:type="locator"/>
<link:presentationArc order="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_BE4DBE3FDB8A48819A03B70D5B5E19DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_CBCBB98F18880EFDD638B70D5B5E1AA3" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_CBCBB98F18880EFDD638B70D5B5E1AA3" 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_D7B9793BFA1D5FA5ADD0B70D5B5EA756" 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_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_D7B9793BFA1D5FA5ADD0B70D5B5EA756" 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_A87BB258482CC38C1C50B70D5B5E4671" 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_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_A87BB258482CC38C1C50B70D5B5E4671" 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_BADC55B5504358CD3921B70D5B5E94B3" 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_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_BADC55B5504358CD3921B70D5B5E94B3" 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_0042ED61EE4B2FF1AFB8B70D5B5EE485" 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_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_0042ED61EE4B2FF1AFB8B70D5B5EE485" 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_17F57BBE2DEE8FBB8948B70D5B5EA137" 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_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_17F57BBE2DEE8FBB8948B70D5B5EA137" 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_D9CB5CFE6275E553C76DB70D5B5E6359" 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_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_ABEEFAF40B7A8F18DDFFB70D5B5E1B2A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_D9CB5CFE6275E553C76DB70D5B5E6359" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/GoodwillAndIntangibleAssetsTables" 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_284FC73C374D58EABF7E8164DD8B1562" 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_47DB86B8CD54525C80B7AAB14093F400" xlink:type="locator"/>
<link:presentationArc order="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_284FC73C374D58EABF7E8164DD8B1562" xlink:to="loc_us-gaap_ScheduleOfGoodwillTextBlock_47DB86B8CD54525C80B7AAB14093F400" 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_1AF154C8CFCF57ADA6EE7A8DD6E8F313" 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_284FC73C374D58EABF7E8164DD8B1562" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_1AF154C8CFCF57ADA6EE7A8DD6E8F313" 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_20A6D1F65BF957AD9220B18297C9E15D" 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_284FC73C374D58EABF7E8164DD8B1562" xlink:to="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_20A6D1F65BF957AD9220B18297C9E15D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_212E551F6F805DB89D57A74E45DC02DE" 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_0B3022A0E96659E08DF7C5FA5722EC86" xlink:type="locator"/>
<link:presentationArc order="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_212E551F6F805DB89D57A74E45DC02DE" xlink:to="loc_us-gaap_IncomeTaxDisclosureTextBlock_0B3022A0E96659E08DF7C5FA5722EC86" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/IncomeTaxesDetails" 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_4233AEBF1F366AFC26A80418681256AA" xlink:type="locator"/>
<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_7DC7E1C42D93BC2EDEF104186813A492" 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_4233AEBF1F366AFC26A80418681256AA" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_7DC7E1C42D93BC2EDEF104186813A492" 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_04A01D997DD1FE7ADC7304186813227F" 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_4233AEBF1F366AFC26A80418681256AA" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_04A01D997DD1FE7ADC7304186813227F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization_102ACCB60410991D625A04186813FAB4" 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_IncomeTaxDisclosureAbstract_4233AEBF1F366AFC26A80418681256AA" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization_102ACCB60410991D625A04186813FAB4" 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_47D3D262C2C392AC5CB0041868145BC2" 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_4233AEBF1F366AFC26A80418681256AA" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_47D3D262C2C392AC5CB0041868145BC2" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_3C02154AFD9DEDB833450418681430A7" 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_4233AEBF1F366AFC26A80418681256AA" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_3C02154AFD9DEDB833450418681430A7" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_39E26522F70B5DBEB50B7BAB3ED4069E" 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_816583D6F0135A259111D6D54F900A6E" xlink:type="locator"/>
<link:presentationArc order="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_39E26522F70B5DBEB50B7BAB3ED4069E" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_816583D6F0135A259111D6D54F900A6E" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/SegmentInformationInformationAboutReportableSegmentsDetails" 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_41889FFA6183018C66B81D72FC013572" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_41889FFA6183018C66B81D72FC013572" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4772C231153108E831571D72FC0124DB" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4772C231153108E831571D72FC0124DB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_9FECC163FCB808D382661D72FC02BE98" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4772C231153108E831571D72FC0124DB" xlink:to="loc_us-gaap_SegmentDomain_9FECC163FCB808D382661D72FC02BE98" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ResearchSegmentMember" xlink:label="loc_it_ResearchSegmentMember_B69BC599CB6BDDA162261D72FC02E98A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_9FECC163FCB808D382661D72FC02BE98" xlink:to="loc_it_ResearchSegmentMember_B69BC599CB6BDDA162261D72FC02E98A" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EventsMember" xlink:label="loc_it_EventsMember_8C8D68B6E3EE13052D921D72FC0223FD" 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_SegmentDomain_9FECC163FCB808D382661D72FC02BE98" xlink:to="loc_it_EventsMember_8C8D68B6E3EE13052D921D72FC0223FD" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ConsultingMember" xlink:label="loc_it_ConsultingMember_A9A583C9402DD71BCAB41D72FC02AE6F" 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_SegmentDomain_9FECC163FCB808D382661D72FC02BE98" xlink:to="loc_it_ConsultingMember_A9A583C9402DD71BCAB41D72FC02AE6F" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_OtherRevenueMember" xlink:label="loc_it_OtherRevenueMember_8A94150BFA9FCE7889141D72FC023324" 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_SegmentDomain_9FECC163FCB808D382661D72FC02BE98" xlink:to="loc_it_OtherRevenueMember_8A94150BFA9FCE7889141D72FC023324" 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_DB4CFE6A72AE9C3FE0611D72FC031A52" 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_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C" xlink:to="loc_srt_ConsolidationItemsAxis_DB4CFE6A72AE9C3FE0611D72FC031A52" 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_C4C5E6279D61D64715C01D72FC03EDA0" xlink:type="locator"/>
