SEC Info - GrafTech International Ltd. - ‘10-K’ for 12/31/22

SEC Info℠

Home

My Interests

Help

Please Sign In

GrafTech International Ltd. – ‘10-K’ for 12/31/22 – ‘EX-101.DEF’

On: Tuesday, 2/14/23, at 4:12pm ET · For: 12/31/22 · Accession #: 931148-23-35 · File #: 1-13888

Previous ‘10-K’: ‘10-K’ on 2/22/22 for 12/31/21 · Next & Latest: ‘10-K’ on 2/14/24 for 12/31/23 · 16 References:

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

 2/14/23  GrafTech International Ltd.       10-K       12/31/22  144:14M

Annual Report — Form 10-K

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   2.83M 
 2: EX-10.15    Material Contract                                   HTML    264K 
 3: EX-10.38    Material Contract                                   HTML     61K 
 4: EX-10.39    Material Contract                                   HTML     68K 
 5: EX-10.40    Material Contract                                   HTML     68K 
 6: EX-10.41    Material Contract                                   HTML     59K 
 7: EX-10.42    Material Contract                                   HTML     54K 
 8: EX-21.1     Subsidiaries List                                   HTML     45K 
 9: EX-23.1     Consent of Expert or Counsel                        HTML     38K 
10: EX-31.1     Certification -- §302 - SOA'02                      HTML     43K 
11: EX-31.2     Certification -- §302 - SOA'02                      HTML     43K 
12: EX-32.1     Certification -- §906 - SOA'02                      HTML     41K 
13: EX-32.2     Certification -- §906 - SOA'02                      HTML     41K 
19: R1          Cover                                               HTML    102K 
20: R2          Audit Information                                   HTML     44K 
21: R3          Consolidated Balance Sheets                         HTML    148K 
22: R4          Consolidated Balance Sheets (Parenthetical)         HTML     57K 
23: R5          Consolidated Statements Of Operations And           HTML    131K 
                Comprehensive Income                                             
24: R6          Consolidated Statements Of Operations And           HTML     44K 
                Comprehensive Income (Parenthetical)                             
25: R7          Consolidated Statements Of Cash Flows               HTML    141K 
26: R8          Consolidated Statements Of Stockholders' Equity     HTML    144K 
27: R9          Consolidated Statements Of Stockholders' Equity     HTML     50K 
                (Parenthetical)                                                  
28: R10         Business And Summary Of Significant Accounting      HTML     95K 
                Policies                                                         
29: R11         Revenue From Contracts With Customers               HTML     66K 
30: R12         Stock-Based Compensation                            HTML     87K 
31: R13         Segment Reporting                                   HTML     67K 
32: R14         Debt And Liquidity                                  HTML     62K 
33: R15         Goodwill And Other Intangible Assets                HTML     59K 
34: R16         Interest Expense                                    HTML     56K 
35: R17         Fair Value Measurements And Derivative Instruments  HTML    143K 
36: R18         Supplementary Balance Sheet Detail                  HTML     81K 
37: R19         Leases                                              HTML     77K 
38: R20         Retirement Plans And Postretirement Benefits        HTML    208K 
39: R21         Commitments and Contingencies                       HTML     61K 
40: R22         Income Taxes                                        HTML    130K 
41: R23         Stockholders' Equity                                HTML     55K 
42: R24         Earnings Per Share                                  HTML     56K 
43: R25         Other (Income) Expense, net                         HTML     54K 
44: R26         Subsequent Events                                   HTML     41K 
45: R27         Business And Summary Of Significant Accounting      HTML    156K 
                Policies (Policy)                                                
46: R28         Business And Summary Of Significant Accounting      HTML     49K 
                Policies (Tables)                                                
47: R29         Revenue From Contracts With Customers (Tables)      HTML     61K 
48: R30         Stock-Based Compensation (Tables)                   HTML     81K 
49: R31         Segment Reporting (Tables)                          HTML     66K 
50: R32         Debt And Liquidity (Tables)                         HTML     53K 
51: R33         Goodwill And Other Intangible Assets (Tables)       HTML     59K 
52: R34         Interest Expense (Tables)                           HTML     53K 
53: R35         Fair Value Measurements And Derivative Instruments  HTML    143K 
                (Tables)                                                         
54: R36         Supplementary Balance Sheet Detail (Tables)         HTML     83K 
55: R37         Leases (Tables)                                     HTML     81K 
56: R38         Retirement Plans And Postretirement Benefits        HTML    208K 
                (Tables)                                                         
57: R39         Commitments and Contingencies (Tables)              HTML     46K 
58: R40         Income Taxes (Tables)                               HTML    133K 
59: R41         Stockholders' Equity (Tables)                       HTML     48K 
60: R42         Earnings Per Share (Tables)                         HTML     54K 
61: R43         Other (Income) Expense, net (Tables)                HTML     51K 
62: R44         Business And Summary Of Significant Accounting      HTML     55K 
                Policies (Narrative) (Details)                                   
63: R45         Business And Summary Of Significant Accounting      HTML     45K 
                Policies (Narrative) (Details 1)                                 
64: R46         Business And Summary Of Significant Accounting      HTML     60K 
                Policies (Narrative) (Details 2)                                 
65: R47         Business And Summary Of Significant Accounting      HTML     44K 
                Policies (Narrative) (Details 3)                                 
66: R48         Business And Summary Of Significant Accounting      HTML     42K 
                Policies (Narrative) (Details 4)                                 
67: R49         Business And Summary Of Significant Accounting      HTML     53K 
                Policies (Ranges Of Estimated Useful Lives)                      
                (Details)                                                        
68: R50         Business And Summary Of Significant Accounting      HTML     51K 
                Policies (Schedule Of Estimated Useful Lives For                 
                Each Major Category Of Amortizable Intangible                    
                Assets) (Details)                                                
69: R51         Revenue From Contracts With Customers -             HTML     51K 
                Disaggregation of Revenue (Details)                              
70: R52         Revenue From Contracts With Customers - Contract    HTML     47K 
                Balances Outstanding (Details)                                   
71: R53         Revenue From Contracts With Customers - Remaining   HTML     56K 
                Performance Obligation (Details)                                 
72: R54         Revenue From Contracts With Customers - Narratives  HTML     47K 
                (Details)                                                        
73: R55         Stock-Based Compensation - Narratives (Details)     HTML     44K 
74: R56         Stock-Based Compensation - Narratives (Details 2)   HTML     59K 
75: R57         Stock-Based Compensation - Narratives (Details 3)   HTML     82K 
76: R58         Stock-Based Compensation - Narratives (Details 4)   HTML     79K 
77: R59         Stock-Based Compensation - Valuation Assumptions    HTML     56K 
                (Details)                                                        
78: R60         Stock-Based Compensation - Stock Options            HTML     86K 
                Outstanding and Exercisable (Details)                            
79: R61         Stock-Based Compensation - Unvested Stock Options   HTML     58K 
                Rollforward (Details)                                            
80: R62         Stock-Based Compensation - Restricted Stock Units   HTML     63K 
                Rollforward (Details)                                            
81: R63         Segment Reporting (Schedule Of Financial            HTML     45K 
                Information Concerning Reportable Segments)                      
                (Details)                                                        
82: R64         Segment Reporting Revenue from External Customers   HTML     53K 
                by Products and Services (Details)                               
83: R65         Segment Reporting Summary Of Information Of         HTML     56K 
                Long-Lived Assets In Different Geographic Areas                  
                (Details)                                                        
84: R66         Debt And Liquidity (Schedule Of Long-Term Debt)     HTML     59K 
                (Details)                                                        
85: R67         Debt And Liquidity (2018 Term Loan and 2018         HTML     93K 
                Revolving Credit Facility) (Details)                             
86: R68         Debt And Liquidity (2018 Credit Facility,           HTML     64K 
                Revolving Credit Facility ) (Details)                            
87: R69         Debt And Liquidity (2020 Senior Notes) (Details)    HTML     60K 
88: R70         Goodwill And Other Intangible Assets (Schedule Of   HTML     55K 
                Intangible Assets With Determinable Useful Lives                 
                By Major Category) (Details)                                     
89: R71         Goodwill And Other Intangible Assets (Narrative)    HTML     59K 
                (Details)                                                        
90: R72         Interest Expense (Details)                          HTML     54K 
91: R73         Interest Expense - Narrative (Details)              HTML     62K 
92: R74         Fair Value Measurements And Derivative Instruments  HTML     63K 
                (Narrative) (Details)                                            
93: R75         Fair Value Measurements And Derivative Instruments  HTML     48K 
                (Schedule Of Realized (Gains) Losses On                          
                Derivatives Recognized In Statement Of Operations)               
                (Details)                                                        
94: R76         Fair Value Measurements Level Table (Details)       HTML     87K 
95: R77         Fair Value Measurements And Derivative Instruments  HTML     88K 
                (Details)                                                        
96: R78         Fair Value Measurements And Derivative Instruments  HTML     52K 
                (Details 1)                                                      
97: R79         Fair Value Measurements And Derivative Instruments  HTML     61K 
                (Details 2)                                                      
98: R80         Fair Value Measurements And Derivative Instruments  HTML     49K 
                (Details 3)                                                      
99: R81         Fair Value Measurements And Derivative Instruments  HTML     58K 
                (Details 4)                                                      
100: R82         Supplementary Balance Sheet Detail (Schedule Of     HTML     90K  
                Amounts Recognized In Balance Sheet) (Details)                   
101: R83         Supplementary Balance Sheet Detail (Schedule Of     HTML     41K  
                Amounts Recognized In Balance Sheet, Footnote)                   
                (Details)                                                        
102: R84         Supplementary Balance Sheet Detail (Schedule Of     HTML     50K  
                Analysis Of The Allowance For Doubtful Accounts)                 
                (Details)                                                        
103: R85         Leases - Lease Cost (Details)                       HTML     48K  
104: R86         Leases - Supplemental Cash Flows (Details)          HTML     43K  
105: R87         Leases - Supplemental Balance Sheet (Details)       HTML     58K  
106: R88         Leases - Operating Lease Maturity Schedule          HTML     58K  
                (Details)                                                        
107: R89         Retirement Plans And Postretirement Benefits        HTML     73K  
                (Narrative) (Details)                                            
108: R90         Retirement Plans And Postretirement Benefits        HTML     64K  
                (Components Of Consolidated Net Pension Costs                    
                Retirement Plans) (Details)                                      
109: R91         Retirement Plans And Postretirement Benefits        HTML    100K  
                (Reconciliation Of Pension Plans' Benefit                        
                Obligations, Fair Value Of Assets Retirement                     
                Plans) (Details)                                                 
110: R92         Retirement Plans And Postretirement Benefits (Fair  HTML     80K  
                Asset Values Of Plan Assets) (Details)                           
111: R93         Retirement Plans And Postretirement Benefits (Fair  HTML     53K  
                Value Hierarchy, Assets At Fair Value) (Details)                 
112: R94         Retirement Plans And Postretirement Benefits        HTML     52K  
                (Assumptions Used To Determine Net Pension Costs                 
                And Projected Benefit Obligations) (Details)                     
113: R95         Retirement Plans And Postretirement Benefits        HTML     50K  
                (Retirement Plan Weighted Average Asset                          
                Allocations) (Details)                                           
114: R96         Retirement Plans And Postretirement Benefits        HTML     49K  
                (Pension Plans With An Accumulated Benefit                       
                Obligation In Excess Of Plan Assets) (Details)                   
115: R97         Retirement Plans And Postretirement Benefits        HTML     48K  
                (Pension Plans With Projected Benefit Obligation                 
                In Excess Of Plan Assets) (Details)                              
116: R98         Retirement Plans And Postretirement Benefits        HTML     61K  
                (Projected Future Pension Plan Cash Flow By Year)                
                (Details)                                                        
117: R99         Retirement Plans And Postretirement Benefits        HTML     52K  
                (Components Of Net Postretirement Costs) (Details)               
118: R100        Retirement Plans And Postretirement Benefits (Fair  HTML     85K  
                Value Of Assets Of, And The Funded Status Of,                    
                Postretirement Plans) (Details)                                  
119: R101        Retirement Plans And Postretirement Benefits (Net   HTML     43K  
                Postretirement Benefit Costs And Postretirement                  
                Projected Benefit Obligation) (Details)                          
120: R102        Retirement Plans And Postretirement Benefits        HTML     61K  
                (Projected Future Postretirement Cash Flow By                    
                Year) (Details)                                                  
121: R103        Commitments and Contingencies - Product Warranty    HTML     46K  
                (Details)                                                        
122: R104        Commitments and Contingencies - Narratives          HTML     57K  
                (Details)                                                        
123: R105        Commitments and Contingencies - Tax Receivable      HTML     55K  
                Agreement (Details)                                              
124: R106        Commitments and Contingencies - Long-term           HTML     48K  
                Incentive Plan (Details)                                         
125: R107        Income Taxes (Narrative) (Details)                  HTML     51K  
126: R108        Income Taxes (Narrative) (Details 2)                HTML     49K  
127: R109        Income Taxes (Schedule Of U.S. And Non-U.S.         HTML     49K  
                Components Of Income Before Provision For Income                 
                Taxes) (Details)                                                 
128: R110        Income Taxes (Schedule Of Income Tax Expense        HTML     58K  
                (Benefit)) (Details)                                             
129: R111        Income Taxes (Schedule Of Income Tax Expense        HTML     68K  
                (Benefit) Computed By Applying The U.S. Federal                  
                Income Tax Rate) (Details)                                       
130: R112        Income Taxes (Schedule Of Deferred Tax Assets And   HTML     81K  
                Deferred Tax Liabilities) (Details)                              
131: R113        Income Taxes (Schedule Of Valuation Allowance       HTML     45K  
                Activity) (Details)                                              
132: R114        Income Taxes (Reconciliation Of The Beginning And   HTML     48K  
                Ending Amount Of Unrecognized Tax Benefits)                      
                (Details)                                                        
133: R115        Stockholders' Equity (Schedule Of Accumulated       HTML     48K  
                Other Comprehensive Loss) (Details)                              
134: R116        Stockholders' Equity - Narratives (Details)         HTML     53K  
135: R117        Earnings Per Share (Details)                        HTML     72K  
136: R118        Earnings Per Share Narrative (Details)              HTML     43K  
137: R119        Other (Income) Expense, net - Components of Other   HTML     49K  
                (Income) Expense (Details)                                       
138: R120        Other (Income) Expense, net - Narrative (Details)   HTML     45K  
139: R121        Subsequent Events (Details)                         HTML     46K  
142: XML         IDEA XML File -- Filing Summary                      XML    276K  
140: XML         XBRL Instance -- gti-20221231_htm                    XML   3.38M  
141: EXCEL       IDEA Workbook of Financial Reports                  XLSX    258K  
15: EX-101.CAL  XBRL Calculations -- gti-20221231_cal                XML    274K 
16: EX-101.DEF  XBRL Definitions -- gti-20221231_def                 XML   1.19M 
17: EX-101.LAB  XBRL Labels -- gti-20221231_lab                      XML   2.44M 
18: EX-101.PRE  XBRL Presentations -- gti-20221231_pre               XML   1.84M 
14: EX-101.SCH  XBRL Schema -- gti-20221231                          XSD    248K 
143: JSON        XBRL Instance as JSON Data -- MetaLinks              688±  1.09M  
144: ZIP         XBRL Zipped Folder -- 0000931148-23-000035-xbrl      Zip    821K

‘EX-101.DEF’ — XBRL Definitions — gti-20221231_def

This Exhibit is an XBRL XML File.

<?xml version="1.0" encoding="windows-1252"?>

<link:linkbase 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" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>

<link:roleRef roleURI="http://www.graftech.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" xlink:href="gti-20221231.xsd#ConsolidatedStatementsOfStockholdersEquity"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="extended" id="i4b4cfd302ead423d8b48112ac14d18b8_ConsolidatedStatementsOfStockholdersEquity">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_28de53c1-94bf-4cd0-b5b2-72fdd3c44d14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_28de53c1-94bf-4cd0-b5b2-72fdd3c44d14" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_ed4b2b82-fcd9-4ac0-9578-a341752d4ac4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssued"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_SharesIssued_ed4b2b82-fcd9-4ac0-9578-a341752d4ac4" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_d7724469-78c0-4541-884f-115e3e26e9a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_StockholdersEquity_d7724469-78c0-4541-884f-115e3e26e9a7" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_68881f10-dfb8-4be3-b152-5d194daa41c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_NetIncomeLoss_68881f10-dfb8-4be3-b152-5d194daa41c9" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ed00c1a5-f6f4-49e1-869b-6dba782b3f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ed00c1a5-f6f4-49e1-869b-6dba782b3f6e" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_d9495805-723b-48ed-96cf-4e8db15c62cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ed00c1a5-f6f4-49e1-869b-6dba782b3f6e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_d9495805-723b-48ed-96cf-4e8db15c62cf" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_e626ec8f-9340-4958-96aa-75ca9713550f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ed00c1a5-f6f4-49e1-869b-6dba782b3f6e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_e626ec8f-9340-4958-96aa-75ca9713550f" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_e77a0211-d145-492e-8713-4688b0fb8db9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ed00c1a5-f6f4-49e1-869b-6dba782b3f6e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_e77a0211-d145-492e-8713-4688b0fb8db9" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f1fe0b05-1626-4ef3-ba47-cb92df82f95b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ed00c1a5-f6f4-49e1-869b-6dba782b3f6e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f1fe0b05-1626-4ef3-ba47-cb92df82f95b" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_3f6b4fa8-f6d4-4248-9b47-1b8ae954aca2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_3f6b4fa8-f6d4-4248-9b47-1b8ae954aca2" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_4ef38cc5-13a5-4f70-9f7d-cc6370968951" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_4ef38cc5-13a5-4f70-9f7d-cc6370968951" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_7070a9ae-5395-4b98-bab8-1604159e9eae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_7070a9ae-5395-4b98-bab8-1604159e9eae" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7a71e45a-b50e-42bb-8f60-12d37fc43e5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7a71e45a-b50e-42bb-8f60-12d37fc43e5d" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_4c1ee9f2-1aff-4742-a8bb-ac19e2958839" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_4c1ee9f2-1aff-4742-a8bb-ac19e2958839" xlink:type="arc" order="9"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_4c5fc217-deff-488f-a70a-7f21e14cd87a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_4c5fc217-deff-488f-a70a-7f21e14cd87a" xlink:type="arc" order="10"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_989dbff1-059e-458a-a2be-5b5dd0d8d829" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_989dbff1-059e-458a-a2be-5b5dd0d8d829" xlink:type="arc" order="11"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_309b8206-549d-4505-8880-cb20a1a8bbaf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_309b8206-549d-4505-8880-cb20a1a8bbaf" xlink:type="arc" order="12"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_cbc92cf8-36f4-4ead-bae4-419380d2bf6f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsCommonStockCash"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_DividendsCommonStockCash_cbc92cf8-36f4-4ead-bae4-419380d2bf6f" xlink:type="arc" order="13"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdateExtensibleList_bfa14cfd-3420-4cbb-8d03-8b6b2f6dc70c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountingStandardsUpdateExtensibleList"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cc4727c0-287e-4cc8-9fb7-6cdd741f750f" xlink:to="loc_us-gaap_AccountingStandardsUpdateExtensibleList_bfa14cfd-3420-4cbb-8d03-8b6b2f6dc70c" xlink:type="arc" order="14"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_593ee28f-2e73-47d9-8251-1bfee16090b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssued"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_4e39128f-1fdc-4ada-bf1a-2148d932825c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_93256981-e6b1-427d-8783-ea83097364bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_28de53c1-94bf-4cd0-b5b2-72fdd3c44d14" xlink:to="loc_us-gaap_StatementTable_93256981-e6b1-427d-8783-ea83097364bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_a7309ea0-7ea0-48ec-a0fe-372cc8e86429" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_93256981-e6b1-427d-8783-ea83097364bb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_a7309ea0-7ea0-48ec-a0fe-372cc8e86429" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a7309ea0-7ea0-48ec-a0fe-372cc8e86429_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_a7309ea0-7ea0-48ec-a0fe-372cc8e86429" xlink:to="loc_us-gaap_EquityComponentDomain_a7309ea0-7ea0-48ec-a0fe-372cc8e86429_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f21afd6e-7f2b-4a7e-b07e-edaa57fe3005" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_a7309ea0-7ea0-48ec-a0fe-372cc8e86429" xlink:to="loc_us-gaap_EquityComponentDomain_f21afd6e-7f2b-4a7e-b07e-edaa57fe3005" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_48cefb45-f09e-4809-a2a2-1dbbce2f1670" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f21afd6e-7f2b-4a7e-b07e-edaa57fe3005" xlink:to="loc_us-gaap_CommonStockMember_48cefb45-f09e-4809-a2a2-1dbbce2f1670" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_d19fe851-4ed9-4c1a-9870-01291d360456" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f21afd6e-7f2b-4a7e-b07e-edaa57fe3005" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_d19fe851-4ed9-4c1a-9870-01291d360456" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_51233369-e47a-45d9-a85c-ee63a03af3f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f21afd6e-7f2b-4a7e-b07e-edaa57fe3005" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_51233369-e47a-45d9-a85c-ee63a03af3f8" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_a119213a-ed26-42d6-bab8-63033950cae3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f21afd6e-7f2b-4a7e-b07e-edaa57fe3005" xlink:to="loc_us-gaap_RetainedEarningsMember_a119213a-ed26-42d6-bab8-63033950cae3" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_273daa1d-fdcc-4b4b-9abf-1f80268c2022" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_93256981-e6b1-427d-8783-ea83097364bb" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_273daa1d-fdcc-4b4b-9abf-1f80268c2022" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_273daa1d-fdcc-4b4b-9abf-1f80268c2022_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_273daa1d-fdcc-4b4b-9abf-1f80268c2022" xlink:to="loc_us-gaap_RelatedPartyDomain_273daa1d-fdcc-4b4b-9abf-1f80268c2022_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_3670765f-f2f7-4177-8561-c3956bf062c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_273daa1d-fdcc-4b4b-9abf-1f80268c2022" xlink:to="loc_us-gaap_RelatedPartyDomain_3670765f-f2f7-4177-8561-c3956bf062c1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_ee9a6837-8aff-4dad-b998-5746a78408fc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_AffiliatedEntityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_3670765f-f2f7-4177-8561-c3956bf062c1" xlink:to="loc_srt_AffiliatedEntityMember_ee9a6837-8aff-4dad-b998-5746a78408fc" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_25cde49a-2d7c-409a-b0bc-e64a1f7b5a34" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_93256981-e6b1-427d-8783-ea83097364bb" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_25cde49a-2d7c-409a-b0bc-e64a1f7b5a34" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_25cde49a-2d7c-409a-b0bc-e64a1f7b5a34_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_25cde49a-2d7c-409a-b0bc-e64a1f7b5a34" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_25cde49a-2d7c-409a-b0bc-e64a1f7b5a34_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_ab9ac0b1-106c-4507-89f8-8c2442ce56c5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_25cde49a-2d7c-409a-b0bc-e64a1f7b5a34" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_ab9ac0b1-106c-4507-89f8-8c2442ce56c5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_36e4809d-9b99-4aa2-b410-a42c457aa6f7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_ab9ac0b1-106c-4507-89f8-8c2442ce56c5" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_36e4809d-9b99-4aa2-b410-a42c457aa6f7" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical" xlink:type="simple" xlink:href="gti-20221231.xsd#ConsolidatedStatementsOfStockholdersEquityParenthetical"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical" xlink:type="extended" id="i49895c49aff34de5ac09b95fd89e90e1_ConsolidatedStatementsOfStockholdersEquityParenthetical">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2552594c-8699-46c4-8d72-c960834c1163" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_b1e23763-0cf8-44ed-a719-40208b22e568" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2552594c-8699-46c4-8d72-c960834c1163" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_b1e23763-0cf8-44ed-a719-40208b22e568" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_00d1ba9e-be58-40c1-8aae-3c2678b23eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2552594c-8699-46c4-8d72-c960834c1163" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_00d1ba9e-be58-40c1-8aae-3c2678b23eb1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_9957c166-20c0-44fd-a330-23257c5991c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2552594c-8699-46c4-8d72-c960834c1163" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_9957c166-20c0-44fd-a330-23257c5991c6" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_2e5d44d0-9067-4676-ade1-d9430acd4b7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2552594c-8699-46c4-8d72-c960834c1163" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_2e5d44d0-9067-4676-ade1-d9430acd4b7d" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_cf874285-159f-4e0e-839b-d3b2f2f44734" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2552594c-8699-46c4-8d72-c960834c1163" xlink:to="loc_us-gaap_StatementTable_cf874285-159f-4e0e-839b-d3b2f2f44734" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_38cd35e7-489b-4ad5-9ef1-1ed045daedf8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_cf874285-159f-4e0e-839b-d3b2f2f44734" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_38cd35e7-489b-4ad5-9ef1-1ed045daedf8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_38cd35e7-489b-4ad5-9ef1-1ed045daedf8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_38cd35e7-489b-4ad5-9ef1-1ed045daedf8" xlink:to="loc_us-gaap_RelatedPartyDomain_38cd35e7-489b-4ad5-9ef1-1ed045daedf8_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_30d90b69-e19e-4705-892c-b52333f77e4c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_38cd35e7-489b-4ad5-9ef1-1ed045daedf8" xlink:to="loc_us-gaap_RelatedPartyDomain_30d90b69-e19e-4705-892c-b52333f77e4c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_b9f44e63-e958-4885-8027-f4889e837ed9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_AffiliatedEntityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_30d90b69-e19e-4705-892c-b52333f77e4c" xlink:to="loc_srt_AffiliatedEntityMember_b9f44e63-e958-4885-8027-f4889e837ed9" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" id="iac05a9670e634955945d284a4c2c0e0b_BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_fbb7191c-2087-472f-8a39-1a7a5ce1dfd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_75fb8635-3a52-49ce-bd0d-5904ae6a9cda" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_fbb7191c-2087-472f-8a39-1a7a5ce1dfd6" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_75fb8635-3a52-49ce-bd0d-5904ae6a9cda" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_3e15891c-8093-4f9b-aff6-a0041e7db0f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_fbb7191c-2087-472f-8a39-1a7a5ce1dfd6" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_3e15891c-8093-4f9b-aff6-a0041e7db0f6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_48ac81a0-32e0-44dc-9920-12de8180a44f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_fbb7191c-2087-472f-8a39-1a7a5ce1dfd6" xlink:to="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_48ac81a0-32e0-44dc-9920-12de8180a44f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_82fe5b02-b05a-480b-92c7-ed0317efea09" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_48ac81a0-32e0-44dc-9920-12de8180a44f" xlink:to="loc_srt_ConsolidatedEntitiesAxis_82fe5b02-b05a-480b-92c7-ed0317efea09" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_82fe5b02-b05a-480b-92c7-ed0317efea09_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_82fe5b02-b05a-480b-92c7-ed0317efea09" xlink:to="loc_srt_ConsolidatedEntitiesDomain_82fe5b02-b05a-480b-92c7-ed0317efea09_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_804dde17-1298-4767-868b-0180c3b2a481" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_82fe5b02-b05a-480b-92c7-ed0317efea09" xlink:to="loc_srt_ConsolidatedEntitiesDomain_804dde17-1298-4767-868b-0180c3b2a481" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GrafTechInternationalLtdMember_25834aa5-ee53-414a-96a2-74853d8d9a23" xlink:href="gti-20221231.xsd#gti_GrafTechInternationalLtdMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_804dde17-1298-4767-868b-0180c3b2a481" xlink:to="loc_gti_GrafTechInternationalLtdMember_25834aa5-ee53-414a-96a2-74853d8d9a23" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_56e94594-10b4-4a77-8e8a-b75b40091347" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_48ac81a0-32e0-44dc-9920-12de8180a44f" xlink:to="loc_dei_LegalEntityAxis_56e94594-10b4-4a77-8e8a-b75b40091347" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_56e94594-10b4-4a77-8e8a-b75b40091347_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_56e94594-10b4-4a77-8e8a-b75b40091347" xlink:to="loc_dei_EntityDomain_56e94594-10b4-4a77-8e8a-b75b40091347_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f0881b20-c7d4-447b-b376-f2cb9cb7927a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_56e94594-10b4-4a77-8e8a-b75b40091347" xlink:to="loc_dei_EntityDomain_f0881b20-c7d4-447b-b376-f2cb9cb7927a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_BrookfieldMember_f02a3fd9-265a-4c10-a239-c9104646ed5f" xlink:href="gti-20221231.xsd#gti_BrookfieldMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_f0881b20-c7d4-447b-b376-f2cb9cb7927a" xlink:to="loc_gti_BrookfieldMember_f02a3fd9-265a-4c10-a239-c9104646ed5f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_6d88aa30-a61e-437a-833a-7674ee3de7a5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_48ac81a0-32e0-44dc-9920-12de8180a44f" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_6d88aa30-a61e-437a-833a-7674ee3de7a5" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_6d88aa30-a61e-437a-833a-7674ee3de7a5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_6d88aa30-a61e-437a-833a-7674ee3de7a5" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_6d88aa30-a61e-437a-833a-7674ee3de7a5_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_60a0e167-17e4-4270-a1a9-97441a3cfa69" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_6d88aa30-a61e-437a-833a-7674ee3de7a5" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_60a0e167-17e4-4270-a1a9-97441a3cfa69" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GrafTechInternationalLtdMember_6ee8556f-4358-4509-be43-900cd992b607" xlink:href="gti-20221231.xsd#gti_GrafTechInternationalLtdMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_60a0e167-17e4-4270-a1a9-97441a3cfa69" xlink:to="loc_gti_GrafTechInternationalLtdMember_6ee8556f-4358-4509-be43-900cd992b607" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails1" xlink:type="simple" xlink:href="gti-20221231.xsd#BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails1"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails1" xlink:type="extended" id="ieecf46858f6a4f68b5a9b9f32ac63a75_BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails1">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_eb7a142a-ea3d-43a2-9503-5ec1c2f4cc4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_RevenueFromContractWithCustomerDeliveryTerm_581b4884-496f-4674-9ae4-e3f7df6142e1" xlink:href="gti-20221231.xsd#gti_RevenueFromContractWithCustomerDeliveryTerm"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_eb7a142a-ea3d-43a2-9503-5ec1c2f4cc4e" xlink:to="loc_gti_RevenueFromContractWithCustomerDeliveryTerm_581b4884-496f-4674-9ae4-e3f7df6142e1" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_RevenueFromContractWithCustomerTermOfContract_5377bf86-c0e1-4890-a9ea-bcf9d0d2db4b" xlink:href="gti-20221231.xsd#gti_RevenueFromContractWithCustomerTermOfContract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_eb7a142a-ea3d-43a2-9503-5ec1c2f4cc4e" xlink:to="loc_gti_RevenueFromContractWithCustomerTermOfContract_5377bf86-c0e1-4890-a9ea-bcf9d0d2db4b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_cd702660-53be-4c09-9808-b060ea6ce275" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_eb7a142a-ea3d-43a2-9503-5ec1c2f4cc4e" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_cd702660-53be-4c09-9808-b060ea6ce275" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9106ed56-5c87-4122-83e6-72465596cd28" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_cd702660-53be-4c09-9808-b060ea6ce275" xlink:to="loc_srt_RangeAxis_9106ed56-5c87-4122-83e6-72465596cd28" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9106ed56-5c87-4122-83e6-72465596cd28_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9106ed56-5c87-4122-83e6-72465596cd28" xlink:to="loc_srt_RangeMember_9106ed56-5c87-4122-83e6-72465596cd28_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_04141751-9c28-4466-a7e7-64fb192535fd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9106ed56-5c87-4122-83e6-72465596cd28" xlink:to="loc_srt_RangeMember_04141751-9c28-4466-a7e7-64fb192535fd" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4c87ae0a-61e2-4f20-ba2c-24dc18df1f9d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_04141751-9c28-4466-a7e7-64fb192535fd" xlink:to="loc_srt_MinimumMember_4c87ae0a-61e2-4f20-ba2c-24dc18df1f9d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4806186f-184e-435f-837a-4eab4f342765" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_04141751-9c28-4466-a7e7-64fb192535fd" xlink:to="loc_srt_MaximumMember_4806186f-184e-435f-837a-4eab4f342765" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails3" xlink:type="simple