<link: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_DB4CFE6A72AE9C3FE0611D72FC031A52" xlink:to="loc_srt_ConsolidationItemsDomain_C4C5E6279D61D64715C01D72FC03EDA0" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_6ED495825D8B74234C351D72FC0313DF" xlink:type="locator"/>
<link: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_C4C5E6279D61D64715C01D72FC03EDA0" xlink:to="loc_us-gaap_IntersegmentEliminationMember_6ED495825D8B74234C351D72FC0313DF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_43408C11BC92E9C0A26C1D72FC037D2C" 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_ConsolidationItemsDomain_C4C5E6279D61D64715C01D72FC03EDA0" xlink:to="loc_us-gaap_OperatingSegmentsMember_43408C11BC92E9C0A26C1D72FC037D2C" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_CorporateAndReconcilingItemsMember" xlink:label="loc_it_CorporateAndReconcilingItemsMember_FFA23A6B75C7B36943741D72FC04341A" 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_ConsolidationItemsDomain_C4C5E6279D61D64715C01D72FC03EDA0" xlink:to="loc_it_CorporateAndReconcilingItemsMember_FFA23A6B75C7B36943741D72FC04341A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B" xlink:type="locator"/>
<link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_43CE1B13EC16190D92721D72FC048C4A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B" xlink:to="loc_us-gaap_NumberOfOperatingSegments_43CE1B13EC16190D92721D72FC048C4A" 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_70B770AE88A14CB088821D72FC04690D" 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_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B" xlink:to="loc_us-gaap_Revenues_70B770AE88A14CB088821D72FC04690D" 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_85378AD85330C7D847941D72FC040C0F" 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_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B" xlink:to="loc_us-gaap_OperatingIncomeLoss_85378AD85330C7D847941D72FC040C0F" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/SegmentInformationReconciliationOfSegmentGrossContributionToNetIncomeDetails" 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_F9135ED5C2B38D71B84D16F5235C4737" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_20464BD9C8ED29794D9916F5235C7052" xlink:type="locator"/>
<link:presentationArc order="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_F9135ED5C2B38D71B84D16F5235C4737" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_20464BD9C8ED29794D9916F5235C7052" 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_F4226C32CDC6CE5751E416F5235D5345" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_20464BD9C8ED29794D9916F5235C7052" xlink:to="loc_srt_ConsolidationItemsAxis_F4226C32CDC6CE5751E416F5235D5345" 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_4D1613C6522E5CCA76B416F5235D7F51" xlink:type="locator"/>
<link: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_F4226C32CDC6CE5751E416F5235D5345" xlink:to="loc_srt_ConsolidationItemsDomain_4D1613C6522E5CCA76B416F5235D7F51" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_B74AEF16E528E044B8B516F5235D4F82" xlink:type="locator"/>
<link: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_4D1613C6522E5CCA76B416F5235D7F51" xlink:to="loc_us-gaap_OperatingSegmentsMember_B74AEF16E528E044B8B516F5235D4F82" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_CorporateAndReconcilingItemsMember" xlink:label="loc_it_CorporateAndReconcilingItemsMember_105BB7FC2AC3639E2A8F16F5235ED852" 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_ConsolidationItemsDomain_4D1613C6522E5CCA76B416F5235D7F51" xlink:to="loc_it_CorporateAndReconcilingItemsMember_105BB7FC2AC3639E2A8F16F5235ED852" 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_5F77EAA3A8CC4B6E846316F5235EC6F8" 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_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_20464BD9C8ED29794D9916F5235C7052" xlink:to="loc_srt_RangeAxis_5F77EAA3A8CC4B6E846316F5235EC6F8" 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_86D99246A36B32FCD44B16F5235EF566" xlink:type="locator"/>
<link: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_5F77EAA3A8CC4B6E846316F5235EC6F8" xlink:to="loc_srt_RangeMember_86D99246A36B32FCD44B16F5235EF566" 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_06D9388727419FA94E7916F5235EE183" xlink:type="locator"/>
<link: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_86D99246A36B32FCD44B16F5235EF566" xlink:to="loc_srt_MaximumMember_06D9388727419FA94E7916F5235EE183" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" 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_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_20464BD9C8ED29794D9916F5235C7052" xlink:to="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" 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_C1F3B6EC654B5D760B9116F5235F1387" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_C1F3B6EC654B5D760B9116F5235F1387" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_90F927D0899B6623130D16F5235FDBE5" xlink:type="locator"/>
<link:presentationArc order="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_C1F3B6EC654B5D760B9116F5235F1387" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_90F927D0899B6623130D16F5235FDBE5" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_C0D1663BCF513584882C16F523600A5B" 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_C1F3B6EC654B5D760B9116F5235F1387" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_C0D1663BCF513584882C16F523600A5B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA" 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_C1F3B6EC654B5D760B9116F5235F1387" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BusinessCombinationAcquisitionandIntegrationRelatedCosts" xlink:label="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6" 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_CostsAndExpensesAbstract_C1F3B6EC654B5D760B9116F5235F1387" xlink:to="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6" 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_859503073FA414C1C5A216F523607362" 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_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_us-gaap_OperatingIncomeLoss_859503073FA414C1C5A216F523607362" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_InterestExpenseandOtherNonoperatingIncome" xlink:label="loc_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E" 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_DEDDEEDF584F4AF3C22216F9C7526B81" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_DEDDEEDF584F4AF3C22216F9C7526B81" 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_8B7CEE1509EBBD1CA7CA16F52366AAC4" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_8B7CEE1509EBBD1CA7CA16F52366AAC4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_3FABA952CFDDFE52887216F523665835" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_us-gaap_NetIncomeLoss_3FABA952CFDDFE52887216F523665835" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments" xlink:label="loc_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_6191B9594F8F2A14301216F5235F348C" xlink:to="loc_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.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_D92EFB9F1EFF57EDBF224FDBEB5ADC56" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_4A52C330A6F75ED9A58A4B2E0DD54F8A" xlink:type="locator"/>