" xlink:href="gti-20221231.xsd#BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails3"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails3" xlink:type="extended" id="icb64b28590a941ae94b955651bb31f87_BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails3">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingAssetsLineItems_b9eeff93-0a90-4a7e-927a-1d80d2a2c607" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OffsettingAssetsLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_763489f8-a986-4d93-8b44-4ed25e8b138e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTermOfContract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_b9eeff93-0a90-4a7e-927a-1d80d2a2c607" xlink:to="loc_us-gaap_DerivativeTermOfContract_763489f8-a986-4d93-8b44-4ed25e8b138e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingAssetsTable_8ee74f15-2f57-40a4-9fa4-02902aa41da6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OffsettingAssetsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OffsettingAssetsLineItems_b9eeff93-0a90-4a7e-927a-1d80d2a2c607" xlink:to="loc_us-gaap_OffsettingAssetsTable_8ee74f15-2f57-40a4-9fa4-02902aa41da6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_38188b0b-d6ab-49da-9f6e-0080b062e39a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OffsettingAssetsTable_8ee74f15-2f57-40a4-9fa4-02902aa41da6" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_38188b0b-d6ab-49da-9f6e-0080b062e39a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_38188b0b-d6ab-49da-9f6e-0080b062e39a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_38188b0b-d6ab-49da-9f6e-0080b062e39a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_38188b0b-d6ab-49da-9f6e-0080b062e39a_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e615a774-fc88-4446-a41c-521a5f339a35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_38188b0b-d6ab-49da-9f6e-0080b062e39a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e615a774-fc88-4446-a41c-521a5f339a35" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_22a1cc44-14a9-497f-b629-40e8da107ef9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e615a774-fc88-4446-a41c-521a5f339a35" xlink:to="loc_us-gaap_InterestRateSwapMember_22a1cc44-14a9-497f-b629-40e8da107ef9" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_InterestRateSwapTwoMember_01fec660-4e0c-48ed-a13e-3404650ace9a" xlink:href="gti-20221231.xsd#gti_InterestRateSwapTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e615a774-fc88-4446-a41c-521a5f339a35" xlink:to="loc_gti_InterestRateSwapTwoMember_01fec660-4e0c-48ed-a13e-3404650ace9a" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails4" xlink:type="simple" xlink:href="gti-20221231.xsd#BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails4"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails4" xlink:type="extended" id="ie64968fe090e4d3397ac5cc929071a2a_BusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails4">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2917af6b-99fd-4daa-b445-2bd9f5528d46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DueToRelatedPartyBasisSpreadOnVariableRate_9da0d12a-0af2-453f-b953-32ccfca7b22a" xlink:href="gti-20221231.xsd#gti_DueToRelatedPartyBasisSpreadOnVariableRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2917af6b-99fd-4daa-b445-2bd9f5528d46" xlink:to="loc_gti_DueToRelatedPartyBasisSpreadOnVariableRate_9da0d12a-0af2-453f-b953-32ccfca7b22a" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_9ec082be-97a9-42f2-97cc-ac1b91fdaae2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2917af6b-99fd-4daa-b445-2bd9f5528d46" xlink:to="loc_us-gaap_DebtInstrumentTable_9ec082be-97a9-42f2-97cc-ac1b91fdaae2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_8b82a26b-99a2-441d-b7bb-30991e10c215" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9ec082be-97a9-42f2-97cc-ac1b91fdaae2" xlink:to="loc_us-gaap_VariableRateAxis_8b82a26b-99a2-441d-b7bb-30991e10c215" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_8b82a26b-99a2-441d-b7bb-30991e10c215_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_8b82a26b-99a2-441d-b7bb-30991e10c215" xlink:to="loc_us-gaap_VariableRateDomain_8b82a26b-99a2-441d-b7bb-30991e10c215_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_af2a6ccf-2997-4414-9bb5-60af74051d07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_8b82a26b-99a2-441d-b7bb-30991e10c215" xlink:to="loc_us-gaap_VariableRateDomain_af2a6ccf-2997-4414-9bb5-60af74051d07" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_1b1073b8-bbcf-412b-a90e-94e9b0e6bfca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_af2a6ccf-2997-4414-9bb5-60af74051d07" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_1b1073b8-bbcf-412b-a90e-94e9b0e6bfca" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesRangesOfEstimatedUsefulLivesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#BusinessAndSummaryOfSignificantAccountingPoliciesRangesOfEstimatedUsefulLivesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesRangesOfEstimatedUsefulLivesDetails" xlink:type="extended" id="ib41bb8d41dd4452c80054538be25d840_BusinessAndSummaryOfSignificantAccountingPoliciesRangesOfEstimatedUsefulLivesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_450b31cf-f591-4383-b0f0-0fac953f367d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_fc32bbe8-c204-4b9d-bc1c-185a5063cf83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_450b31cf-f591-4383-b0f0-0fac953f367d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_fc32bbe8-c204-4b9d-bc1c-185a5063cf83" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2bab4925-20a9-4c59-9d61-68d3e13de1f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_450b31cf-f591-4383-b0f0-0fac953f367d" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2bab4925-20a9-4c59-9d61-68d3e13de1f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_86929c82-c767-4c9a-ace8-040696803367" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2bab4925-20a9-4c59-9d61-68d3e13de1f8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_86929c82-c767-4c9a-ace8-040696803367" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_86929c82-c767-4c9a-ace8-040696803367_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_86929c82-c767-4c9a-ace8-040696803367" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_86929c82-c767-4c9a-ace8-040696803367_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_26c8c76d-be09-46a8-85b4-d43aec90ed99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_86929c82-c767-4c9a-ace8-040696803367" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_26c8c76d-be09-46a8-85b4-d43aec90ed99" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_f4d96a1e-5c46-4f7a-b2e4-3152fc7b6871" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BuildingMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_26c8c76d-be09-46a8-85b4-d43aec90ed99" xlink:to="loc_us-gaap_BuildingMember_f4d96a1e-5c46-4f7a-b2e4-3152fc7b6871" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndLandImprovementsMember_cec07fa7-14f8-4214-8bc9-1ad0df443c8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LandAndLandImprovementsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_26c8c76d-be09-46a8-85b4-d43aec90ed99" xlink:to="loc_us-gaap_LandAndLandImprovementsMember_cec07fa7-14f8-4214-8bc9-1ad0df443c8e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_35032d74-0629-4518-bcc0-8c0d11f011a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MachineryAndEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_26c8c76d-be09-46a8-85b4-d43aec90ed99" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_35032d74-0629-4518-bcc0-8c0d11f011a9" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_d4bec94e-839e-48ab-96a9-cee8a8de99a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FurnitureAndFixturesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_26c8c76d-be09-46a8-85b4-d43aec90ed99" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_d4bec94e-839e-48ab-96a9-cee8a8de99a1" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8abb480a-70e2-48dc-aa73-5358536f6f8c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2bab4925-20a9-4c59-9d61-68d3e13de1f8" xlink:to="loc_srt_RangeAxis_8abb480a-70e2-48dc-aa73-5358536f6f8c" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8abb480a-70e2-48dc-aa73-5358536f6f8c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_8abb480a-70e2-48dc-aa73-5358536f6f8c" xlink:to="loc_srt_RangeMember_8abb480a-70e2-48dc-aa73-5358536f6f8c_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4b81a21e-1646-4e9b-9a50-f7565b51e5c6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_8abb480a-70e2-48dc-aa73-5358536f6f8c" xlink:to="loc_srt_RangeMember_4b81a21e-1646-4e9b-9a50-f7565b51e5c6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3615b00e-9ee4-4e35-9e93-143f16abae9f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4b81a21e-1646-4e9b-9a50-f7565b51e5c6" xlink:to="loc_srt_MinimumMember_3615b00e-9ee4-4e35-9e93-143f16abae9f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2c46bc7c-1236-4c1c-99b0-26e54b695cd6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4b81a21e-1646-4e9b-9a50-f7565b51e5c6" xlink:to="loc_srt_MaximumMember_2c46bc7c-1236-4c1c-99b0-26e54b695cd6" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesForEachMajorCategoryOfAmortizableIntangibleAssetsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#BusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesForEachMajorCategoryOfAmortizableIntangibleAssetsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesForEachMajorCategoryOfAmortizableIntangibleAssetsDetails" xlink:type="extended" id="i9caa04cda9f24d00bccdece0ee58f7bb_BusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesForEachMajorCategoryOfAmortizableIntangibleAssetsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8255e5c5-ff23-4177-ae18-e23a1fbc7fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_d4e76923-9238-4032-8dd0-1b66b2f4bf53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8255e5c5-ff23-4177-ae18-e23a1fbc7fc1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_d4e76923-9238-4032-8dd0-1b66b2f4bf53" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_04c3ac39-cfed-4b04-a98e-962436dd941b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8255e5c5-ff23-4177-ae18-e23a1fbc7fc1" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_04c3ac39-cfed-4b04-a98e-962436dd941b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6854e77d-c954-489a-8f6f-97b79ca81395" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_04c3ac39-cfed-4b04-a98e-962436dd941b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6854e77d-c954-489a-8f6f-97b79ca81395" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6854e77d-c954-489a-8f6f-97b79ca81395_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6854e77d-c954-489a-8f6f-97b79ca81395" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6854e77d-c954-489a-8f6f-97b79ca81395_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e52fb78f-f301-4b35-9ba4-e17feaa88ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6854e77d-c954-489a-8f6f-97b79ca81395" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e52fb78f-f301-4b35-9ba4-e17feaa88ef0" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_a86fc893-0e43-4bde-9f5b-9d62d0e651d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e52fb78f-f301-4b35-9ba4-e17feaa88ef0" xlink:to="loc_us-gaap_TradeNamesMember_a86fc893-0e43-4bde-9f5b-9d62d0e651d5" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyEquipmentMember_ad160813-241e-4df4-99eb-e14d121bdd06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e52fb78f-f301-4b35-9ba4-e17feaa88ef0" xlink:to="loc_us-gaap_TechnologyEquipmentMember_ad160813-241e-4df4-99eb-e14d121bdd06" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_24d3bfa9-f2fd-4c3a-922f-fa177ba27704" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e52fb78f-f301-4b35-9ba4-e17feaa88ef0" xlink:to="loc_us-gaap_CustomerRelationshipsMember_24d3bfa9-f2fd-4c3a-922f-fa177ba27704" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8b42e391-bfb2-4206-bc3d-8718cdadfccb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_04c3ac39-cfed-4b04-a98e-962436dd941b" xlink:to="loc_srt_RangeAxis_8b42e391-bfb2-4206-bc3d-8718cdadfccb" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8b42e391-bfb2-4206-bc3d-8718cdadfccb_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_8b42e391-bfb2-4206-bc3d-8718cdadfccb" xlink:to="loc_srt_RangeMember_8b42e391-bfb2-4206-bc3d-8718cdadfccb_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bf56404c-4987-4cae-9ebd-09aed0ff0fcd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_8b42e391-bfb2-4206-bc3d-8718cdadfccb" xlink:to="loc_srt_RangeMember_bf56404c-4987-4cae-9ebd-09aed0ff0fcd" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c0b9fdbc-07fc-4a66-b5eb-65f9f959f72b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bf56404c-4987-4cae-9ebd-09aed0ff0fcd" xlink:to="loc_srt_MinimumMember_c0b9fdbc-07fc-4a66-b5eb-65f9f959f72b" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_be0cf869-4a86-4930-b108-e90b6f207e42" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bf56404c-4987-4cae-9ebd-09aed0ff0fcd" xlink:to="loc_srt_MaximumMember_be0cf869-4a86-4930-b108-e90b6f207e42" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RevenueFromContractsWithCustomersDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RevenueFromContractsWithCustomersDisaggregationofRevenueDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RevenueFromContractsWithCustomersDisaggregationofRevenueDetails" xlink:type="extended" id="ibee81b7a633c4b5dbad30aff3fae2a2b_RevenueFromContractsWithCustomersDisaggregationofRevenueDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_aacda9a6-644b-472e-b70b-43853890aaaf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_11ef6cc8-18a2-4778-9881-876eb275ae10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_aacda9a6-644b-472e-b70b-43853890aaaf" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_11ef6cc8-18a2-4778-9881-876eb275ae10" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_82c9325f-79d2-494d-babf-e993cb8a045a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_aacda9a6-644b-472e-b70b-43853890aaaf" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_82c9325f-79d2-494d-babf-e993cb8a045a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationAxis_a83780b8-0f47-4b56-99b3-2c5279a9ad10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerDurationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_82c9325f-79d2-494d-babf-e993cb8a045a" xlink:to="loc_us-gaap_ContractWithCustomerDurationAxis_a83780b8-0f47-4b56-99b3-2c5279a9ad10" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_a83780b8-0f47-4b56-99b3-2c5279a9ad10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerDurationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_a83780b8-0f47-4b56-99b3-2c5279a9ad10" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_a83780b8-0f47-4b56-99b3-2c5279a9ad10_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_4448aa7c-c20d-4530-add8-610d16e98b98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerDurationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_a83780b8-0f47-4b56-99b3-2c5279a9ad10" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_4448aa7c-c20d-4530-add8-610d16e98b98" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermContractWithCustomerMember_a3d43a3f-bf80-4bfb-b69e-e7ad34e91bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermContractWithCustomerMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerDurationDomain_4448aa7c-c20d-4530-add8-610d16e98b98" xlink:to="loc_us-gaap_LongTermContractWithCustomerMember_a3d43a3f-bf80-4bfb-b69e-e7ad34e91bfa" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermContractWithCustomerMember_a49fefe1-ad79-404f-a467-1d3891c9d921" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermContractWithCustomerMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerDurationDomain_4448aa7c-c20d-4530-add8-610d16e98b98" xlink:to="loc_us-gaap_ShortTermContractWithCustomerMember_a49fefe1-ad79-404f-a467-1d3891c9d921" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_OtherMember_cdf133b0-28ba-401b-a0b4-801333488af5" xlink:href="gti-20221231.xsd#gti_OtherMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerDurationDomain_4448aa7c-c20d-4530-add8-610d16e98b98" xlink:to="loc_gti_OtherMember_cdf133b0-28ba-401b-a0b4-801333488af5" xlink:type="arc" order="2"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails" xlink:type="extended" id="i574c6c1e089b4429a2187bfe66572452_RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_86d78d96-79c1-4127-805e-c246f908d14b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_72be72c7-5077-4233-a6e2-2dd37328c2ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_86d78d96-79c1-4127-805e-c246f908d14b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_72be72c7-5077-4233-a6e2-2dd37328c2ac" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_ba4c7076-05aa-4542-8429-e35fc312662d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_86d78d96-79c1-4127-805e-c246f908d14b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_ba4c7076-05aa-4542-8429-e35fc312662d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ce4f42d3-f96f-4140-83ae-67361f9b05eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_86d78d96-79c1-4127-805e-c246f908d14b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ce4f42d3-f96f-4140-83ae-67361f9b05eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_22b3e683-faa1-4db2-a7ac-62f3b8c66e54" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ce4f42d3-f96f-4140-83ae-67361f9b05eb" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_22b3e683-faa1-4db2-a7ac-62f3b8c66e54" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6db2cc1f-45c4-4f43-adfa-3683e55e698b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ce4f42d3-f96f-4140-83ae-67361f9b05eb" xlink:to="loc_srt_RangeAxis_6db2cc1f-45c4-4f43-adfa-3683e55e698b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6db2cc1f-45c4-4f43-adfa-3683e55e698b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6db2cc1f-45c4-4f43-adfa-3683e55e698b" xlink:to="loc_srt_RangeMember_6db2cc1f-45c4-4f43-adfa-3683e55e698b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_590fdc52-d87c-4901-a90f-4a95af89537b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6db2cc1f-45c4-4f43-adfa-3683e55e698b" xlink:to="loc_srt_RangeMember_590fdc52-d87c-4901-a90f-4a95af89537b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_11e98a31-aa01-445d-99f2-951bb0b5ddef" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_590fdc52-d87c-4901-a90f-4a95af89537b" xlink:to="loc_srt_MinimumMember_11e98a31-aa01-445d-99f2-951bb0b5ddef" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_91cc8e05-6892-47c1-b2d8-3b77ed27daf2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_590fdc52-d87c-4901-a90f-4a95af89537b" xlink:to="loc_srt_MaximumMember_91cc8e05-6892-47c1-b2d8-3b77ed27daf2" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails_1" xlink:type="simple" xlink:href="gti-20221231.xsd#RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails_1"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails_1" xlink:type="extended" id="if41fa83a05e9487ca538fc58b9adb26f_RevenueFromContractsWithCustomersRemainingPerformanceObligationDetails_1">

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_86d78d96-79c1-4127-805e-c246f908d14b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_ba4c7076-05aa-4542-8429-e35fc312662d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6db2cc1f-45c4-4f43-adfa-3683e55e698b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ce4f42d3-f96f-4140-83ae-67361f9b05eb" xlink:to="loc_srt_RangeAxis_6db2cc1f-45c4-4f43-adfa-3683e55e698b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6db2cc1f-45c4-4f43-adfa-3683e55e698b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_590fdc52-d87c-4901-a90f-4a95af89537b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_11e98a31-aa01-445d-99f2-951bb0b5ddef" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_91cc8e05-6892-47c1-b2d8-3b77ed27daf2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_590fdc52-d87c-4901-a90f-4a95af89537b" xlink:to="loc_srt_MaximumMember_91cc8e05-6892-47c1-b2d8-3b77ed27daf2" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RevenueFromContractsWithCustomersNarrativesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RevenueFromContractsWithCustomersNarrativesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RevenueFromContractsWithCustomersNarrativesDetails" xlink:type="extended" id="i5e043ef7e42d4210a0225904c203e06d_RevenueFromContractsWithCustomersNarrativesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_cbf1be63-24b0-421c-9ea5-cbf9ad066721" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_AccountsReceivableInvoicePaymentTermDaysRange_784bbd8d-6beb-4246-9a0b-c3a906513cf3" xlink:href="gti-20221231.xsd#gti_AccountsReceivableInvoicePaymentTermDaysRange"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_cbf1be63-24b0-421c-9ea5-cbf9ad066721" xlink:to="loc_gti_AccountsReceivableInvoicePaymentTermDaysRange_784bbd8d-6beb-4246-9a0b-c3a906513cf3" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_ab42de06-117c-468e-8100-dc809bd32e80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerAssetGrossCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_cbf1be63-24b0-421c-9ea5-cbf9ad066721" xlink:to="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_ab42de06-117c-468e-8100-dc809bd32e80" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ea4ac1be-4061-4150-b44e-ccf5dacfd3bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_cbf1be63-24b0-421c-9ea5-cbf9ad066721" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ea4ac1be-4061-4150-b44e-ccf5dacfd3bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7476495a-253b-4d03-a139-b364bfba6fbe" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ea4ac1be-4061-4150-b44e-ccf5dacfd3bc" xlink:to="loc_srt_RangeAxis_7476495a-253b-4d03-a139-b364bfba6fbe" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7476495a-253b-4d03-a139-b364bfba6fbe_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7476495a-253b-4d03-a139-b364bfba6fbe" xlink:to="loc_srt_RangeMember_7476495a-253b-4d03-a139-b364bfba6fbe_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a39766da-9107-4069-86be-3561826aa785" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7476495a-253b-4d03-a139-b364bfba6fbe" xlink:to="loc_srt_RangeMember_a39766da-9107-4069-86be-3561826aa785" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_035d6405-f62f-4851-b3c9-3221013331c7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a39766da-9107-4069-86be-3561826aa785" xlink:to="loc_srt_MinimumMember_035d6405-f62f-4851-b3c9-3221013331c7" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f71b6870-f2ad-4887-89ca-397c31271b5e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a39766da-9107-4069-86be-3561826aa785" xlink:to="loc_srt_MaximumMember_f71b6870-f2ad-4887-89ca-397c31271b5e" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationNarrativesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails" xlink:type="extended" id="i4fcc075ef32e4ef1a180eb311fef60be_StockBasedCompensationNarrativesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1c5f256a-878c-4d52-b7af-35438da022ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_b9c9de83-c21a-46b2-9a9a-b6611818768f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1c5f256a-878c-4d52-b7af-35438da022ef" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_b9c9de83-c21a-46b2-9a9a-b6611818768f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_f3968ba4-b5a3-4a15-b178-e4d7d045db88" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1c5f256a-878c-4d52-b7af-35438da022ef" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_f3968ba4-b5a3-4a15-b178-e4d7d045db88" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f5137a77-1c6f-4e05-aaf2-a334dcdf3628" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1c5f256a-878c-4d52-b7af-35438da022ef" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f5137a77-1c6f-4e05-aaf2-a334dcdf3628" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_d4f1f905-068b-4024-902b-3a2361257f96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f5137a77-1c6f-4e05-aaf2-a334dcdf3628" xlink:to="loc_us-gaap_PlanNameAxis_d4f1f905-068b-4024-902b-3a2361257f96" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d4f1f905-068b-4024-902b-3a2361257f96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_d4f1f905-068b-4024-902b-3a2361257f96" xlink:to="loc_us-gaap_PlanNameDomain_d4f1f905-068b-4024-902b-3a2361257f96_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_77039556-0991-4cfd-9968-91953a98cf3c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_d4f1f905-068b-4024-902b-3a2361257f96" xlink:to="loc_us-gaap_PlanNameDomain_77039556-0991-4cfd-9968-91953a98cf3c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_OmnibusEquityIncentivePlanMember_bf5bf9a8-bae9-435b-9b6b-bd4f2eca293a" xlink:href="gti-20221231.xsd#gti_OmnibusEquityIncentivePlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_77039556-0991-4cfd-9968-91953a98cf3c" xlink:to="loc_gti_OmnibusEquityIncentivePlanMember_bf5bf9a8-bae9-435b-9b6b-bd4f2eca293a" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails2" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationNarrativesDetails2"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails2" xlink:type="extended" id="i602b7dbbe668480888dabd0c4eedbd71_StockBasedCompensationNarrativesDetails2">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5233a1cb-7c18-4073-a4f3-c64879dcee71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_0d87b607-fd3c-4e49-b31d-184607758134" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5233a1cb-7c18-4073-a4f3-c64879dcee71" xlink:to="loc_us-gaap_ShareBasedCompensation_0d87b607-fd3c-4e49-b31d-184607758134" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost_f2e40f78-521f-485f-9876-fa7cb7813222" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5233a1cb-7c18-4073-a4f3-c64879dcee71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost_f2e40f78-521f-485f-9876-fa7cb7813222" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_f5867ac8-42a6-4d69-9225-115ab74a3de7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5233a1cb-7c18-4073-a4f3-c64879dcee71" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_f5867ac8-42a6-4d69-9225-115ab74a3de7" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_45a4a9df-c862-4f66-8384-0b8137137c10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5233a1cb-7c18-4073-a4f3-c64879dcee71" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_45a4a9df-c862-4f66-8384-0b8137137c10" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5233a1cb-7c18-4073-a4f3-c64879dcee71" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_ecbe47ff-fbfd-4b1e-8a4c-2960784b1e49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:to="loc_us-gaap_PlanNameAxis_ecbe47ff-fbfd-4b1e-8a4c-2960784b1e49" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_ecbe47ff-fbfd-4b1e-8a4c-2960784b1e49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_ecbe47ff-fbfd-4b1e-8a4c-2960784b1e49" xlink:to="loc_us-gaap_PlanNameDomain_ecbe47ff-fbfd-4b1e-8a4c-2960784b1e49_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d2f35363-1619-4255-a132-e8646e442d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_ecbe47ff-fbfd-4b1e-8a4c-2960784b1e49" xlink:to="loc_us-gaap_PlanNameDomain_d2f35363-1619-4255-a132-e8646e442d2a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_OmnibusEquityIncentivePlanMember_8f65394d-df42-419e-9c28-792d42295fc2" xlink:href="gti-20221231.xsd#gti_OmnibusEquityIncentivePlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_d2f35363-1619-4255-a132-e8646e442d2a" xlink:to="loc_gti_OmnibusEquityIncentivePlanMember_8f65394d-df42-419e-9c28-792d42295fc2" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_ca96d510-8d6c-4243-8b7e-d19555450741" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_ca96d510-8d6c-4243-8b7e-d19555450741" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_ca96d510-8d6c-4243-8b7e-d19555450741_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_ca96d510-8d6c-4243-8b7e-d19555450741" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_ca96d510-8d6c-4243-8b7e-d19555450741_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_395a7e1d-fa0a-40da-aa92-2b852302a7c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_ca96d510-8d6c-4243-8b7e-d19555450741" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_395a7e1d-fa0a-40da-aa92-2b852302a7c6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_98ab04c3-faa4-441c-9063-48629748c131" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_395a7e1d-fa0a-40da-aa92-2b852302a7c6" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_98ab04c3-faa4-441c-9063-48629748c131" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_a67d08c2-2d95-48b3-a9a0-7240204b46d9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:to="loc_srt_StatementScenarioAxis_a67d08c2-2d95-48b3-a9a0-7240204b46d9" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_a67d08c2-2d95-48b3-a9a0-7240204b46d9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_a67d08c2-2d95-48b3-a9a0-7240204b46d9" xlink:to="loc_srt_ScenarioUnspecifiedDomain_a67d08c2-2d95-48b3-a9a0-7240204b46d9_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_b70bd7b0-2433-45f4-aca5-38aa52899a7c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_a67d08c2-2d95-48b3-a9a0-7240204b46d9" xlink:to="loc_srt_ScenarioUnspecifiedDomain_b70bd7b0-2433-45f4-aca5-38aa52899a7c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioPlanMember_d0ccacc1-d2a4-4f9e-847c-17f9ef8fd1d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_b70bd7b0-2433-45f4-aca5-38aa52899a7c" xlink:to="loc_us-gaap_ScenarioPlanMember_d0ccacc1-d2a4-4f9e-847c-17f9ef8fd1d2" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioAdjustmentMember_45ec2e61-4ede-4e3d-a286-f1489db3aa06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioAdjustmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_b70bd7b0-2433-45f4-aca5-38aa52899a7c" xlink:to="loc_us-gaap_ScenarioAdjustmentMember_45ec2e61-4ede-4e3d-a286-f1489db3aa06" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_4e1894f9-53e4-41db-8720-511676e91287" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:to="loc_dei_LegalEntityAxis_4e1894f9-53e4-41db-8720-511676e91287" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4e1894f9-53e4-41db-8720-511676e91287_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_4e1894f9-53e4-41db-8720-511676e91287" xlink:to="loc_dei_EntityDomain_4e1894f9-53e4-41db-8720-511676e91287_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_598db714-8efb-4091-8ba9-86c8a401a791" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_4e1894f9-53e4-41db-8720-511676e91287" xlink:to="loc_dei_EntityDomain_598db714-8efb-4091-8ba9-86c8a401a791" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_BrookfieldMember_8eab625b-a7ec-4869-a308-650c9aa9d1c7" xlink:href="gti-20221231.xsd#gti_BrookfieldMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_598db714-8efb-4091-8ba9-86c8a401a791" xlink:to="loc_gti_BrookfieldMember_8eab625b-a7ec-4869-a308-650c9aa9d1c7" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_edc86c3f-6454-464a-9f41-4467282f6ea3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e18b828-a789-42e9-b6c0-31b7081dcdf9" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_edc86c3f-6454-464a-9f41-4467282f6ea3" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_edc86c3f-6454-464a-9f41-4467282f6ea3_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_edc86c3f-6454-464a-9f41-4467282f6ea3" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_edc86c3f-6454-464a-9f41-4467282f6ea3_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_f8903a6d-b1ca-466c-a196-21c8139563a0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_edc86c3f-6454-464a-9f41-4467282f6ea3" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_f8903a6d-b1ca-466c-a196-21c8139563a0" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GrafTechInternationalLtdMember_88fd0ee9-f14f-4485-a928-1fff1e3fe4e1" xlink:href="gti-20221231.xsd#gti_GrafTechInternationalLtdMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_f8903a6d-b1ca-466c-a196-21c8139563a0" xlink:to="loc_gti_GrafTechInternationalLtdMember_88fd0ee9-f14f-4485-a928-1fff1e3fe4e1" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails3" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationNarrativesDetails3"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails3" xlink:type="extended" id="icdff97b68fbc47f4a5019e735f53716a_StockBasedCompensationNarrativesDetails3">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_f145f5a8-9be9-49ee-bea4-427ecf3a78f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_f145f5a8-9be9-49ee-bea4-427ecf3a78f5" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_8dc2f8d5-8f7e-4cb4-94d8-c8c0b601ad14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_8dc2f8d5-8f7e-4cb4-94d8-c8c0b601ad14" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_9c36560a-2922-4af0-ab62-1581f73d8d27" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_9c36560a-2922-4af0-ab62-1581f73d8d27" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_facfb76b-06d8-43fa-bb2c-38a8bf345b77" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_facfb76b-06d8-43fa-bb2c-38a8bf345b77" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_54984c93-a8a4-47f9-ab10-a82a0c365604" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_ShareBasedCompensation_54984c93-a8a4-47f9-ab10-a82a0c365604" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_cc759367-73ac-4309-9e17-06d216aed6c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_cc759367-73ac-4309-9e17-06d216aed6c0" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_858d9b38-f8f6-4516-9141-4a3f8c761109" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_858d9b38-f8f6-4516-9141-4a3f8c761109" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_5a20f502-6665-4985-8354-23ed5d8f91fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_5a20f502-6665-4985-8354-23ed5d8f91fa" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_e02cf389-bdbc-4315-9024-3bfbb6b34a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_e02cf389-bdbc-4315-9024-3bfbb6b34a2a" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_5535e601-9d06-40ce-b160-4ae32f3f952b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_5535e601-9d06-40ce-b160-4ae32f3f952b" xlink:type="arc" order="9"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f64e5cd4-8639-4d99-a3e6-84b934523607" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e9715280-be81-4f12-b5ba-61b1180414a7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f64e5cd4-8639-4d99-a3e6-84b934523607" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e4e45bc5-df06-4920-a7d0-c46ac7c67b67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f64e5cd4-8639-4d99-a3e6-84b934523607" xlink:to="loc_us-gaap_AwardTypeAxis_e4e45bc5-df06-4920-a7d0-c46ac7c67b67" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e45bc5-df06-4920-a7d0-c46ac7c67b67_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e4e45bc5-df06-4920-a7d0-c46ac7c67b67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e45bc5-df06-4920-a7d0-c46ac7c67b67_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_217d7b0c-6fec-4e27-964e-25a492684be6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e4e45bc5-df06-4920-a7d0-c46ac7c67b67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_217d7b0c-6fec-4e27-964e-25a492684be6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_e2516c7c-8cdd-4aa6-b860-57626ba68441" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_217d7b0c-6fec-4e27-964e-25a492684be6" xlink:to="loc_us-gaap_EmployeeStockOptionMember_e2516c7c-8cdd-4aa6-b860-57626ba68441" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_a80c143c-3004-4b05-addb-45c3e5059223" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f64e5cd4-8639-4d99-a3e6-84b934523607" xlink:to="loc_srt_RangeAxis_a80c143c-3004-4b05-addb-45c3e5059223" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a80c143c-3004-4b05-addb-45c3e5059223_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_a80c143c-3004-4b05-addb-45c3e5059223" xlink:to="loc_srt_RangeMember_a80c143c-3004-4b05-addb-45c3e5059223_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_289013d7-e37d-4ff2-8bc0-48f08d337f71" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_a80c143c-3004-4b05-addb-45c3e5059223" xlink:to="loc_srt_RangeMember_289013d7-e37d-4ff2-8bc0-48f08d337f71" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4a987b59-bf7c-4130-8dcb-3f4661e51b94" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_289013d7-e37d-4ff2-8bc0-48f08d337f71" xlink:to="loc_srt_MinimumMember_4a987b59-bf7c-4130-8dcb-3f4661e51b94" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6ff7ac61-81e1-43ae-8e5a-87101106661a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_289013d7-e37d-4ff2-8bc0-48f08d337f71" xlink:to="loc_srt_MaximumMember_6ff7ac61-81e1-43ae-8e5a-87101106661a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_58138eff-c433-4fa3-b537-af099c0723da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f64e5cd4-8639-4d99-a3e6-84b934523607" xlink:to="loc_us-gaap_VestingAxis_58138eff-c433-4fa3-b537-af099c0723da" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_58138eff-c433-4fa3-b537-af099c0723da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_58138eff-c433-4fa3-b537-af099c0723da" xlink:to="loc_us-gaap_VestingDomain_58138eff-c433-4fa3-b537-af099c0723da_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_58138eff-c433-4fa3-b537-af099c0723da" xlink:to="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_a34550c4-e0d2-4404-a37a-baa04fbd7a59" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_a34550c4-e0d2-4404-a37a-baa04fbd7a59" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_8c696f89-f64d-4387-b0e5-b23f5a71f8e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_8c696f89-f64d-4387-b0e5-b23f5a71f8e4" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_46c51351-abf3-4dec-8415-bd586d8b1184" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_46c51351-abf3-4dec-8415-bd586d8b1184" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ShareBasedPaymentArrangementTrancheFourMember_be185ca6-9b8f-4361-a6e1-7897065f25d9" xlink:href="gti-20221231.xsd#gti_ShareBasedPaymentArrangementTrancheFourMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:to="loc_gti_ShareBasedPaymentArrangementTrancheFourMember_be185ca6-9b8f-4361-a6e1-7897065f25d9" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ShareBasedPaymentArrangementTrancheFiveMember_badf1df6-884b-4ec9-8e51-4cf5bfa7754a" xlink:href="gti-20221231.xsd#gti_ShareBasedPaymentArrangementTrancheFiveMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_adba569b-b716-44f8-a553-524b88b64ceb" xlink:to="loc_gti_ShareBasedPaymentArrangementTrancheFiveMember_badf1df6-884b-4ec9-8e51-4cf5bfa7754a" xlink:type="arc" order="4"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails4" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationNarrativesDetails4"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationNarrativesDetails4" xlink:type="extended" id="i0b5e0b10a33c47b4b5f27387f0cd517e_StockBasedCompensationNarrativesDetails4">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_48bd18ce-f4bd-4b63-abc0-6813365af33d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_48bd18ce-f4bd-4b63-abc0-6813365af33d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_43d20331-d257-441b-bd37-25e91e72f729" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_43d20331-d257-441b-bd37-25e91e72f729" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockExpense_8470d804-0451-4697-9c8c-0d5bc9bef0cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_RestrictedStockExpense_8470d804-0451-4697-9c8c-0d5bc9bef0cd" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_65c81b52-5fae-47e4-b711-481eb2983bae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_65c81b52-5fae-47e4-b711-481eb2983bae" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_970a91dc-da9e-4d24-8c4b-d3098de872a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_970a91dc-da9e-4d24-8c4b-d3098de872a0" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_3efb7369-5b12-4870-8a02-ce2fb771fd4a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_3efb7369-5b12-4870-8a02-ce2fb771fd4a" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6b921b3f-94dc-4748-b06f-2a9ab1688e13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6b921b3f-94dc-4748-b06f-2a9ab1688e13" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_af46dd4b-91fe-447d-8267-01c4f3beb0be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_af46dd4b-91fe-447d-8267-01c4f3beb0be" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_99349b63-9642-4265-90ea-0fefa4ab49c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_ShareBasedCompensation_99349b63-9642-4265-90ea-0fefa4ab49c0" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_467f2429-0ef7-496f-a6f9-9375c9b0ff47" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b23dccbd-8b9f-4645-9ee1-55bc9f4840db" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_467f2429-0ef7-496f-a6f9-9375c9b0ff47" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ba8eecad-f9b8-45ad-b295-549cecd7458f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_467f2429-0ef7-496f-a6f9-9375c9b0ff47" xlink:to="loc_us-gaap_AwardTypeAxis_ba8eecad-f9b8-45ad-b295-549cecd7458f" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ba8eecad-f9b8-45ad-b295-549cecd7458f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ba8eecad-f9b8-45ad-b295-549cecd7458f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ba8eecad-f9b8-45ad-b295-549cecd7458f_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e53c4c52-1df5-4149-98b8-24959dee06a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ba8eecad-f9b8-45ad-b295-549cecd7458f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e53c4c52-1df5-4149-98b8-24959dee06a2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_3bd2cafc-0059-4218-bf07-3ba14ecdc71e