<link:presentationArc order="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_D92EFB9F1EFF57EDBF224FDBEB5ADC56" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_4A52C330A6F75ED9A58A4B2E0DD54F8A" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_6A68DCC1D29059B2A6F7AF28D0A9905D" 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_D92EFB9F1EFF57EDBF224FDBEB5ADC56" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_6A68DCC1D29059B2A6F7AF28D0A9905D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensation" 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_BC4812993781560681D8A0917EC40806" 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_5D2E678CFA035B169DF1AD95A26538E7" xlink:type="locator"/>
<link:presentationArc order="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_BC4812993781560681D8A0917EC40806" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_5D2E678CFA035B169DF1AD95A26538E7" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationAdditionalInformationDetails" 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_21B726CE3D655FB38B554C8861D354FE" 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_C727582F86675F85A9E7E65C6F3C5833" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_21B726CE3D655FB38B554C8861D354FE" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C727582F86675F85A9E7E65C6F3C5833" 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_A4208A2839F45A2984D391BD6EA92889" xlink:type="locator"/>
<link:presentationArc order="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_C727582F86675F85A9E7E65C6F3C5833" xlink:to="loc_us-gaap_PlanNameAxis_A4208A2839F45A2984D391BD6EA92889" 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_B2C3526AC15557048D43311086CB1405" xlink:type="locator"/>
<link:presentationArc order="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_A4208A2839F45A2984D391BD6EA92889" xlink:to="loc_us-gaap_PlanNameDomain_B2C3526AC15557048D43311086CB1405" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EmployeeStockPurchasePlanMember" xlink:label="loc_it_EmployeeStockPurchasePlanMember_58357B677E3F563DAACBEB09F85BEEB9" xlink:type="locator"/>
<link:presentationArc order="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_B2C3526AC15557048D43311086CB1405" xlink:to="loc_it_EmployeeStockPurchasePlanMember_58357B677E3F563DAACBEB09F85BEEB9" 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_8828B9FF38E45099BEC88A25F4B0284B" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C727582F86675F85A9E7E65C6F3C5833" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8828B9FF38E45099BEC88A25F4B0284B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_6812355FB22E5621B16A05A8E4C72DF8" xlink:type="locator"/>
<link:presentationArc order="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_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_6812355FB22E5621B16A05A8E4C72DF8" xlink:type="arc"/>
<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_22DD6FE1DF405336A058898171C4007E" 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_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_22DD6FE1DF405336A058898171C4007E" 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_D70D0185D4EF5F3CBD0745A2096F696A" 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_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_D70D0185D4EF5F3CBD0745A2096F696A" 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_C3527BC1911C5F7199B6C5FE2B3A3940" 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_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_C3527BC1911C5F7199B6C5FE2B3A3940" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByEmployeeStockPurchasePlanStockPurchasesAsPercentageOfEmployeeCompensationMaximum" xlink:label="loc_it_ShareBasedCompensationArrangementByEmployeeStockPurchasePlanStockPurchasesAsPercentageOfEmployeeCompensationMaximum_3FBD1004B2D6515CBAA189BC9FC726DA" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_it_ShareBasedCompensationArrangementByEmployeeStockPurchasePlanStockPurchasesAsPercentageOfEmployeeCompensationMaximum_3FBD1004B2D6515CBAA189BC9FC726DA" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumShareValueAuthorizedForPurchaseUnderEmployeeStockPurchasePlan" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumShareValueAuthorizedForPurchaseUnderEmployeeStockPurchasePlan_5C00C5D038775B638A6317B8CAC49F2A" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumShareValueAuthorizedForPurchaseUnderEmployeeStockPurchasePlan_5C00C5D038775B638A6317B8CAC49F2A" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisablePricePercentageOfClosingPriceOfAnotherClassOfStock" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisablePricePercentageOfClosingPriceOfAnotherClassOfStock_DBF0C8739CBC5D9785ED11A6B131E31A" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisablePricePercentageOfClosingPriceOfAnotherClassOfStock_DBF0C8739CBC5D9785ED11A6B131E31A" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants" xlink:label="loc_it_EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants_F5E64D9D73725E32A4852281BEE34430" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_it_EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants_F5E64D9D73725E32A4852281BEE34430" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromStockPlans" xlink:label="loc_us-gaap_ProceedsFromStockPlans_19AA1F5124DC5A23BB474654011D8387" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8828B9FF38E45099BEC88A25F4B0284B" xlink:to="loc_us-gaap_ProceedsFromStockPlans_19AA1F5124DC5A23BB474654011D8387" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationStockBasedCompensationExpenseByAwardTypeAndExpenseCategoryDetails" 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_0BF89A88134734EBBB6604186AA26120" 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_4F5BB764C207E6137B8604186AA2FF60" xlink:type="locator"/>
<link:presentationArc order="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_0BF89A88134734EBBB6604186AA26120" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F5BB764C207E6137B8604186AA2FF60" 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_4606C405ED73B7925B8A04186AA3B261" xlink:type="locator"/>
<link:presentationArc order="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_4F5BB764C207E6137B8604186AA2FF60" xlink:to="loc_us-gaap_AwardTypeAxis_4606C405ED73B7925B8A04186AA3B261" 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_82856DE522EC9143D16904186AA3CF6E" xlink:type="locator"/>
<link:presentationArc order="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_4606C405ED73B7925B8A04186AA3B261" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" xlink:type="locator"/>
<link:presentationArc order="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_82856DE522EC9143D16904186AA3CF6E" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" 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_04C8D7E897C7E98CC3A904186AA4DEA8" 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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_CommonStockEquivalentsMember" xlink:label="loc_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" 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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:to="loc_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_RetirementEligibleEmployeesEquityAwardMember" xlink:label="loc_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" 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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:to="loc_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" 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_C4514BF2905130A38B0904186AA481F8" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F5BB764C207E6137B8604186AA2FF60" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" 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_CED72D3C3AAF3E65DFFA04186AA50806" 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_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:type="locator"/>
<link:presentationArc order="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_CED72D3C3AAF3E65DFFA04186AA50806" xlink:to="loc_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" 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_CED72D3C3AAF3E65DFFA04186AA50806" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquisitionRelatedCostsMember" xlink:label="loc_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" 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_CED72D3C3AAF3E65DFFA04186AA50806" xlink:to="loc_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" 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_C8576C0903DD24BBF28604186AAD19E4" 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_4F5BB764C207E6137B8604186AA2FF60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4" 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_FE7BC71CB25C6701567C04186AAD1428" xlink:type="locator"/>
<link:presentationArc order="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_C8576C0903DD24BBF28604186AAD19E4" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationSummaryOfChangesInCsesOutstandingDetails" 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_4E256C0FB4471863F9FCD0AE1B58E3AB" 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_2BB263152D8906B5A1FED0AE1B58C859" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_4E256C0FB4471863F9FCD0AE1B58E3AB" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2BB263152D8906B5A1FED0AE1B58C859" 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_0CD2869472CA14FE0598D0AE1B5E9839" xlink:type="locator"/>
<link:presentationArc order="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_2BB263152D8906B5A1FED0AE1B58C859" xlink:to="loc_us-gaap_AwardTypeAxis_0CD2869472CA14FE0598D0AE1B5E9839" 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_20A2FB27BEFF0B45D9CFD0AE1B5E8F47" xlink:type="locator"/>
<link:presentationArc order="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_0CD2869472CA14FE0598D0AE1B5E9839" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_20A2FB27BEFF0B45D9CFD0AE1B5E8F47" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_CommonStockEquivalentsMember" xlink:label="loc_it_CommonStockEquivalentsMember_6B3AC5CFE62F7C23305FD0AE1B5E27F9" xlink:type="locator"/>
<link:presentationArc order="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_20A2FB27BEFF0B45D9CFD0AE1B5E8F47" xlink:to="loc_it_CommonStockEquivalentsMember_6B3AC5CFE62F7C23305FD0AE1B5E27F9" 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_A6C6945545FC693ED624D0AE1B5F6BDB" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2BB263152D8906B5A1FED0AE1B58C859" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A6C6945545FC693ED624D0AE1B5F6BDB" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationRightToReceiveShare" xlink:label="loc_it_ShareBasedCompensationRightToReceiveShare_01B642C1BE89BF0D20CFD0AE1B5FA124" xlink:type="locator"/>
<link:presentationArc order="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_A6C6945545FC693ED624D0AE1B5F6BDB" xlink:to="loc_it_ShareBasedCompensationRightToReceiveShare_01B642C1BE89BF0D20CFD0AE1B5FA124" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_BaseFeePercentage" xlink:label="loc_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" 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_A6C6945545FC693ED624D0AE1B5F6BDB" xlink:to="loc_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" 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_4072EEFA84BEEED98D30D0AE1B5FBF51" 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_A6C6945545FC693ED624D0AE1B5F6BDB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" 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_6F98A29F7ECD360D8E8AD0AE1B5F2A1D" 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_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6F98A29F7ECD360D8E8AD0AE1B5F2A1D" 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_7EF146A56DE815EC6AE2D0AE1B6068AF" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_7EF146A56DE815EC6AE2D0AE1B6068AF" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" 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_231A57DD21E38FBCB1B5D0AE1B60856E" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_231A57DD21E38FBCB1B5D0AE1B60856E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_010F6ECB23825F435BC9D0AE1B600C0B" 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_A6C6945545FC693ED624D0AE1B5F6BDB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_010F6ECB23825F435BC9D0AE1B600C0B" 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_7728BA8FDCCD15A3AEF4D0AE1B607646" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_010F6ECB23825F435BC9D0AE1B600C0B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7728BA8FDCCD15A3AEF4D0AE1B607646" 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_2FEACB43D529CC655FF0D0AE1B61C3C2" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_010F6ECB23825F435BC9D0AE1B600C0B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FEACB43D529CC655FF0D0AE1B61C3C2" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_010F6ECB23825F435BC9D0AE1B600C0B" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" 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_9E4C15A00CF2D3972903D0AE1B61B466" xlink:type="locator"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_010F6ECB23825F435BC9D0AE1B600C0B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9E4C15A00CF2D3972903D0AE1B61B466" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationSummaryOfChangesInRsusOutstandingDetails" 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_36BA4E350EEE46886886461C881B9FB4" 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_828675413A3C337FA4E1461C881B6158" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_36BA4E350EEE46886886461C881B9FB4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_828675413A3C337FA4E1461C881B6158" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_E445F1EB419451B10B31461C881C4586" xlink:type="locator"/>