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e53c4c52-1df5-4149-98b8-24959dee06a2" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_3bd2cafc-0059-4218-bf07-3ba14ecdc71e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DeferredShareUnitsMember_b92f66b8-025a-4c79-810e-5eea9892458c" xlink:href="gti-20221231.xsd#gti_DeferredShareUnitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e53c4c52-1df5-4149-98b8-24959dee06a2" xlink:to="loc_gti_DeferredShareUnitsMember_b92f66b8-025a-4c79-810e-5eea9892458c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_16a6d049-a199-4272-be09-dd5ffeff1e44" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_467f2429-0ef7-496f-a6f9-9375c9b0ff47" xlink:to="loc_srt_TitleOfIndividualAxis_16a6d049-a199-4272-be09-dd5ffeff1e44" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_16a6d049-a199-4272-be09-dd5ffeff1e44_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_16a6d049-a199-4272-be09-dd5ffeff1e44" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_16a6d049-a199-4272-be09-dd5ffeff1e44_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_0ede6e22-963c-4f19-a00b-e22a714ef459" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_16a6d049-a199-4272-be09-dd5ffeff1e44" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_0ede6e22-963c-4f19-a00b-e22a714ef459" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_19bac305-a8e0-4ddb-a91a-8fd2b82de662" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_DirectorMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_0ede6e22-963c-4f19-a00b-e22a714ef459" xlink:to="loc_srt_DirectorMember_19bac305-a8e0-4ddb-a91a-8fd2b82de662" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_02f61e57-adae-49eb-b6af-afa6d98e2235" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_467f2429-0ef7-496f-a6f9-9375c9b0ff47" xlink:to="loc_us-gaap_VestingAxis_02f61e57-adae-49eb-b6af-afa6d98e2235" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_02f61e57-adae-49eb-b6af-afa6d98e2235_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_02f61e57-adae-49eb-b6af-afa6d98e2235" xlink:to="loc_us-gaap_VestingDomain_02f61e57-adae-49eb-b6af-afa6d98e2235_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_02f61e57-adae-49eb-b6af-afa6d98e2235" xlink:to="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_e37a94d4-ce70-4ea7-9b5f-edca17a4bfe0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_e37a94d4-ce70-4ea7-9b5f-edca17a4bfe0" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_964bea17-ec89-4eb1-88b4-aef0aac2810e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_964bea17-ec89-4eb1-88b4-aef0aac2810e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_fd6924db-7488-4a98-8489-766fd10efc6a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_fd6924db-7488-4a98-8489-766fd10efc6a" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ShareBasedPaymentArrangementTrancheFourMember_c9141de0-e026-4c04-bc8a-a5fde1b5d005" xlink:href="gti-20221231.xsd#gti_ShareBasedPaymentArrangementTrancheFourMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:to="loc_gti_ShareBasedPaymentArrangementTrancheFourMember_c9141de0-e026-4c04-bc8a-a5fde1b5d005" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ShareBasedPaymentArrangementTrancheFiveMember_e8eff4e7-fb7d-4853-826f-8dfd37c3c11d" xlink:href="gti-20221231.xsd#gti_ShareBasedPaymentArrangementTrancheFiveMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_169ac8de-63ec-45bb-ae4e-42f38187b29c" xlink:to="loc_gti_ShareBasedPaymentArrangementTrancheFiveMember_e8eff4e7-fb7d-4853-826f-8dfd37c3c11d" xlink:type="arc" order="4"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationValuationAssumptionsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationValuationAssumptionsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationValuationAssumptionsDetails" xlink:type="extended" id="i1f4e5b950ea5499e89af09b17b09665e_StockBasedCompensationValuationAssumptionsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_902baa13-b2a2-4725-afda-e03101906f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_902baa13-b2a2-4725-afda-e03101906f3d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_abe8b77c-fd3c-4cbb-8b09-8cf89e9a0360" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_abe8b77c-fd3c-4cbb-8b09-8cf89e9a0360" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_b4455094-d3e4-417b-8580-68a69f177468" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_b4455094-d3e4-417b-8580-68a69f177468" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_98b6e69f-cd75-4f9d-82bc-97710de339e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_98b6e69f-cd75-4f9d-82bc-97710de339e6" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_077dcd6f-5815-4e6e-87c8-fe610163cc27" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_077dcd6f-5815-4e6e-87c8-fe610163cc27" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1bf9639-1943-4c55-8e5f-cdcfc6349955" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0fe0d298-3b9a-4ed7-8750-74eb5549371d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1bf9639-1943-4c55-8e5f-cdcfc6349955" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_fe7f0ec4-2b93-4c90-bca6-0e8d1366e48c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1bf9639-1943-4c55-8e5f-cdcfc6349955" xlink:to="loc_srt_RangeAxis_fe7f0ec4-2b93-4c90-bca6-0e8d1366e48c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fe7f0ec4-2b93-4c90-bca6-0e8d1366e48c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_fe7f0ec4-2b93-4c90-bca6-0e8d1366e48c" xlink:to="loc_srt_RangeMember_fe7f0ec4-2b93-4c90-bca6-0e8d1366e48c_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f5b13245-b4f0-4ed7-9668-da3dad672f9b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_fe7f0ec4-2b93-4c90-bca6-0e8d1366e48c" xlink:to="loc_srt_RangeMember_f5b13245-b4f0-4ed7-9668-da3dad672f9b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_04099242-710b-459d-8e6c-654bee0f9990" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f5b13245-b4f0-4ed7-9668-da3dad672f9b" xlink:to="loc_srt_MinimumMember_04099242-710b-459d-8e6c-654bee0f9990" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ad63883b-5b1c-4e12-86fd-46a7bebe40ae" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f5b13245-b4f0-4ed7-9668-da3dad672f9b" xlink:to="loc_srt_MaximumMember_ad63883b-5b1c-4e12-86fd-46a7bebe40ae" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_1e5ad8af-a4a5-4792-9294-1d0426ebed11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1bf9639-1943-4c55-8e5f-cdcfc6349955" xlink:to="loc_us-gaap_AwardTypeAxis_1e5ad8af-a4a5-4792-9294-1d0426ebed11" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1e5ad8af-a4a5-4792-9294-1d0426ebed11_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1e5ad8af-a4a5-4792-9294-1d0426ebed11" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1e5ad8af-a4a5-4792-9294-1d0426ebed11_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1d1768a-eb56-4f9e-9601-4488e67bb640" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1e5ad8af-a4a5-4792-9294-1d0426ebed11" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1d1768a-eb56-4f9e-9601-4488e67bb640" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_e9b77a0c-9959-46c4-954d-5f45236c4a6f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1d1768a-eb56-4f9e-9601-4488e67bb640" xlink:to="loc_us-gaap_EmployeeStockOptionMember_e9b77a0c-9959-46c4-954d-5f45236c4a6f" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationRestrictedStockUnitsRollforwardDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationRestrictedStockUnitsRollforwardDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationRestrictedStockUnitsRollforwardDetails" xlink:type="extended" id="i861d0054dc404b668bc68e0632e22d8b_StockBasedCompensationRestrictedStockUnitsRollforwardDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_974d18b2-36d8-4af0-8e05-87e7715585a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3dc9914b-6367-4c6f-8ed2-e331bd59aa30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_974d18b2-36d8-4af0-8e05-87e7715585a0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3dc9914b-6367-4c6f-8ed2-e331bd59aa30" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b7893468-34d1-40fb-aa41-a18e7deca41e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3dc9914b-6367-4c6f-8ed2-e331bd59aa30" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b7893468-34d1-40fb-aa41-a18e7deca41e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_fdafbfd3-7f5d-41f0-a8a0-701a217a47ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3dc9914b-6367-4c6f-8ed2-e331bd59aa30" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_fdafbfd3-7f5d-41f0-a8a0-701a217a47ec" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1cd0aa2b-a9e9-46c3-8232-5be729da166c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3dc9914b-6367-4c6f-8ed2-e331bd59aa30" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1cd0aa2b-a9e9-46c3-8232-5be729da166c" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_f8946373-c502-4b1a-aa4d-90881e0a34b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3dc9914b-6367-4c6f-8ed2-e331bd59aa30" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_f8946373-c502-4b1a-aa4d-90881e0a34b9" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b439d32b-2d77-41c1-8344-197a2056cae3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3571609a-393c-4557-a72e-f467c41270b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_974d18b2-36d8-4af0-8e05-87e7715585a0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3571609a-393c-4557-a72e-f467c41270b5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_4f3a2c0c-74d7-4456-b04d-64e837a8ddd8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3571609a-393c-4557-a72e-f467c41270b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_4f3a2c0c-74d7-4456-b04d-64e837a8ddd8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e600ed53-fa4f-4469-9d51-3d924b13d72d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3571609a-393c-4557-a72e-f467c41270b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e600ed53-fa4f-4469-9d51-3d924b13d72d" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b787e558-87f1-45ae-915d-53998e76e1b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3571609a-393c-4557-a72e-f467c41270b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b787e558-87f1-45ae-915d-53998e76e1b4" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_85debcaa-2669-4367-b3d9-9178b1aa5900" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3571609a-393c-4557-a72e-f467c41270b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_85debcaa-2669-4367-b3d9-9178b1aa5900" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_f45580f2-d989-49f4-ac82-904fcf3f39eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c410fce3-304c-4453-ade5-d890f866b055" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_974d18b2-36d8-4af0-8e05-87e7715585a0" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c410fce3-304c-4453-ade5-d890f866b055" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_4297a211-314a-4d4a-9e43-c7ff431d5af7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c410fce3-304c-4453-ade5-d890f866b055" xlink:to="loc_us-gaap_AwardTypeAxis_4297a211-314a-4d4a-9e43-c7ff431d5af7" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4297a211-314a-4d4a-9e43-c7ff431d5af7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_4297a211-314a-4d4a-9e43-c7ff431d5af7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4297a211-314a-4d4a-9e43-c7ff431d5af7_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0f1185f1-e0fe-4d0b-bb97-797547774ab0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_4297a211-314a-4d4a-9e43-c7ff431d5af7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0f1185f1-e0fe-4d0b-bb97-797547774ab0" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_79afcce8-489d-415e-a2e5-4792df73acbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0f1185f1-e0fe-4d0b-bb97-797547774ab0" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_79afcce8-489d-415e-a2e5-4792df73acbe" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockBasedCompensationSharesAuthorizedforDistributionDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#StockBasedCompensationSharesAuthorizedforDistributionDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockBasedCompensationSharesAuthorizedforDistributionDetails" xlink:type="extended" id="ifce06189597449adbe477656ac28208a_StockBasedCompensationSharesAuthorizedforDistributionDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_636c0790-d259-4c6e-a1c9-960b32c5de50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_435b3978-088d-4816-a460-9371c832750e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_636c0790-d259-4c6e-a1c9-960b32c5de50" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_435b3978-088d-4816-a460-9371c832750e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_636c0790-d259-4c6e-a1c9-960b32c5de50" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_739c51bf-91be-490a-8b49-59f6c2254475" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:to="loc_us-gaap_PlanNameAxis_739c51bf-91be-490a-8b49-59f6c2254475" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_739c51bf-91be-490a-8b49-59f6c2254475_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_739c51bf-91be-490a-8b49-59f6c2254475" xlink:to="loc_us-gaap_PlanNameDomain_739c51bf-91be-490a-8b49-59f6c2254475_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d1c98a7c-8bc9-47e3-9c15-9983d3b2a0b6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_739c51bf-91be-490a-8b49-59f6c2254475" xlink:to="loc_us-gaap_PlanNameDomain_d1c98a7c-8bc9-47e3-9c15-9983d3b2a0b6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_4ea7af0c-d3b6-4ced-8a96-26551d6c1254" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:to="loc_us-gaap_AwardDateAxis_4ea7af0c-d3b6-4ced-8a96-26551d6c1254" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_4ea7af0c-d3b6-4ced-8a96-26551d6c1254_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_4ea7af0c-d3b6-4ced-8a96-26551d6c1254" xlink:to="loc_us-gaap_AwardDateDomain_4ea7af0c-d3b6-4ced-8a96-26551d6c1254_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_343223bd-4a98-454d-97e2-3fd07a33f8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_4ea7af0c-d3b6-4ced-8a96-26551d6c1254" xlink:to="loc_us-gaap_AwardDateDomain_343223bd-4a98-454d-97e2-3fd07a33f8b3" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_9d20db3d-17f9-479f-91fd-2a04912f2c14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:to="loc_us-gaap_AwardTypeAxis_9d20db3d-17f9-479f-91fd-2a04912f2c14" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d20db3d-17f9-479f-91fd-2a04912f2c14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9d20db3d-17f9-479f-91fd-2a04912f2c14" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d20db3d-17f9-479f-91fd-2a04912f2c14_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38151785-2ef5-4c6f-8c65-8a4d878c4b31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9d20db3d-17f9-479f-91fd-2a04912f2c14" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38151785-2ef5-4c6f-8c65-8a4d878c4b31" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_0f86d693-f491-400b-bdda-ac166e598283" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38151785-2ef5-4c6f-8c65-8a4d878c4b31" xlink:to="loc_us-gaap_EmployeeStockOptionMember_0f86d693-f491-400b-bdda-ac166e598283" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_a73a733b-6e5d-45f8-b0f9-95e532acdd8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38151785-2ef5-4c6f-8c65-8a4d878c4b31" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_a73a733b-6e5d-45f8-b0f9-95e532acdd8b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_d988b7e7-38fb-4f8e-a05d-799761b9df19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_d988b7e7-38fb-4f8e-a05d-799761b9df19" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_d988b7e7-38fb-4f8e-a05d-799761b9df19_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_d988b7e7-38fb-4f8e-a05d-799761b9df19" xlink:to="loc_us-gaap_ClassOfStockDomain_d988b7e7-38fb-4f8e-a05d-799761b9df19_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_ac67e1fe-f97e-4617-a165-feec97ef289e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_d988b7e7-38fb-4f8e-a05d-799761b9df19" xlink:to="loc_us-gaap_ClassOfStockDomain_ac67e1fe-f97e-4617-a165-feec97ef289e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6400d00b-769b-4361-adb4-94d4df48e15e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:to="loc_srt_RangeAxis_6400d00b-769b-4361-adb4-94d4df48e15e" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6400d00b-769b-4361-adb4-94d4df48e15e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6400d00b-769b-4361-adb4-94d4df48e15e" xlink:to="loc_srt_RangeMember_6400d00b-769b-4361-adb4-94d4df48e15e_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0cf9accc-104d-4055-933a-0538bbb63bf5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6400d00b-769b-4361-adb4-94d4df48e15e" xlink:to="loc_srt_RangeMember_0cf9accc-104d-4055-933a-0538bbb63bf5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_8ce77416-283a-4e14-bf66-04eab047213b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74139eb0-1c27-4afe-b18b-21724e7fda5e" xlink:to="loc_us-gaap_VestingAxis_8ce77416-283a-4e14-bf66-04eab047213b" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_8ce77416-283a-4e14-bf66-04eab047213b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_8ce77416-283a-4e14-bf66-04eab047213b" xlink:to="loc_us-gaap_VestingDomain_8ce77416-283a-4e14-bf66-04eab047213b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_32a390bb-a737-4498-8068-f6b8a2a21a37" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_8ce77416-283a-4e14-bf66-04eab047213b" xlink:to="loc_us-gaap_VestingDomain_32a390bb-a737-4498-8068-f6b8a2a21a37" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/SegmentReportingScheduleOfFinancialInformationConcerningReportableSegmentsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#SegmentReportingScheduleOfFinancialInformationConcerningReportableSegmentsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/SegmentReportingScheduleOfFinancialInformationConcerningReportableSegmentsDetails" xlink:type="extended" id="i94b09d11643240cbaedefa3de09f0bd9_SegmentReportingScheduleOfFinancialInformationConcerningReportableSegmentsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_26ae813f-5319-4955-a3bc-a691922c088e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_10c36331-ee8c-4287-a7aa-a95460419759" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_26ae813f-5319-4955-a3bc-a691922c088e" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_10c36331-ee8c-4287-a7aa-a95460419759" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f2f529b5-b08f-485c-8e36-8050f6dfd4fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_26ae813f-5319-4955-a3bc-a691922c088e" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f2f529b5-b08f-485c-8e36-8050f6dfd4fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_86eb089d-e441-4997-bac8-17c23ed55daf" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f2f529b5-b08f-485c-8e36-8050f6dfd4fe" xlink:to="loc_srt_ProductOrServiceAxis_86eb089d-e441-4997-bac8-17c23ed55daf" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_86eb089d-e441-4997-bac8-17c23ed55daf_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_86eb089d-e441-4997-bac8-17c23ed55daf" xlink:to="loc_srt_ProductsAndServicesDomain_86eb089d-e441-4997-bac8-17c23ed55daf_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8b7529ff-ca10-4665-892f-a45c1f3bfdc9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_86eb089d-e441-4997-bac8-17c23ed55daf" xlink:to="loc_srt_ProductsAndServicesDomain_8b7529ff-ca10-4665-892f-a45c1f3bfdc9" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GraphiteElectrodesMember_c1038f53-0007-468f-b8dd-b5b2cdb1317b" xlink:href="gti-20221231.xsd#gti_GraphiteElectrodesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8b7529ff-ca10-4665-892f-a45c1f3bfdc9" xlink:to="loc_gti_GraphiteElectrodesMember_c1038f53-0007-468f-b8dd-b5b2cdb1317b" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_3d2afc26-b025-4a8d-ad07-518586d43b8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f2f529b5-b08f-485c-8e36-8050f6dfd4fe" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_3d2afc26-b025-4a8d-ad07-518586d43b8b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_3d2afc26-b025-4a8d-ad07-518586d43b8b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_3d2afc26-b025-4a8d-ad07-518586d43b8b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_3d2afc26-b025-4a8d-ad07-518586d43b8b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_672c1b63-922d-4cc6-ae7c-3499f6e170e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_3d2afc26-b025-4a8d-ad07-518586d43b8b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_672c1b63-922d-4cc6-ae7c-3499f6e170e2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_b6ff960a-767f-4d3d-bb10-660403592fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductConcentrationRiskMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_672c1b63-922d-4cc6-ae7c-3499f6e170e2" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_b6ff960a-767f-4d3d-bb10-660403592fa0" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_bb4c502e-1319-4acb-8df2-d4aa2ab15083" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f2f529b5-b08f-485c-8e36-8050f6dfd4fe" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_bb4c502e-1319-4acb-8df2-d4aa2ab15083" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_bb4c502e-1319-4acb-8df2-d4aa2ab15083_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_bb4c502e-1319-4acb-8df2-d4aa2ab15083" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_bb4c502e-1319-4acb-8df2-d4aa2ab15083_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4991ea65-e796-40d5-a53c-a020fc2ce7de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_bb4c502e-1319-4acb-8df2-d4aa2ab15083" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4991ea65-e796-40d5-a53c-a020fc2ce7de" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_b99b35c7-46ae-49ec-9fb9-55d9fd96e0d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4991ea65-e796-40d5-a53c-a020fc2ce7de" xlink:to="loc_us-gaap_SalesRevenueNetMember_b99b35c7-46ae-49ec-9fb9-55d9fd96e0d0" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/SegmentReportingRevenuefromExternalCustomersbyProductsandServicesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#SegmentReportingRevenuefromExternalCustomersbyProductsandServicesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/SegmentReportingRevenuefromExternalCustomersbyProductsandServicesDetails" xlink:type="extended" id="ib16dc000fd004ea1ab48e3a8ea556cf4_SegmentReportingRevenuefromExternalCustomersbyProductsandServicesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_66eb87a6-205e-4fe0-8839-906524851229" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d4639326