<link:presentationArc order="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_828675413A3C337FA4E1461C881B6158" xlink:to="loc_srt_StatementScenarioAxis_E445F1EB419451B10B31461C881C4586" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:type="locator"/>
<link: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_StatementScenarioAxis_E445F1EB419451B10B31461C881C4586" xlink:to="loc_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioForecastMember" xlink:label="loc_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" xlink:type="locator"/>
<link: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_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:to="loc_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" 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_6E075AFD12A93A55B67A461C881C7738" 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_828675413A3C337FA4E1461C881B6158" xlink:to="loc_us-gaap_AwardTypeAxis_6E075AFD12A93A55B67A461C881C7738" 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_33BF43E07BECF25249CE461C881CE6E7" xlink:type="locator"/>
<link:presentationArc order="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_6E075AFD12A93A55B67A461C881C7738" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_33BF43E07BECF25249CE461C881CE6E7" 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_55A9C7504AF3C79BA3C1461C881D3A9E" xlink:type="locator"/>
<link:presentationArc order="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_33BF43E07BECF25249CE461C881CE6E7" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_55A9C7504AF3C79BA3C1461C881D3A9E" 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_85B29CBE19B49566D634461C881DF20E" 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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_33BF43E07BECF25249CE461C881CE6E7" xlink:to="loc_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" 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_828675413A3C337FA4E1461C881B6158" xlink:to="loc_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:type="locator"/>
<link: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_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ExecutiveOfficerMember" xlink:label="loc_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:type="locator"/>
<link: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_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:to="loc_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_NonExecutiveMember" xlink:label="loc_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" 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_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:to="loc_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" 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_120CAB23532673C0CAAB461C881E0DAE" 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_828675413A3C337FA4E1461C881B6158" xlink:to="loc_srt_RangeAxis_120CAB23532673C0CAAB461C881E0DAE" 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_711BF200FAD078343471461C881E888A" xlink:type="locator"/>
<link: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_120CAB23532673C0CAAB461C881E0DAE" xlink:to="loc_srt_RangeMember_711BF200FAD078343471461C881E888A" 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_8702171A547FCB5AABF2461C881EC41C" xlink:type="locator"/>
<link: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_711BF200FAD078343471461C881E888A" xlink:to="loc_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C" 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_70BC93B919EFED4986C1461C881FBDB3" 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_711BF200FAD078343471461C881E888A" xlink:to="loc_srt_MaximumMember_70BC93B919EFED4986C1461C881FBDB3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_828675413A3C337FA4E1461C881B6158" xlink:to="loc_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:to="loc_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_TargetAmountMember" xlink:label="loc_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:to="loc_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" 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_9DFF3ADA4DC230EB9FFA461C88209351" xlink:type="locator"/>
<link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_828675413A3C337FA4E1461C881B6158" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFF3ADA4DC230EB9FFA461C88209351" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationRightToReceiveShare" xlink:label="loc_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:type="locator"/>
<link:presentationArc order="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_9DFF3ADA4DC230EB9FFA461C88209351" xlink:to="loc_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" 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_5B5ED15A494DB4AF04CE461C882063A8" 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_9DFF3ADA4DC230EB9FFA461C88209351" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8" 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_75F8BC54070D21AECE80461C8820FE58" 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_9DFF3ADA4DC230EB9FFA461C88209351" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" 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_ABAD3EC2822AEE054FA6461C882079FC" 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_75F8BC54070D21AECE80461C8820FE58" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ABAD3EC2822AEE054FA6461C882079FC" 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_4E2C8441424144EB0AC0461C88219C06" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4E2C8441424144EB0AC0461C88219C06" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndReleasedInPeriod" xlink:label="loc_it_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndReleasedInPeriod_D3A9D7075B453AEF174A461C8821BE3A" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:to="loc_it_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndReleasedInPeriod_D3A9D7075B453AEF174A461C8821BE3A" 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_CE67833879F49A2D2024461C88218CF6" 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_75F8BC54070D21AECE80461C8820FE58" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_CE67833879F49A2D2024461C88218CF6" 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_547DFE0DE3A22685D44F461C88219937" 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_75F8BC54070D21AECE80461C8820FE58" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_547DFE0DE3A22685D44F461C88219937" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" 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_9DFF3ADA4DC230EB9FFA461C88209351" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" 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_A1152EB4E4CE9579EDA2461C88223F29" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_A1152EB4E4CE9579EDA2461C88223F29" 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_306C0CA0983CAA310C68461C88224BD5" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_306C0CA0983CAA310C68461C88224BD5" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndReleasedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_it_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndReleasedInPeriodWeightedAverageGrantDateFairValue_EF8CB8FE1B911E03BFF3461C8822BCF9" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" xlink:to="loc_it_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndReleasedInPeriodWeightedAverageGrantDateFairValue_EF8CB8FE1B911E03BFF3461C8822BCF9" 