-9066-49cf-bc42-d0505c40f37b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_66eb87a6-205e-4fe0-8839-906524851229" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d4639326-9066-49cf-bc42-d0505c40f37b" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_4d6f4272-88a6-437b-91e7-7711e6a653f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_66eb87a6-205e-4fe0-8839-906524851229" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_4d6f4272-88a6-437b-91e7-7711e6a653f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_48e22539-3c3d-4dc9-9cf9-3d81387e987b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_4d6f4272-88a6-437b-91e7-7711e6a653f5" xlink:to="loc_srt_StatementGeographicalAxis_48e22539-3c3d-4dc9-9cf9-3d81387e987b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_48e22539-3c3d-4dc9-9cf9-3d81387e987b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_48e22539-3c3d-4dc9-9cf9-3d81387e987b" xlink:to="loc_srt_SegmentGeographicalDomain_48e22539-3c3d-4dc9-9cf9-3d81387e987b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_bb88babb-5176-4295-aef0-e5368d4cfa02" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_48e22539-3c3d-4dc9-9cf9-3d81387e987b" xlink:to="loc_srt_SegmentGeographicalDomain_bb88babb-5176-4295-aef0-e5368d4cfa02" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_6dba5e1e-017f-4a21-8ec4-a4d999d4b6c7" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb88babb-5176-4295-aef0-e5368d4cfa02" xlink:to="loc_country_US_6dba5e1e-017f-4a21-8ec4-a4d999d4b6c7" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_a1e9c5c7-0b57-445c-9c7d-3d07aa026c51" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_AmericasMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb88babb-5176-4295-aef0-e5368d4cfa02" xlink:to="loc_srt_AmericasMember_a1e9c5c7-0b57-445c-9c7d-3d07aa026c51" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_dceee901-6ee2-4c50-976f-5bda07849a4a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_AsiaPacificMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb88babb-5176-4295-aef0-e5368d4cfa02" xlink:to="loc_srt_AsiaPacificMember_dceee901-6ee2-4c50-976f-5bda07849a4a" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_EuropeMiddleEastAfricaMember_578d58bb-120e-47a1-a9e4-2cfc6d236ba6" xlink:href="gti-20221231.xsd#gti_EuropeMiddleEastAfricaMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb88babb-5176-4295-aef0-e5368d4cfa02" xlink:to="loc_gti_EuropeMiddleEastAfricaMember_578d58bb-120e-47a1-a9e4-2cfc6d236ba6" xlink:type="arc" order="3"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/SegmentReportingSummaryOfInformationOfLongLivedAssetsInDifferentGeographicAreasDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#SegmentReportingSummaryOfInformationOfLongLivedAssetsInDifferentGeographicAreasDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/SegmentReportingSummaryOfInformationOfLongLivedAssetsInDifferentGeographicAreasDetails" xlink:type="extended" id="i2926057d9bd94222ab5aa50fc9660628_SegmentReportingSummaryOfInformationOfLongLivedAssetsInDifferentGeographicAreasDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_81349ffb-a665-4607-a350-4d3891759cfd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_441d1b63-700a-4ebf-9709-1724e40cb5d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_81349ffb-a665-4607-a350-4d3891759cfd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_441d1b63-700a-4ebf-9709-1724e40cb5d2" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_72e46e46-0818-4562-ab23-d2eaea5a8bfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_81349ffb-a665-4607-a350-4d3891759cfd" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_72e46e46-0818-4562-ab23-d2eaea5a8bfb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_c1647203-4ac7-4cef-94cb-6a3dc7ce7a47" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_72e46e46-0818-4562-ab23-d2eaea5a8bfb" xlink:to="loc_srt_StatementGeographicalAxis_c1647203-4ac7-4cef-94cb-6a3dc7ce7a47" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_c1647203-4ac7-4cef-94cb-6a3dc7ce7a47_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_c1647203-4ac7-4cef-94cb-6a3dc7ce7a47" xlink:to="loc_srt_SegmentGeographicalDomain_c1647203-4ac7-4cef-94cb-6a3dc7ce7a47_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_c1647203-4ac7-4cef-94cb-6a3dc7ce7a47" xlink:to="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_f483c197-7f7c-4183-b46b-89ac6e033e42" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:to="loc_country_US_f483c197-7f7c-4183-b46b-89ac6e033e42" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_MX_a07ebb80-1880-4bc2-8038-e8e660f243d8" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_MX"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:to="loc_country_MX_a07ebb80-1880-4bc2-8038-e8e660f243d8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_country_BR_a083611a-ba33-44e6-90a1-9540d16b9913" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_BR"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:to="loc_country_BR_a083611a-ba33-44e6-90a1-9540d16b9913" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_country_FR_a32e6e57-453c-427f-9402-3616e93a75f8" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_FR"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:to="loc_country_FR_a32e6e57-453c-427f-9402-3616e93a75f8" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_country_ES_5d1fd8c0-22af-427d-8a13-972fd29651ad" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_ES"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:to="loc_country_ES_5d1fd8c0-22af-427d-8a13-972fd29651ad" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_OtherCountriesMember_66543536-2170-4911-9389-90d2d53ff012" xlink:href="gti-20221231.xsd#gti_OtherCountriesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_49982b94-cb05-458a-b3eb-4e00d80401b3" xlink:to="loc_gti_OtherCountriesMember_66543536-2170-4911-9389-90d2d53ff012" xlink:type="arc" order="5"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/DebtAndLiquidityScheduleOfLongTermDebtDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#DebtAndLiquidityScheduleOfLongTermDebtDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/DebtAndLiquidityScheduleOfLongTermDebtDetails" xlink:type="extended" id="i1def2821a094477280de98170a1951a5_DebtAndLiquidityScheduleOfLongTermDebtDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_4eaec2a4-5eb1-44b5-8e77-fba0b32e0d85" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_4eaec2a4-5eb1-44b5-8e77-fba0b32e0d85" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_7051a142-4abb-4d2b-a57f-fbbdbf15da0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_7051a142-4abb-4d2b-a57f-fbbdbf15da0b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_e7e11116-0234-41ec-89c1-e1f0fae557b6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:to="loc_us-gaap_LongTermDebt_e7e11116-0234-41ec-89c1-e1f0fae557b6" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_60ef95b9-bb75-40d9-816a-75db79c2327f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:to="loc_us-gaap_LongTermDebtCurrent_60ef95b9-bb75-40d9-816a-75db79c2327f" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_de416af8-2b76-4247-9582-3c387689ad94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_de416af8-2b76-4247-9582-3c387689ad94" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3809f404-02e3-4682-956a-7fbbb3cb5990" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bb62fe7b-18d0-499b-a1e2-cf9922790654" xlink:to="loc_us-gaap_DebtInstrumentTable_3809f404-02e3-4682-956a-7fbbb3cb5990" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_5bdbf5e3-fbd1-42b7-84bb-91ad3fc4e673" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3809f404-02e3-4682-956a-7fbbb3cb5990" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5bdbf5e3-fbd1-42b7-84bb-91ad3fc4e673" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5bdbf5e3-fbd1-42b7-84bb-91ad3fc4e673_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5bdbf5e3-fbd1-42b7-84bb-91ad3fc4e673" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5bdbf5e3-fbd1-42b7-84bb-91ad3fc4e673_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_83609293-339c-4968-86bb-a17c1584a4d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5bdbf5e3-fbd1-42b7-84bb-91ad3fc4e673" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_83609293-339c-4968-86bb-a17c1584a4d2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_TermLoanFacilityMember_aea909dd-c817-4da4-b97f-301208a2c444" xlink:href="gti-20221231.xsd#gti_TermLoanFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_83609293-339c-4968-86bb-a17c1584a4d2" xlink:to="loc_gti_TermLoanFacilityMember_aea909dd-c817-4da4-b97f-301208a2c444" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_2895124b-f4de-4a0e-9142-ea8f99e04cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_83609293-339c-4968-86bb-a17c1584a4d2" xlink:to="loc_us-gaap_SecuredDebtMember_2895124b-f4de-4a0e-9142-ea8f99e04cbf" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_1be1dad7-f468-48ed-ba91-18da3b341041" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherDebtSecuritiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_83609293-339c-4968-86bb-a17c1584a4d2" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_1be1dad7-f468-48ed-ba91-18da3b341041" xlink:type="arc" order="2"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/DebtAndLiquidity2018TermLoanand2018RevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#DebtAndLiquidity2018TermLoanand2018RevolvingCreditFacilityDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/DebtAndLiquidity2018TermLoanand2018RevolvingCreditFacilityDetails" xlink:type="extended" id="i96a9d642c775468ab0ccbf6e6717f33c_DebtAndLiquidity2018TermLoanand2018RevolvingCreditFacilityDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_bbece158-3a61-45cc-bf4a-a7f3c457097e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_bbece158-3a61-45cc-bf4a-a7f3c457097e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_IncreaseInBorrowingCapacity_4e61a2bb-5bca-4b77-8cbd-8a1ff14181ad" xlink:href="gti-20221231.xsd#gti_IncreaseInBorrowingCapacity"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_IncreaseInBorrowingCapacity_4e61a2bb-5bca-4b77-8cbd-8a1ff14181ad" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_000d710f-3559-4f4c-946e-0cc580c185c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_us-gaap_LineOfCredit_000d710f-3559-4f4c-946e-0cc580c185c9" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_eb80fa11-fac0-4733-b4b4-8a7c06b14e1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_eb80fa11-fac0-4733-b4b4-8a7c06b14e1e" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2f4a15fc-8d6e-4312-b701-7847531bd308" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2f4a15fc-8d6e-4312-b701-7847531bd308" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecrease_7f71a63a-9bec-45a3-85dc-5d0284468e18" xlink:href="gti-20221231.xsd#gti_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecrease"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecrease_7f71a63a-9bec-45a3-85dc-5d0284468e18" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings_3b426f4d-e53d-4448-bac2-6456759f60db" xlink:href="gti-20221231.xsd#gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings_3b426f4d-e53d-4448-bac2-6456759f60db" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentVariableRate_705ac803-6aa6-41cf-b7a4-1447c9a8b7e1" xlink:href="gti-20221231.xsd#gti_DebtInstrumentVariableRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_DebtInstrumentVariableRate_705ac803-6aa6-41cf-b7a4-1447c9a8b7e1" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_EquityInterestPledge_9cd0b714-f231-4813-a16d-b39b6eeb8320" xlink:href="gti-20221231.xsd#gti_EquityInterestPledge"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_EquityInterestPledge_9cd0b714-f231-4813-a16d-b39b6eeb8320" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentAnnualAmortizationRateAmount_17848e79-8ea4-4f8c-bf51-6ee5f73cceb3" xlink:href="gti-20221231.xsd#gti_DebtInstrumentAnnualAmortizationRateAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_DebtInstrumentAnnualAmortizationRateAmount_17848e79-8ea4-4f8c-bf51-6ee5f73cceb3" xlink:type="arc" order="9"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_RepaymentOfExcessCashflowPercentage_c4f919f3-65b3-4b6c-87cc-3116e7ad3421" xlink:href="gti-20221231.xsd#gti_RepaymentOfExcessCashflowPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_gti_RepaymentOfExcessCashflowPercentage_c4f919f3-65b3-4b6c-87cc-3116e7ad3421" xlink:type="arc" order="10"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RatioOfIndebtednessToNetCapital1_1ca7ec23-201e-4f55-a52d-a2ab2003b9f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RatioOfIndebtednessToNetCapital1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_us-gaap_RatioOfIndebtednessToNetCapital1_1ca7ec23-201e-4f55-a52d-a2ab2003b9f6" xlink:type="arc" order="11"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_906a51f2-2869-4b22-aed4-4912577d711e" xlink:to="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_d2da4929-dd7e-495c-9863-373e1c100e43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:to="loc_us-gaap_CreditFacilityAxis_d2da4929-dd7e-495c-9863-373e1c100e43" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d2da4929-dd7e-495c-9863-373e1c100e43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_d2da4929-dd7e-495c-9863-373e1c100e43" xlink:to="loc_us-gaap_CreditFacilityDomain_d2da4929-dd7e-495c-9863-373e1c100e43_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_daf43790-bcd4-43aa-a75e-0aacc5834290" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_d2da4929-dd7e-495c-9863-373e1c100e43" xlink:to="loc_us-gaap_CreditFacilityDomain_daf43790-bcd4-43aa-a75e-0aacc5834290" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_83ef8145-500d-4714-9ae3-c0d490711f22" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_daf43790-bcd4-43aa-a75e-0aacc5834290" xlink:to="loc_us-gaap_LineOfCreditMember_83ef8145-500d-4714-9ae3-c0d490711f22" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_f9693afb-d3b9-405c-a176-214b51eceecb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_daf43790-bcd4-43aa-a75e-0aacc5834290" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_f9693afb-d3b9-405c-a176-214b51eceecb" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1afc1f58-666b-4227-b254-c89268971b94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:to="loc_us-gaap_DebtInstrumentAxis_1afc1f58-666b-4227-b254-c89268971b94" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1afc1f58-666b-4227-b254-c89268971b94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1afc1f58-666b-4227-b254-c89268971b94" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1afc1f58-666b-4227-b254-c89268971b94_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_47ccc184-2593-4607-8fe4-12fca6b8c98c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1afc1f58-666b-4227-b254-c89268971b94" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_47ccc184-2593-4607-8fe4-12fca6b8c98c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_A2018CreditAgreementMember_ac100ed3-0d1e-464b-8049-3e2d62eab43c" xlink:href="gti-20221231.xsd#gti_A2018CreditAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47ccc184-2593-4607-8fe4-12fca6b8c98c" xlink:to="loc_gti_A2018CreditAgreementMember_ac100ed3-0d1e-464b-8049-3e2d62eab43c" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_TermLoanFacilityMember_8b196617-c9d2-42d3-a204-d697a35e7893" xlink:href="gti-20221231.xsd#gti_TermLoanFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47ccc184-2593-4607-8fe4-12fca6b8c98c" xlink:to="loc_gti_TermLoanFacilityMember_8b196617-c9d2-42d3-a204-d697a35e7893" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_6380edb6-ff00-421d-aabd-72ff57cdc591" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:to="loc_us-gaap_VariableRateAxis_6380edb6-ff00-421d-aabd-72ff57cdc591" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_6380edb6-ff00-421d-aabd-72ff57cdc591_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_6380edb6-ff00-421d-aabd-72ff57cdc591" xlink:to="loc_us-gaap_VariableRateDomain_6380edb6-ff00-421d-aabd-72ff57cdc591_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_36dac97a-0f23-4646-834e-eca7ed131950" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_6380edb6-ff00-421d-aabd-72ff57cdc591" xlink:to="loc_us-gaap_VariableRateDomain_36dac97a-0f23-4646-834e-eca7ed131950" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_AdjustedLIBORateMember_62bcda3f-6814-4b3a-b3a5-8617c59ff5be" xlink:href="gti-20221231.xsd#gti_AdjustedLIBORateMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_36dac97a-0f23-4646-834e-eca7ed131950" xlink:to="loc_gti_AdjustedLIBORateMember_62bcda3f-6814-4b3a-b3a5-8617c59ff5be" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ABRMember_7e60381f-a111-4b46-a0c4-bb68ba499446" xlink:href="gti-20221231.xsd#gti_ABRMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_36dac97a-0f23-4646-834e-eca7ed131950" xlink:to="loc_gti_ABRMember_7e60381f-a111-4b46-a0c4-bb68ba499446" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_a3f280a2-367c-4ed6-b45a-b4d36c52f750" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_36dac97a-0f23-4646-834e-eca7ed131950" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_a3f280a2-367c-4ed6-b45a-b4d36c52f750" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e39ec3ae-9d88-467c-803d-e05d6be2bb6a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:to="loc_srt_RangeAxis_e39ec3ae-9d88-467c-803d-e05d6be2bb6a" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e39ec3ae-9d88-467c-803d-e05d6be2bb6a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e39ec3ae-9d88-467c-803d-e05d6be2bb6a" xlink:to="loc_srt_RangeMember_e39ec3ae-9d88-467c-803d-e05d6be2bb6a_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2432ff75-ec93-4575-97b4-12cb6e3c7142" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e39ec3ae-9d88-467c-803d-e05d6be2bb6a" xlink:to="loc_srt_RangeMember_2432ff75-ec93-4575-97b4-12cb6e3c7142" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_29455eb6-0ccd-49d8-8ebb-6cef5c0cfe6d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2432ff75-ec93-4575-97b4-12cb6e3c7142" xlink:to="loc_srt_MinimumMember_29455eb6-0ccd-49d8-8ebb-6cef5c0cfe6d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_af09afb9-fa5e-43ac-844f-9dc381593c96" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2432ff75-ec93-4575-97b4-12cb6e3c7142" xlink:to="loc_srt_MaximumMember_af09afb9-fa5e-43ac-844f-9dc381593c96" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ContingentEventAxis_94ea8eb7-c196-459a-8206-a278331b0f93" xlink:href="gti-20221231.xsd#gti_ContingentEventAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f3be2539-9431-4b2d-ae20-84362103eb6b" xlink:to="loc_gti_ContingentEventAxis_94ea8eb7-c196-459a-8206-a278331b0f93" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ContingentEventDomain_94ea8eb7-c196-459a-8206-a278331b0f93_default" xlink:href="gti-20221231.xsd#gti_ContingentEventDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gti_ContingentEventAxis_94ea8eb7-c196-459a-8206-a278331b0f93" xlink:to="loc_gti_ContingentEventDomain_94ea8eb7-c196-459a-8206-a278331b0f93_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ContingentEventDomain_543d9e07-1017-4ca8-ba76-7d695739df0c" xlink:href="gti-20221231.xsd#gti_ContingentEventDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gti_ContingentEventAxis_94ea8eb7-c196-459a-8206-a278331b0f93" xlink:to="loc_gti_ContingentEventDomain_543d9e07-1017-4ca8-ba76-7d695739df0c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ContingentEventOneMember_1eb01a2f-e884-4af2-b1b6-5d0ec493df4d" xlink:href="gti-20221231.xsd#gti_ContingentEventOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gti_ContingentEventDomain_543d9e07-1017-4ca8-ba76-7d695739df0c" xlink:to="loc_gti_ContingentEventOneMember_1eb01a2f-e884-4af2-b1b6-5d0ec493df4d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ContingentEventTwoMember_c619e431-7c5a-4363-854a-28b355d3632e" xlink:href="gti-20221231.xsd#gti_ContingentEventTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gti_ContingentEventDomain_543d9e07-1017-4ca8-ba76-7d695739df0c" xlink:to="loc_gti_ContingentEventTwoMember_c619e431-7c5a-4363-854a-28b355d3632e" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/DebtAndLiquidity2018CreditFacilityRevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#DebtAndLiquidity2018CreditFacilityRevolvingCreditFacilityDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/DebtAndLiquidity2018CreditFacilityRevolvingCreditFacilityDetails" xlink:type="extended" id="i3ac37f3728aa4915a88aedeabb773237_DebtAndLiquidity2018CreditFacilityRevolvingCreditFacilityDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3918e941-dc2a-44fe-943e-dbc0aef0e30a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3918e941-dc2a-44fe-943e-dbc0aef0e30a" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_64846dec-8698-49c2-9836-c730ced6d6f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_us-gaap_LineOfCredit_64846dec-8698-49c2-9836-c730ced6d6f8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_64a9d80c-4d44-429d-8560-cfe63ee5dcfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_64a9d80c-4d44-429d-8560-cfe63ee5dcfb" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9d8ee647-3553-4eb9-83b4-7e4982fa3e99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9d8ee647-3553-4eb9-83b4-7e4982fa3e99" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_d6df8b6e-6755-450b-9f95-4333adcb539a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_d6df8b6e-6755-450b-9f95-4333adcb539a" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_BorrowingThreshold_a9039543-3397-42b3-847b-9aa30090b0a9" xlink:href="gti-20221231.xsd#gti_BorrowingThreshold"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_gti_BorrowingThreshold_a9039543-3397-42b3-847b-9aa30090b0a9" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_BorrowingThresholdPercentage_422ba010-51cb-4623-bd5b-419d5594b215" xlink:href="gti-20221231.xsd#gti_BorrowingThresholdPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_gti_BorrowingThresholdPercentage_422ba010-51cb-4623-bd5b-419d5594b215" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings_dc9323c7-a12e-4d3b-9c14-cf15207346ed" xlink:href="gti-20221231.xsd#gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings_dc9323c7-a12e-4d3b-9c14-cf15207346ed" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f0a3ced6-c39e-47e6-bd95-6a71cc6df60a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7dce0a87-6ac6-4bc0-83c2-d4404a146c7b" xlink:to="loc_us-gaap_DebtInstrumentTable_f0a3ced6-c39e-47e6-bd95-6a71cc6df60a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_11b925a8-82d7-48aa-aeb2-9886c42289e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f0a3ced6-c39e-47e6-bd95-6a71cc6df60a" xlink:to="loc_us-gaap_CreditFacilityAxis