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_CDB971C8A45A8098A256461C88224AAD" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_CDB971C8A45A8098A256461C88224AAD" 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_39E7725BFDB78A93E142461C8822248F" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_A8976BAA888481A42FC1461C8821C854" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_39E7725BFDB78A93E142461C8822248F" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardPercentageofSharesAuthorizedforGrant" xlink:label="loc_it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardPercentageofSharesAuthorizedforGrant_B666A90B58B115A18661461C8822C4A3" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFF3ADA4DC230EB9FFA461C88209351" xlink:to="loc_it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardPercentageofSharesAuthorizedforGrant_B666A90B58B115A18661461C8822C4A3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_DBB29C54DD785B5C3D0B461C8823CC65" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFF3ADA4DC230EB9FFA461C88209351" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_DBB29C54DD785B5C3D0B461C8823CC65" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationSummaryOfChangesInSarsOutstandingDetails" 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_F3E43538036FD28A384492C01FA0C96C" 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_D10088AF7CC42517716E92C01FA177C0" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_F3E43538036FD28A384492C01FA0C96C" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D10088AF7CC42517716E92C01FA177C0" 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_AF386918927DF96BD71A92C01FA18001" xlink:type="locator"/>
<link:presentationArc order="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_D10088AF7CC42517716E92C01FA177C0" xlink:to="loc_us-gaap_PlanNameAxis_AF386918927DF96BD71A92C01FA18001" 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_DD56FA60A6763370DA1D92C01FA18E6E" xlink:type="locator"/>
<link:presentationArc order="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_AF386918927DF96BD71A92C01FA18001" xlink:to="loc_us-gaap_PlanNameDomain_DD56FA60A6763370DA1D92C01FA18E6E" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_UnvestedMember" xlink:label="loc_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F" xlink:type="locator"/>
<link:presentationArc order="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_DD56FA60A6763370DA1D92C01FA18E6E" xlink:to="loc_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F" 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_145CF2AAAFEF5D04831792C01FA20E81" 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_D10088AF7CC42517716E92C01FA177C0" xlink:to="loc_us-gaap_AwardTypeAxis_145CF2AAAFEF5D04831792C01FA20E81" 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_739AC012794221BEA5A192C01FA2AF43" xlink:type="locator"/>
<link:presentationArc order="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_145CF2AAAFEF5D04831792C01FA20E81" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_739AC012794221BEA5A192C01FA2AF43" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_F8E113799D38E372652B92C01FA27ACC" xlink:type="locator"/>
<link:presentationArc order="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_739AC012794221BEA5A192C01FA2AF43" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_F8E113799D38E372652B92C01FA27ACC" 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_77427474D4B1207286D592C01FA2AC84" xlink:type="locator"/>
<link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D10088AF7CC42517716E92C01FA177C0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" 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_16EA05D09463854A749C92D0D911EDAD" xlink:type="locator"/>
<link:presentationArc order="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_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_16EA05D09463854A749C92D0D911EDAD" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant_151A779B51018EEFB46D92C01FA35B1D" 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_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant_151A779B51018EEFB46D92C01FA35B1D" 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_5E78B122420D5D78B7A892C01FA32805" 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_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5E78B122420D5D78B7A892C01FA32805" 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_7ED0D55B20A577ACFD4192C01FA34513" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7ED0D55B20A577ACFD4192C01FA34513" 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_6183E09636735909382C92C01FA3A52B" 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_7ED0D55B20A577ACFD4192C01FA34513" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6183E09636735909382C92C01FA3A52B" 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_5893BF3579031410587692C01FA3AB1C" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7ED0D55B20A577ACFD4192C01FA34513" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5893BF3579031410587692C01FA3AB1C" 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_C27459AA0EC92DB72DEC92C01FA42D7C" 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_7ED0D55B20A577ACFD4192C01FA34513" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_C27459AA0EC92DB72DEC92C01FA42D7C" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8" 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_7ED0D55B20A577ACFD4192C01FA34513" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8" 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_E1418B1ABD2FFA9DAE8892C01FA44709" 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_7ED0D55B20A577ACFD4192C01FA34513" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_E1418B1ABD2FFA9DAE8892C01FA44709" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber" xlink:label="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764" 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_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice_FECB55E5E290C9334BEA92C01FA525CB" 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_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice_FECB55E5E290C9334BEA92C01FA525CB" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementsbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresinPeriodWeightedAverageExercisePrice" xlink:label="loc_it_SharebasedCompensationArrangementsbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresinPeriodWeightedAverageExercisePrice_275E933A9266DE909BF992C01FA56C14" 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_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:to="loc_it_SharebasedCompensationArrangementsbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresinPeriodWeightedAverageExercisePrice_275E933A9266DE909BF992C01FA56C14" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice_B9A86500721ACD43AF7092C01FA56829" 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_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice_B9A86500721ACD43AF7092C01FA56829" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_6064DF6F6E57349BA56792C01FA54691" 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_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_6064DF6F6E57349BA56792C01FA54691" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice." xlink:label="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice._601FA8AA2684C73CBED192C01FA5C27C" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice._601FA8AA2684C73CBED192C01FA5C27C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" 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_EC9E4B7753A4981A097F92C01FA646E9" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_EC9E4B7753A4981A097F92C01FA646E9" 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_E3F20CEA098355EFE07A92C01FA6F94D" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E3F20CEA098355EFE07A92C01FA6F94D" 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_AB78B576899CBBC8B27A92C01FA626D3" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_AB78B576899CBBC8B27A92C01FA626D3" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue_CD6C2AF180C9F8DFB89692C01FA61AFB" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue_CD6C2AF180C9F8DFB89692C01FA61AFB" 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_991815F9011108EF7FBB92C01FA6F152" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_D1D8DCA6526B72F667BC92C01FA5FCD6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_991815F9011108EF7FBB92C01FA6F152" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue." xlink:label="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue._D45D513165844F358E5792C01FA63F38" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue._D45D513165844F358E5792C01FA63F38" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageRemainingContractualTermAbstract" xlink:label="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageRemainingContractualTermAbstract_BA43D97214929F2D455492C01FA7FDD3" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageRemainingContractualTermAbstract_BA43D97214929F2D455492C01FA7FDD3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_56A5C051A760B900538692C01FA74997" 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_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageRemainingContractualTermAbstract_BA43D97214929F2D455492C01FA7FDD3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_56A5C051A760B900538692C01FA74997" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodWeightedAverageRemainingContractualTerm" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodWeightedAverageRemainingContractualTerm_D4C37EFB5D7648CEDD6292C01FA793CA" 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_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageRemainingContractualTermAbstract_BA43D97214929F2D455492C01FA7FDD3" xlink:to="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodWeightedAverageRemainingContractualTerm_D4C37EFB5D7648CEDD6292C01FA793CA" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm." xlink:label="loc_it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm._629EC58FB618AEAC6E3892C01FA7520D" 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_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageRemainingContractualTermAbstract_BA43D97214929F2D455492C01FA7FDD3" xlink:to="loc_it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm._629EC58FB618AEAC6E3892C01FA7520D" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue." xlink:label="loc_it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue._AED3C11FCD78D4269D6F92C01FA7C957" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue._AED3C11FCD78D4269D6F92C01FA7C957" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue." xlink:label="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_77427474D4B1207286D592C01FA2AC84" xlink:to="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationTables" 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_A54370B8DC82049F4FD28E6204ECC326" 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_41332B67C9560E4D29148E6204EC7515" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_A54370B8DC82049F4FD28E6204ECC326" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_41332B67C9560E4D29148E6204EC7515" 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_0E123A0C03A4CAF664E38E6204EC6A2A" xlink:type="locator"/>
<link:presentationArc order="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_41332B67C9560E4D29148E6204EC7515" xlink:to="loc_us-gaap_AwardTypeAxis_0E123A0C03A4CAF664E38E6204EC6A2A" 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_A11D81B1578A8499D0018E6204ECDA06" xlink:type="locator"/>
<link:presentationArc order="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_0E123A0C03A4CAF664E38E6204EC6A2A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A11D81B1578A8499D0018E6204ECDA06" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_41925C3BFA6C592A3A5A8E6204ED65DC" xlink:type="locator"/>
<link:presentationArc order="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_A11D81B1578A8499D0018E6204ECDA06" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_41925C3BFA6C592A3A5A8E6204ED65DC" 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_5F140FC937195783A1198E6204ED3D0B" 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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A11D81B1578A8499D0018E6204ECDA06" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_5F140FC937195783A1198E6204ED3D0B" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_CommonStockEquivalentsMember" xlink:label="loc_it_CommonStockEquivalentsMember_695697EE01EA0E9EBC9C8E6204ED96E8" 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_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A11D81B1578A8499D0018E6204ECDA06" xlink:to="loc_it_CommonStockEquivalentsMember_695697EE01EA0E9EBC9C8E6204ED96E8" 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_6BF370E934B77760606C8E6204ED7BD3" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_41332B67C9560E4D29148E6204EC7515" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6BF370E934B77760606C8E6204ED7BD3" xlink:type="arc"/>
<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_C55D8B9DD8168CEFA4838E6204ED5ADB" xlink:type="locator"/>
<link:presentationArc order="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_6BF370E934B77760606C8E6204ED7BD3" xlink:to="loc_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_C55D8B9DD8168CEFA4838E6204ED5ADB" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_B03B8812944E7309E1BB8E6204EED1F3" 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_6BF370E934B77760606C8E6204ED7BD3" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_B03B8812944E7309E1BB8E6204EED1F3" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:label="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_EED72A5949A213A1D88C8E6204EE566B" 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_6BF370E934B77760606C8E6204ED7BD3" xlink:to="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_EED72A5949A213A1D88C8E6204EE566B" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock_C0B6A4D3284C8CA5BC5F8E6204EEC4C9" 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_6BF370E934B77760606C8E6204ED7BD3" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock_C0B6A4D3284C8CA5BC5F8E6204EEC4C9" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/StockBasedCompensationWeightedAverageAssumptionsUsedToDetermineFairValueOfSarsGrantsOnDateOfGrantUsingBlackScholesDetails" 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_22EB1ECCBC605A5DB3E9F6AFCFA36064" 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_37810C57F2FC51329E5A05A8EC21D0AF" xlink:type="locator"/>
<link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_22EB1ECCBC605A5DB3E9F6AFCFA36064" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37810C57F2FC51329E5A05A8EC21D0AF" 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_C26C1DBD5E8951AFA966B79016816A1D" xlink:type="locator"/>
<link:presentationArc order="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_37810C57F2FC51329E5A05A8EC21D0AF" xlink:to="loc_us-gaap_AwardTypeAxis_C26C1DBD5E8951AFA966B79016816A1D" 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_C212EE9946A256FCADA73B1F11AEB62C" xlink:type="locator"/>
<link:presentationArc order="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_C26C1DBD5E8951AFA966B79016816A1D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C212EE9946A256FCADA73B1F11AEB62C" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_2D571A07953055DA854A44F0E5DE271D" xlink:type="locator"/>
<link:presentationArc order="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_C212EE9946A256FCADA73B1F11AEB62C" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_2D571A07953055DA854A44F0E5DE271D" 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_7F9CEB1166A4576EB9FACED0B2EC8202" xlink:type="locator"/>
<link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37810C57F2FC51329E5A05A8EC21D0AF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7F9CEB1166A4576EB9FACED0B2EC8202" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1E7C74A829A757C99B83BCC3FB5044BF" xlink:type="locator"/>
<link:presentationArc order="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_7F9CEB1166A4576EB9FACED0B2EC8202" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1E7C74A829A757C99B83BCC3FB5044BF" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_004CE572ED1D583E81AC107F9522E79F" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1E7C74A829A757C99B83BCC3FB5044BF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_004CE572ED1D583E81AC107F9522E79F" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_8B795B47312A55359130303AB065A191" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1E7C74A829A757C99B83BCC3FB5044BF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_8B795B47312A55359130303AB065A191" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_D5F00EA96D4D5522A0049874A89F63F6" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1E7C74A829A757C99B83BCC3FB5044BF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_D5F00EA96D4D5522A0049874A89F63F6" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_748134E32DF8543E8A6A940E50C3A21D" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1E7C74A829A757C99B83BCC3FB5044BF" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_748134E32DF8543E8A6A940E50C3A21D" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/SubsequentEvent" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaap_SubsequentEventsAbstract_8F5EDD5DF4F5D4FA7EABB2D0743DEA80" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="loc_us-gaap_SubsequentEventsTextBlock_8FEE8AF3EFF0294118E4B2D0743DDC89" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventsAbstract_8F5EDD5DF4F5D4FA7EABB2D0743DEA80" xlink:to="loc_us-gaap_SubsequentEventsTextBlock_8FEE8AF3EFF0294118E4B2D0743DDC89" xlink:type="arc"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.gartner.com/role/SubsequentEventsDetails" xlink:type="extended">
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaap_SubsequentEventsAbstract_10B90C540696BD1437B216F521D944AA" xlink:type="locator"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="loc_us-gaap_SubsequentEventTable_4184A3E0EB95A49EE21B16F521DE807B" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventsAbstract_10B90C540696BD1437B216F521D944AA" xlink:to="loc_us-gaap_SubsequentEventTable_4184A3E0EB95A49EE21B16F521DE807B" 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_2C5BE3AE085584A01CC316F521E0077A" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTable_4184A3E0EB95A49EE21B16F521DE807B" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_2C5BE3AE085584A01CC316F521E0077A" 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_E879F265F09430FB817716F521E10F2F" xlink:type="locator"/>
<link:presentationArc order="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_2C5BE3AE085584A01CC316F521E0077A" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E879F265F09430FB817716F521E10F2F" xlink:type="arc"/>
<link:loc xlink:href="it-20190930.xsd#it_TOPOResearchLLCMember" xlink:label="loc_it_TOPOResearchLLCMember_29934E37191852877D9B16F521E1B185" xlink:type="locator"/>
<link:presentationArc order="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_E879F265F09430FB817716F521E10F2F" xlink:to="loc_it_TOPOResearchLLCMember_29934E37191852877D9B16F521E1B185" 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_02EFBBF9AF667ADCA3FF16F521E2CDE8" 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_SubsequentEventTable_4184A3E0EB95A49EE21B16F521DE807B" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_02EFBBF9AF667ADCA3FF16F521E2CDE8" 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_318788F0324DE4D037B816F521E2488D" xlink:type="locator"/>
<link:presentationArc order="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_02EFBBF9AF667ADCA3FF16F521E2CDE8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_318788F0324DE4D037B816F521E2488D" 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_0B235BE9713BCFA2F77F16F521E39889" xlink:type="locator"/>
<link:presentationArc order="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_318788F0324DE4D037B816F521E2488D" xlink:to="loc_us-gaap_SubsequentEventMember_0B235BE9713BCFA2F77F16F521E39889" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_0F391024110F7358B7FD16F521E3FAD4" 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_SubsequentEventTable_4184A3E0EB95A49EE21B16F521DE807B" xlink:to="loc_us-gaap_SubsequentEventLineItems_0F391024110F7358B7FD16F521E3FAD4" xlink:type="arc"/>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_205C2ED8B13CA32F378A16F521E3461D" xlink:type="locator"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_0F391024110F7358B7FD16F521E3FAD4" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_205C2ED8B13CA32F378A16F521E3461D" 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_2DBC148F39B40FBA983416F521E4C05A" 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_SubsequentEventLineItems_0F391024110F7358B7FD16F521E3FAD4" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_2DBC148F39B40FBA983416F521E4C05A" xlink:type="arc"/>
</link:presentationLink>
</link:linkbase>

Top
Filing Submission 0000749251-19-000025   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
AboutPrivacyRedactionsHelp — Sun., May 5, 10:23:20.2pm ET