_11b925a8-82d7-48aa-aeb2-9886c42289e1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_11b925a8-82d7-48aa-aeb2-9886c42289e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_11b925a8-82d7-48aa-aeb2-9886c42289e1" xlink:to="loc_us-gaap_CreditFacilityDomain_11b925a8-82d7-48aa-aeb2-9886c42289e1_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ba9c910c-5d54-45fc-ada5-dda2198b0a97" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_11b925a8-82d7-48aa-aeb2-9886c42289e1" xlink:to="loc_us-gaap_CreditFacilityDomain_ba9c910c-5d54-45fc-ada5-dda2198b0a97" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_75293cd3-57b5-4b57-9da0-46fd5e22448c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ba9c910c-5d54-45fc-ada5-dda2198b0a97" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_75293cd3-57b5-4b57-9da0-46fd5e22448c" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_A2018RevolvingCreditFacilityMember_ec2737a6-43f6-4acd-940f-c9a3e7ebe5cf" xlink:href="gti-20221231.xsd#gti_A2018RevolvingCreditFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ba9c910c-5d54-45fc-ada5-dda2198b0a97" xlink:to="loc_gti_A2018RevolvingCreditFacilityMember_ec2737a6-43f6-4acd-940f-c9a3e7ebe5cf" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_05bff5b9-c32c-42bd-b5a5-02f58f0e4dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f0a3ced6-c39e-47e6-bd95-6a71cc6df60a" xlink:to="loc_us-gaap_DebtInstrumentAxis_05bff5b9-c32c-42bd-b5a5-02f58f0e4dd5" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_05bff5b9-c32c-42bd-b5a5-02f58f0e4dd5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_05bff5b9-c32c-42bd-b5a5-02f58f0e4dd5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_05bff5b9-c32c-42bd-b5a5-02f58f0e4dd5_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2e615531-401b-4e58-8f90-76975d32ad6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_05bff5b9-c32c-42bd-b5a5-02f58f0e4dd5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2e615531-401b-4e58-8f90-76975d32ad6c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_A2018CreditAgreementMember_5500195c-bdd3-421f-972b-6f834d04a6f9" xlink:href="gti-20221231.xsd#gti_A2018CreditAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2e615531-401b-4e58-8f90-76975d32ad6c" xlink:to="loc_gti_A2018CreditAgreementMember_5500195c-bdd3-421f-972b-6f834d04a6f9" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_2d1315a4-5e84-4a1c-b78e-6fc1725f87f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f0a3ced6-c39e-47e6-bd95-6a71cc6df60a" xlink:to="loc_us-gaap_VariableRateAxis_2d1315a4-5e84-4a1c-b78e-6fc1725f87f3" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_2d1315a4-5e84-4a1c-b78e-6fc1725f87f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2d1315a4-5e84-4a1c-b78e-6fc1725f87f3" xlink:to="loc_us-gaap_VariableRateDomain_2d1315a4-5e84-4a1c-b78e-6fc1725f87f3_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_a0b19447-ed3b-4b93-af23-a6a873d978d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2d1315a4-5e84-4a1c-b78e-6fc1725f87f3" xlink:to="loc_us-gaap_VariableRateDomain_a0b19447-ed3b-4b93-af23-a6a873d978d2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_AdjustedLIBORateMember_4fb2ce82-23fc-42ad-9dbb-57a8343cea5e" xlink:href="gti-20221231.xsd#gti_AdjustedLIBORateMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_a0b19447-ed3b-4b93-af23-a6a873d978d2" xlink:to="loc_gti_AdjustedLIBORateMember_4fb2ce82-23fc-42ad-9dbb-57a8343cea5e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ABRMember_56299cbe-7eb2-43a3-8dd1-e46d5417550f" xlink:href="gti-20221231.xsd#gti_ABRMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_a0b19447-ed3b-4b93-af23-a6a873d978d2" xlink:to="loc_gti_ABRMember_56299cbe-7eb2-43a3-8dd1-e46d5417550f" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/DebtAndLiquidity2020SeniorNotesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#DebtAndLiquidity2020SeniorNotesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/DebtAndLiquidity2020SeniorNotesDetails" xlink:type="extended" id="i82801d0895de4a1da65805aa4229bb26_DebtAndLiquidity2020SeniorNotesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_0df08b43-0c84-425a-86e7-917df159f8d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_0df08b43-0c84-425a-86e7-917df159f8d3" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_20696726-06c5-4fae-bd84-ba36599f1c69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_20696726-06c5-4fae-bd84-ba36599f1c69" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_7f6938e0-f15d-4899-912f-76d0d689917d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_7f6938e0-f15d-4899-912f-76d0d689917d" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentRedemptionPricePremiumApplicablePercentage_4df82e73-da8b-499a-bfdb-3c408c06ff7c" xlink:href="gti-20221231.xsd#gti_DebtInstrumentRedemptionPricePremiumApplicablePercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_gti_DebtInstrumentRedemptionPricePremiumApplicablePercentage_4df82e73-da8b-499a-bfdb-3c408c06ff7c" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentCovenantRestrictedPaymentsAllowableWithNoDefaultOrEventOfDefaultProFormaConsolidatedFirstLienNetLeverageRatioMaximum_992ac25a-127c-45d8-8296-dea6779d37f8" xlink:href="gti-20221231.xsd#gti_DebtInstrumentCovenantRestrictedPaymentsAllowableWithNoDefaultOrEventOfDefaultProFormaConsolidatedFirstLienNetLeverageRatioMaximum"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_gti_DebtInstrumentCovenantRestrictedPaymentsAllowableWithNoDefaultOrEventOfDefaultProFormaConsolidatedFirstLienNetLeverageRatioMaximum_992ac25a-127c-45d8-8296-dea6779d37f8" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentCovenantRestrictedPaymentsAllowablePursuantToCertainBasketsProFormaConsolidatedFirstLienNetLeverageRatioMaximum_5c72b053-0784-4a61-960c-10105be39c26" xlink:href="gti-20221231.xsd#gti_DebtInstrumentCovenantRestrictedPaymentsAllowablePursuantToCertainBasketsProFormaConsolidatedFirstLienNetLeverageRatioMaximum"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_gti_DebtInstrumentCovenantRestrictedPaymentsAllowablePursuantToCertainBasketsProFormaConsolidatedFirstLienNetLeverageRatioMaximum_5c72b053-0784-4a61-960c-10105be39c26" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_74e3feea-5218-4d9b-af23-79e68783fa62" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_74e3feea-5218-4d9b-af23-79e68783fa62" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DebtInstrumentEventOfDefaultPercentageOfDebtHeld_b98b5406-7eff-422e-ab76-95298c6afa0b" xlink:href="gti-20221231.xsd#gti_DebtInstrumentEventOfDefaultPercentageOfDebtHeld"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_gti_DebtInstrumentEventOfDefaultPercentageOfDebtHeld_b98b5406-7eff-422e-ab76-95298c6afa0b" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_1a4f43cb-ad86-4d17-a96b-14011a8e02db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_806bcc4e-d989-4401-8152-2429f9db90ab" xlink:to="loc_us-gaap_DebtInstrumentTable_1a4f43cb-ad86-4d17-a96b-14011a8e02db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_87745c6a-3439-47eb-bbbd-835e8b854437" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1a4f43cb-ad86-4d17-a96b-14011a8e02db" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_87745c6a-3439-47eb-bbbd-835e8b854437" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_87745c6a-3439-47eb-bbbd-835e8b854437_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_87745c6a-3439-47eb-bbbd-835e8b854437" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_87745c6a-3439-47eb-bbbd-835e8b854437_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3e582e1d-0cf9-4bab-b223-ce5019b0d8d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_87745c6a-3439-47eb-bbbd-835e8b854437" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3e582e1d-0cf9-4bab-b223-ce5019b0d8d1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_92629ddf-7cdc-4d23-be35-f57002d8fe48" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3e582e1d-0cf9-4bab-b223-ce5019b0d8d1" xlink:to="loc_us-gaap_SecuredDebtMember_92629ddf-7cdc-4d23-be35-f57002d8fe48" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5fca275a-dde6-47b7-9521-b1a8bf13d5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1a4f43cb-ad86-4d17-a96b-14011a8e02db" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5fca275a-dde6-47b7-9521-b1a8bf13d5a6" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_5fca275a-dde6-47b7-9521-b1a8bf13d5a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5fca275a-dde6-47b7-9521-b1a8bf13d5a6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_5fca275a-dde6-47b7-9521-b1a8bf13d5a6_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8bffdf46-c531-4f54-a313-c04a6a05c96b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5fca275a-dde6-47b7-9521-b1a8bf13d5a6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8bffdf46-c531-4f54-a313-c04a6a05c96b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_a0c30b9a-d33f-44ad-ae87-aba4dfc74a7e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8bffdf46-c531-4f54-a313-c04a6a05c96b" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_a0c30b9a-d33f-44ad-ae87-aba4dfc74a7e" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfIntangibleAssetsWithDeterminableUsefulLivesByMajorCategoryDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#GoodwillAndOtherIntangibleAssetsScheduleOfIntangibleAssetsWithDeterminableUsefulLivesByMajorCategoryDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfIntangibleAssetsWithDeterminableUsefulLivesByMajorCategoryDetails" xlink:type="extended" id="i4fdd4ad625df4ab9a7ff5830f57e07c9_GoodwillAndOtherIntangibleAssetsScheduleOfIntangibleAssetsWithDeterminableUsefulLivesByMajorCategoryDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_61f8ad7f-1564-47b2-ba9a-e72c93cc39a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d9deb627-cfb2-485c-b043-87ff4db8a6ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_61f8ad7f-1564-47b2-ba9a-e72c93cc39a8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d9deb627-cfb2-485c-b043-87ff4db8a6ce" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b71e1560-6471-4c9c-afce-cd9f6333881d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_61f8ad7f-1564-47b2-ba9a-e72c93cc39a8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b71e1560-6471-4c9c-afce-cd9f6333881d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_68e2979e-67b0-49f5-8f13-31761facab92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_61f8ad7f-1564-47b2-ba9a-e72c93cc39a8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_68e2979e-67b0-49f5-8f13-31761facab92" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5dc31a81-a456-4436-bcde-dbaf4a934443" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_61f8ad7f-1564-47b2-ba9a-e72c93cc39a8" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5dc31a81-a456-4436-bcde-dbaf4a934443" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_cd8e9ff5-a4df-4dae-8afd-6c2210ca4ded" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5dc31a81-a456-4436-bcde-dbaf4a934443" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_cd8e9ff5-a4df-4dae-8afd-6c2210ca4ded" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cd8e9ff5-a4df-4dae-8afd-6c2210ca4ded_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_cd8e9ff5-a4df-4dae-8afd-6c2210ca4ded" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cd8e9ff5-a4df-4dae-8afd-6c2210ca4ded_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dcc5d1a9-1f2d-4fdc-980e-9030d27dc0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_cd8e9ff5-a4df-4dae-8afd-6c2210ca4ded" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dcc5d1a9-1f2d-4fdc-980e-9030d27dc0b1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_2a631bf2-cedd-405a-b70a-8d893c9fc597" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dcc5d1a9-1f2d-4fdc-980e-9030d27dc0b1" xlink:to="loc_us-gaap_TradeNamesMember_2a631bf2-cedd-405a-b70a-8d893c9fc597" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyEquipmentMember_7697d434-b64f-4869-9840-3901e9e3df3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dcc5d1a9-1f2d-4fdc-980e-9030d27dc0b1" xlink:to="loc_us-gaap_TechnologyEquipmentMember_7697d434-b64f-4869-9840-3901e9e3df3a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_de309038-1ffe-420d-ab4b-3dbd5a53758f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dcc5d1a9-1f2d-4fdc-980e-9030d27dc0b1" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_de309038-1ffe-420d-ab4b-3dbd5a53758f" xlink:type="arc" order="2"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/InterestExpenseNarrativeDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#InterestExpenseNarrativeDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/InterestExpenseNarrativeDetails" xlink:type="extended" id="ib122a38c390a46eca2d2c9e8e6851c7e_InterestExpenseNarrativeDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5c7e395b-17ff-425c-9c66-1f2357b4a0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5c7e395b-17ff-425c-9c66-1f2357b4a0a1" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_eeb6ed35-b593-4dd6-b3f8-3c04761ffffe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_eeb6ed35-b593-4dd6-b3f8-3c04761ffffe" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_3023dc50-292e-496e-a668-bf48df346125" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfLongTermDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_3023dc50-292e-496e-a668-bf48df346125" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionExpense_2e17901d-663c-4bf5-987a-8ed595976a13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccretionExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_AccretionExpense_2e17901d-663c-4bf5-987a-8ed595976a13" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_c3f3d307-b00d-4e71-b67c-e61f9caa26d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfFinancingCosts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_c3f3d307-b00d-4e71-b67c-e61f9caa26d1" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtRestructuringCosts_58c3526c-e5ec-4800-9ae5-fec9a851a7cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfDebtRestructuringCosts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_PaymentsOfDebtRestructuringCosts_58c3526c-e5ec-4800-9ae5-fec9a851a7cb" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_5019f546-77f3-4f25-ad50-bd73421c8678" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_5019f546-77f3-4f25-ad50-bd73421c8678" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c2edd767-b8bf-4d36-a1e3-2cbfc1f036bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2074e135-deb2-442b-b86e-be06da49b56b" xlink:to="loc_us-gaap_DebtInstrumentTable_c2edd767-b8bf-4d36-a1e3-2cbfc1f036bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_edcc4b36-8818-49e7-857b-8c38061a494a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2edd767-b8bf-4d36-a1e3-2cbfc1f036bc" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_edcc4b36-8818-49e7-857b-8c38061a494a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_edcc4b36-8818-49e7-857b-8c38061a494a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_edcc4b36-8818-49e7-857b-8c38061a494a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_edcc4b36-8818-49e7-857b-8c38061a494a_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f901a19a-469b-4056-b23f-60ad34e689d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_edcc4b36-8818-49e7-857b-8c38061a494a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f901a19a-469b-4056-b23f-60ad34e689d8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_ff9b48b9-0c35-43df-9529-0b37436f32f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_f901a19a-469b-4056-b23f-60ad34e689d8" xlink:to="loc_us-gaap_SecuredDebtMember_ff9b48b9-0c35-43df-9529-0b37436f32f1" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_dad24967-5e78-4b84-b431-955e5479b5e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2edd767-b8bf-4d36-a1e3-2cbfc1f036bc" xlink:to="loc_us-gaap_DebtInstrumentAxis_dad24967-5e78-4b84-b431-955e5479b5e9" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_dad24967-5e78-4b84-b431-955e5479b5e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_dad24967-5e78-4b84-b431-955e5479b5e9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_dad24967-5e78-4b84-b431-955e5479b5e9_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_99639f6d-2696-48ab-a10b-5aac4171fca5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_dad24967-5e78-4b84-b431-955e5479b5e9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_99639f6d-2696-48ab-a10b-5aac4171fca5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_A2018TermLoanFacilityMember_5956888f-d0f3-417f-aac4-c6b9c44a3083" xlink:href="gti-20221231.xsd#gti_A2018TermLoanFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_99639f6d-2696-48ab-a10b-5aac4171fca5" xlink:to="loc_gti_A2018TermLoanFacilityMember_5956888f-d0f3-417f-aac4-c6b9c44a3083" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsNarrativeDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsNarrativeDetails" xlink:type="extended" id="id4969e4469be4884b54e652ffe64577c_FairValueMeasurementsAndDerivativeInstrumentsNarrativeDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_f66f4c01-31e5-45a6-95c3-aee717be776f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativesFairValueLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_6931a215-2c75-4579-934e-499b9659ba69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_f66f4c01-31e5-45a6-95c3-aee717be776f" xlink:to="loc_us-gaap_LongTermDebtFairValue_6931a215-2c75-4579-934e-499b9659ba69" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_1179af7f-93cb-4ebe-b2c9-23e7f46d383d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosure"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_f66f4c01-31e5-45a6-95c3-aee717be776f" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_1179af7f-93cb-4ebe-b2c9-23e7f46d383d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_77321535-ee41-4f05-99c3-9225300e5dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_f66f4c01-31e5-45a6-95c3-aee717be776f" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_77321535-ee41-4f05-99c3-9225300e5dfb" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainOnDerivative_230d0f89-0ef4-4692-b313-dd0a6464c059" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeGainOnDerivative"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_f66f4c01-31e5-45a6-95c3-aee717be776f" xlink:to="loc_us-gaap_DerivativeGainOnDerivative_230d0f89-0ef4-4692-b313-dd0a6464c059" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_56f2e9f2-bcd5-4ead-a58a-0974799a688b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_f66f4c01-31e5-45a6-95c3-aee717be776f" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_56f2e9f2-bcd5-4ead-a58a-0974799a688b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_4552de3b-e951-4f64-8f42-c690406a2ff5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_56f2e9f2-bcd5-4ead-a58a-0974799a688b" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_4552de3b-e951-4f64-8f42-c690406a2ff5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_4552de3b-e951-4f64-8f42-c690406a2ff5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4552de3b-e951-4f64-8f42-c690406a2ff5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_4552de3b-e951-4f64-8f42-c690406a2ff5_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b8661552-3dc0-49e7-b0d7-c3ad0ede98fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4552de3b-e951-4f64-8f42-c690406a2ff5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b8661552-3dc0-49e7-b0d7-c3ad0ede98fd" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_7a94515a-fbbb-4802-a015-acb297dba0c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b8661552-3dc0-49e7-b0d7-c3ad0ede98fd" xlink:to="loc_us-gaap_InterestRateSwapMember_7a94515a-fbbb-4802-a015-acb297dba0c1" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_InterestRateSwapTwoMember_f891de6a-a993-4b3d-82c5-cb9f7d9d8869" xlink:href="gti-20221231.xsd#gti_InterestRateSwapTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b8661552-3dc0-49e7-b0d7-c3ad0ede98fd" xlink:to="loc_gti_InterestRateSwapTwoMember_f891de6a-a993-4b3d-82c5-cb9f7d9d8869" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityMember_baa03194-6a87-4259-b063-d8271b327013" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b8661552-3dc0-49e7-b0d7-c3ad0ede98fd" xlink:to="loc_us-gaap_CommodityMember_baa03194-6a87-4259-b063-d8271b327013" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_dd4c05bb-8584-4337-8f46-4729d10c97cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_56f2e9f2-bcd5-4ead-a58a-0974799a688b" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_dd4c05bb-8584-4337-8f46-4729d10c97cb" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dd4c05bb-8584-4337-8f46-4729d10c97cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_dd4c05bb-8584-4337-8f46-4729d10c97cb" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dd4c05bb-8584-4337-8f46-4729d10c97cb_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8dedad37-a8a1-43a7-952f-b2c15f40fb67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_dd4c05bb-8584-4337-8f46-4729d10c97cb" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8dedad37-a8a1-43a7-952f-b2c15f40fb67" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_6ea310d4-2ba9-4eac-bb82-32b8bbb8879c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8dedad37-a8a1-43a7-952f-b2c15f40fb67" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_6ea310d4-2ba9-4eac-bb82-32b8bbb8879c" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_84d17d5e-60eb-4cd9-ba70-8fef354d706d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8dedad37-a8a1-43a7-952f-b2c15f40fb67" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_84d17d5e-60eb-4cd9-ba70-8fef354d706d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_300e6e13-d565-45c5-86a2-2d209355ad08" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_56f2e9f2-bcd5-4ead-a58a-0974799a688b" xlink:to="loc_srt_StatementScenarioAxis_300e6e13-d565-45c5-86a2-2d209355ad08" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_300e6e13-d565-45c5-86a2-2d209355ad08_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_300e6e13-d565-45c5-86a2-2d209355ad08" xlink:to="loc_srt_ScenarioUnspecifiedDomain_300e6e13-d565-45c5-86a2-2d209355ad08_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_8785e11b-baa1-489a-89f1-021edbf0a6e8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_300e6e13-d565-45c5-86a2-2d209355ad08" xlink:to="loc_srt_ScenarioUnspecifiedDomain_8785e11b-baa1-489a-89f1-021edbf0a6e8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioPlanMember_e4f90614-85bb-4c10-90e8-1c6d3e988a45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_8785e11b-baa1-489a-89f1-021edbf0a6e8" xlink:to="loc_us-gaap_ScenarioPlanMember_e4f90614-85bb-4c10-90e8-1c6d3e988a45" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_f250c0af-c889-4f49-9f2e-0636eab60499" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_56f2e9f2-bcd5-4ead-a58a-0974799a688b" xlink:to="loc_us-gaap_HedgingDesignationAxis_f250c0af-c889-4f49-9f2e-0636eab60499" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_f250c0af-c889-4f49-9f2e-0636eab60499_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_f250c0af-c889-4f49-9f2e-0636eab60499" xlink:to="loc_us-gaap_HedgingDesignationDomain_f250c0af-c889-4f49-9f2e-0636eab60499_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_cdfb3c3a-7934-4842-b49c-a4a00ec56fac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_f250c0af-c889-4f49-9f2e-0636eab60499" xlink:to="loc_us-gaap_HedgingDesignationDomain_cdfb3c3a-7934-4842-b49c-a4a00ec56fac" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_3f088818-63be-41c1-8416-454e0b8a642f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_cdfb3c3a-7934-4842-b49c-a4a00ec56fac" xlink:to="loc_us-gaap_NondesignatedMember_3f088818-63be-41c1-8416-454e0b8a642f" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsScheduleOfRealizedGainsLossesOnDerivativesRecognizedInStatementOfOperationsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsScheduleOfRealizedGainsLossesOnDerivativesRecognizedInStatementOfOperationsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsScheduleOfRealizedGainsLossesOnDerivativesRecognizedInStatementOfOperationsDetails" xlink:type="extended" id="if6f5d876adbb4ee5b878254db11db14b_FairValueMeasurementsAndDerivativeInstrumentsScheduleOfRealizedGainsLossesOnDerivativesRecognizedInStatementOfOperationsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_bcb9c5b4-d935-4e14-90dd-469a1e37804a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativesFairValueLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_feea2b59-c276-409a-b562-2506cd5197a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_bcb9c5b4-d935-4e14-90dd-469a1e37804a" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_feea2b59-c276-409a-b562-2506cd5197a4" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1136b76a-d6aa-4f78-ae42-381cc6764e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_bcb9c5b4-d935-4e14-90dd-469a1e37804a" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1136b76a-d6aa-4f78-ae42-381cc6764e5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_f99ffdfa-8fd2-47b2-a306-228fdded1d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1136b76a-d6aa-4f78-ae42-381cc6764e5a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_f99ffdfa-8fd2-47b2-a306-228fdded1d7a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f99ffdfa-8fd2-47b2-a306-228fdded1d7a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f99ffdfa-8fd2-47b2-a306-228fdded1d7a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f99ffdfa-8fd2-47b2-a306-228fdded1d7a_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_39af2ef3-31f6-427f-8f19-79c674c0eac4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f99ffdfa-8fd2-47b2-a306-228fdded1d7a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_39af2ef3-31f6-427f-8f19-79c674c0eac4" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_a2e28475-3637-4dea-b08d-3ddf2c8a8152" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_39af2ef3-31f6-427f-8f19-79c674c0eac4" xlink:to="loc_us-gaap_InterestRateSwapMember_a2e28475-3637-4dea-b08d-3ddf2c8a8152" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_1a6ed535-230c-4ea9-9144-c30aa66efe97" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_39af2ef3-31f6-427f-8f19-79c674c0eac4" xlink:to="loc_us-gaap_CommodityContractMember_1a6ed535-230c-4ea9-9144-c30aa66efe97" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ForeignCurrencyDerivativesMember_d544986a-1d94-43e7-a4e7-4666e7c86055" xlink:href="gti-20221231.xsd#gti_ForeignCurrencyDerivativesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_39af2ef3-31f6-427f-8f19-79c674c0eac4" xlink:to="loc_gti_ForeignCurrencyDerivativesMember_d544986a-1d94-43e7-a4e7-4666e7c86055" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_e3ce4c6c-8656-461b-b438-fb18ec890e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1136b76a-d6aa-4f78-ae42-381cc6764e5a" xlink:to="loc_us-gaap_FinancialInstrumentAxis_e3ce4c6c-8656-461b-b438-fb18ec890e1b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e3ce4c6c-8656-461b-b438-fb18ec890e1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_e3ce4c6c-8656-461b-b438-fb18ec890e1b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e3ce4c6c-8656-461b-b438-fb18ec890e1b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe4609e3-2b64-488e-aafd-a65d91870f05" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_e3ce4c6c-8656-461b-b438-fb18ec890e1b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe4609e3-2b64-488e-aafd-a65d91870f05" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_ade8f810-afae-4cb1-89c7-4adc6d9c7a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1136b76a-d6aa-4f78-ae42-381cc6764e5a" xlink:to="loc_us-gaap_HedgingDesignationAxis_ade8f810-afae-4cb1-89c7-4adc6d9c7a4a" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_ade8f810-afae-4cb1-89c7-4adc6d9c7a4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_ade8f810-afae-4cb1-89c7-4adc6d9c7a4a" xlink:to="loc_us-gaap_HedgingDesignationDomain_ade8f810-afae-4cb1-89c7-4adc6d9c7a4a_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_8260adfb-26ed-4044-8010-947031e01019" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_ade8f810-afae-4cb1-89c7-4adc6d9c7a4a" xlink:to="loc_us-gaap_HedgingDesignationDomain_8260adfb-26ed-4044-8010-947031e01019" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_89eb38fd-e75b-4d49-8941-c984268ad05b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8260adfb-26ed-4044-8010-947031e01019" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_89eb38fd-e75b-4d49-8941-c984268ad05b" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsLevelTableDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsLevelTableDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsLevelTableDetails" xlink:type="extended" id="iba747fbcd70d4187932e9d6835c7a375_FairValueMeasurementsLevelTableDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_f5abaa00-e620-4869-b2ca-19eb1b39ec34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_182f0aad-0cc1-494b-85cb-4ba27bf71417" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosure"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_f5abaa00-e620-4869-b2ca-19eb1b39ec34" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_182f0aad-0cc1-494b-85cb-4ba27bf71417" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_c7ad525d-5e13-498d-81d1-05fc34c321ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_f5abaa00-e620-4869-b2ca-19eb1b39ec34" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_c7ad525d-5e13-498d-81d1-05fc34c321ae" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_f4fb7f1e-4174-49d8-949b-7350d1bc650e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_f5abaa00-e620-4869-b2ca-19eb1b39ec34" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_f4fb7f1e-4174-49d8-949b-7350d1bc650e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_ada1027a-48b1-4e4c-ae25-d0142d6488cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_f4fb7f1e-4174-49d8-949b-7350d1bc650e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_ada1027a-48b1-4e4c-ae25-d0142d6488cb" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ada1027a-48b1-4e4c-ae25-d0142d6488cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_ada1027a-48b1-4e4c-ae25-d0142d6488cb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ada1027a-48b1-4e4c-ae25-d0142d6488cb_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c67478b9-ef65-42d9-a743-4aae2d97d485" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_ada1027a-48b1-4e4c-ae25-d0142d6488cb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c67478b9-ef65-42d9-a743-4aae2d97d485" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ForeignCurrencyDerivativesMember_abe48fff-32fd-4f3a-aab7-af5c8ae889f6" xlink:href="gti-20221231.xsd#gti_ForeignCurrencyDerivativesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c67478b9-ef65-42d9-a743-4aae2d97d485" xlink:to="loc_gti_ForeignCurrencyDerivativesMember_abe48fff-32fd-4f3a-aab7-af5c8ae889f6" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_c3496b76-4d38-40cc-9809-057a06237472" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c67478b9-ef65-42d9-a743-4aae2d97d485" xlink:to="loc_us-gaap_InterestRateSwapMember_c3496b76-4d38-40cc-9809-057a06237472" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityMember_1e8e90e9-88c0-47ed-a2b9-40c90afc8009" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c67478b9-ef65-42d9-a743-4aae2d97d485" xlink:to="loc_us-gaap_CommodityMember_1e8e90e9-88c0-47ed-a2b9-40c90afc8009" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0c5097e3-1d5b-403d-b04a-e13088fa85ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_f4fb7f1e-4174-49d8-949b-7350d1bc650e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0c5097e3-1d5b-403d-b04a-e13088fa85ee" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0c5097e3-1d5b-403d-b04a-e13088fa85ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0c5097e3-1d5b-403d-b04a-e13088fa85ee" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0c5097e3-1d5b-403d-b04a-e13088fa85ee_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f33fb7a6-0951-4d89-8424-9ccae0c49fd5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0c5097e3-1d5b-403d-b04a-e13088fa85ee" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f33fb7a6-0951-4d89-8424-9ccae0c49fd5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_63ff001d-4595-47f9-b0e6-48ab5a77d44d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f33fb7a6-0951-4d89-8424-9ccae0c49fd5" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_63ff001d-4595-47f9-b0e6-48ab5a77d44d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_0d4d9a9a-ea22-4ba4-9b3f-eed345f75c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f33fb7a6-0951-4d89-8424-9ccae0c49fd5" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_0d4d9a9a-ea22-4ba4-9b3f-eed345f75c7d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_fe56a617-435c-4465-ace3-5fcfdc9af5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f33fb7a6-0951-4d89-8424-9ccae0c49fd5" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_fe56a617-435c-4465-ace3-5fcfdc9af5a6" xlink:type="arc" order="2"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails" xlink:type="extended" id="i4d66cb633f284841835f55906fdb8088_FairValueMeasurementsAndDerivativeInstrumentsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_NumberOfDerivativeContractsEntered_41f6c1e0-615e-44d4-b941-cda4d4f6f0a6" xlink:href="gti-20221231.xsd#gti_NumberOfDerivativeContractsEntered"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_gti_NumberOfDerivativeContractsEntered_41f6c1e0-615e-44d4-b941-cda4d4f6f0a6" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_c5326606-2da5-46f9-92c0-dc39b9abb6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_c5326606-2da5-46f9-92c0-dc39b9abb6b9" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_96de8852-4e61-49ef-b962-329ade13f4c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_96de8852-4e61-49ef-b962-329ade13f4c2" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_186c3080-f264-4b9d-bfd4-1bbdab16597f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DerivativeNotionalAmount_186c3080-f264-4b9d-bfd4-1bbdab16597f" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_e51ae858-bf11-430b-b92d-b57c76d86df1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_e51ae858-bf11-430b-b92d-b57c76d86df1" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GainUponPartialTerminationOfInterestRateSwap_90ce3900-d2f1-4a8c-951e-1c54774c0957" xlink:href="gti-20221231.xsd#gti_GainUponPartialTerminationOfInterestRateSwap"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_gti_GainUponPartialTerminationOfInterestRateSwap_90ce3900-d2f1-4a8c-951e-1c54774c0957" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCashReceivedOnHedge_7d4b7db4-c7be-4c50-a481-bdf73ce85258" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeCashReceivedOnHedge"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DerivativeCashReceivedOnHedge_7d4b7db4-c7be-4c50-a481-bdf73ce85258" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainOnDerivative_20bb5c58-322f-4623-b648-b1b9d79f3731" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeGainOnDerivative"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DerivativeGainOnDerivative_20bb5c58-322f-4623-b648-b1b9d79f3731" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_0743b778-f5ae-4770-836c-c7e2c02bfdec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_0743b778-f5ae-4770-836c-c7e2c02bfdec" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgeIneffectivenessNet_0e992844-a29d-4eb9-9347-52ca09bb7cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnFairValueHedgeIneffectivenessNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_GainLossOnFairValueHedgeIneffectivenessNet_0e992844-a29d-4eb9-9347-52ca09bb7cbf" xlink:type="arc" order="9"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b34f1224-ed62-41ac-9d0f-ff7fae6adf5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_bef0d018-16a3-4e88-b9b6-cf9decc5fbd6" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b34f1224-ed62-41ac-9d0f-ff7fae6adf5d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_14aadf77-6a44-4209-92b1-4218b6363985" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b34f1224-ed62-41ac-9d0f-ff7fae6adf5d" xlink:to="loc_srt_StatementScenarioAxis_14aadf77-6a44-4209-92b1-4218b6363985" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_14aadf77-6a44-4209-92b1-4218b6363985_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_14aadf77-6a44-4209-92b1-4218b6363985" xlink:to="loc_srt_ScenarioUnspecifiedDomain_14aadf77-6a44-4209-92b1-4218b6363985_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_f2cd4400-b9fe-4b24-b6e5-a43e19ec778b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_14aadf77-6a44-4209-92b1-4218b6363985" xlink:to="loc_srt_ScenarioUnspecifiedDomain_f2cd4400-b9fe-4b24-b6e5-a43e19ec778b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioPlanMember_c7fcbdd9-f774-487d-83ea-d146cb51c245" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_f2cd4400-b9fe-4b24-b6e5-a43e19ec778b" xlink:to="loc_us-gaap_ScenarioPlanMember_c7fcbdd9-f774-487d-83ea-d146cb51c245" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_14201aae-1c1f-461e-9934-b2cd4f207578" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b34f1224-ed62-41ac-9d0f-ff7fae6adf5d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_14201aae-1c1f-461e-9934-b2cd4f207578" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_14201aae-1c1f-461e-9934-b2cd4f207578_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_14201aae-1c1f-461e-9934-b2cd4f207578" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_14201aae-1c1f-461e-9934-b2cd4f207578_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_14201aae-1c1f-461e-9934-b2cd4f207578" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeparatedHostFinancialInstrumentFairValueOptionMember_64ea42b4-f1c1-412a-aee1-83bd9a7e6921" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeparatedHostFinancialInstrumentFairValueOptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:to="loc_us-gaap_SeparatedHostFinancialInstrumentFairValueOptionMember_64ea42b4-f1c1-412a-aee1-83bd9a7e6921" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_e86e49cc-1276-43c5-89e8-dbf14d1f261c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:to="loc_us-gaap_InterestRateSwapMember_e86e49cc-1276-43c5-89e8-dbf14d1f261c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_884519fa-becf-4564-9b73-dab28f953ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_884519fa-becf-4564-9b73-dab28f953ca0" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityMember_e1259dfb-1ab2-4638-a91d-33a63624ae10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:to="loc_us-gaap_CommodityMember_e1259dfb-1ab2-4638-a91d-33a63624ae10" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_0057b771-29a3-4b12-bcf2-cdd60f2d2c37" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:to="loc_us-gaap_CommodityContractMember_0057b771-29a3-4b12-bcf2-cdd60f2d2c37" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ForeignCurrencyDerivativesMember_d529dbb1-a10a-46b8-9362-68a114fec886" xlink:href="gti-20221231.xsd#gti_ForeignCurrencyDerivativesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1048ed2d-5786-48d7-86a5-63b1d9d527e5" xlink:to="loc_gti_ForeignCurrencyDerivativesMember_d529dbb1-a10a-46b8-9362-68a114fec886" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_0ca84934-cc43-45df-9b2c-1d542bddf00b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b34f1224-ed62-41ac-9d0f-ff7fae6adf5d" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_0ca84934-cc43-45df-9b2c-1d542bddf00b" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0ca84934-cc43-45df-9b2c-1d542bddf00b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_0ca84934-cc43-45df-9b2c-1d542bddf00b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0ca84934-cc43-45df-9b2c-1d542bddf00b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_e6ea1486-77b6-4257-8873-1b5907c08556" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_0ca84934-cc43-45df-9b2c-1d542bddf00b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_e6ea1486-77b6-4257-8873-1b5907c08556" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_214793a5-c419-4fe1-92f8-af768197e816" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_e6ea1486-77b6-4257-8873-1b5907c08556" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_214793a5-c419-4fe1-92f8-af768197e816" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_b62e0416-8b04-4f8d-a378-f14c16d13fbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_e6ea1486-77b6-4257-8873-1b5907c08556" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_b62e0416-8b04-4f8d-a378-f14c16d13fbe" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_70d74a5b-905f-482a-8246-6f86a9099e2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b34f1224-ed62-41ac-9d0f-ff7fae6adf5d" xlink:to="loc_us-gaap_HedgingDesignationAxis_70d74a5b-905f-482a-8246-6f86a9099e2e" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_70d74a5b-905f-482a-8246-6f86a9099e2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_70d74a5b-905f-482a-8246-6f86a9099e2e" xlink:to="loc_us-gaap_HedgingDesignationDomain_70d74a5b-905f-482a-8246-6f86a9099e2e_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_ea3011e1-3899-4866-8e70-c6e7b45098ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_70d74a5b-905f-482a-8246-6f86a9099e2e" xlink:to="loc_us-gaap_HedgingDesignationDomain_ea3011e1-3899-4866-8e70-c6e7b45098ee" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_600907da-1f21-4cd6-9eef-094186ca0903" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ea3011e1-3899-4866-8e70-c6e7b45098ee" xlink:to="loc_us-gaap_NondesignatedMember_600907da-1f21-4cd6-9eef-094186ca0903" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails1" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsDetails1"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails1" xlink:type="extended" id="idb3174164fe84815888c1f08aabc0c32_FairValueMeasurementsAndDerivativeInstrumentsDetails1">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_79b10391-4cc6-45ed-bf90-a2a7ceefff0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_a127dbff-7bda-4791-abd3-88067307393f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_79b10391-4cc6-45ed-bf90-a2a7ceefff0e" xlink:to="loc_us-gaap_DerivativeNotionalAmount_a127dbff-7bda-4791-abd3-88067307393f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_083c67d0-bac7-4210-b49c-e7056e62d47c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_79b10391-4cc6-45ed-bf90-a2a7ceefff0e" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_083c67d0-bac7-4210-b49c-e7056e62d47c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_10d1ee4b-a339-4256-8c56-e9ea5dc88525" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_083c67d0-bac7-4210-b49c-e7056e62d47c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_10d1ee4b-a339-4256-8c56-e9ea5dc88525" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_10d1ee4b-a339-4256-8c56-e9ea5dc88525_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_10d1ee4b-a339-4256-8c56-e9ea5dc88525" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_10d1ee4b-a339-4256-8c56-e9ea5dc88525_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8ce53ff9-986d-4152-bd83-dcbcefa6a390" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_10d1ee4b-a339-4256-8c56-e9ea5dc88525" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8ce53ff9-986d-4152-bd83-dcbcefa6a390" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_8a6338f6-8c56-442d-a5f9-22b93d3b4efb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8ce53ff9-986d-4152-bd83-dcbcefa6a390" xlink:to="loc_us-gaap_CommodityContractMember_8a6338f6-8c56-442d-a5f9-22b93d3b4efb" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_d2660f63-cdce-478f-9fb8-ed7cadf5cfaf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8ce53ff9-986d-4152-bd83-dcbcefa6a390" xlink:to="loc_us-gaap_InterestRateSwapMember_d2660f63-cdce-478f-9fb8-ed7cadf5cfaf" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ForeignCurrencyDerivativesMember_b37baca5-fd06-4d5d-989d-b0561ab0d87b" xlink:href="gti-20221231.xsd#gti_ForeignCurrencyDerivativesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8ce53ff9-986d-4152-bd83-dcbcefa6a390" xlink:to="loc_gti_ForeignCurrencyDerivativesMember_b37baca5-fd06-4d5d-989d-b0561ab0d87b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_89f29a60-1e55-4564-a07e-f6f6f77e19f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_083c67d0-bac7-4210-b49c-e7056e62d47c" xlink:to="loc_us-gaap_HedgingDesignationAxis_89f29a60-1e55-4564-a07e-f6f6f77e19f4" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_89f29a60-1e55-4564-a07e-f6f6f77e19f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_89f29a60-1e55-4564-a07e-f6f6f77e19f4" xlink:to="loc_us-gaap_HedgingDesignationDomain_89f29a60-1e55-4564-a07e-f6f6f77e19f4_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_848d501a-700c-401b-bdf2-866022b94ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_89f29a60-1e55-4564-a07e-f6f6f77e19f4" xlink:to="loc_us-gaap_HedgingDesignationDomain_848d501a-700c-401b-bdf2-866022b94ef6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_4f70f511-37fd-4855-a1b8-fa933bf21bcf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_848d501a-700c-401b-bdf2-866022b94ef6" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_4f70f511-37fd-4855-a1b8-fa933bf21bcf" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_b18110bd-e804-45c8-be73-34874e200512" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_848d501a-700c-401b-bdf2-866022b94ef6" xlink:to="loc_us-gaap_NondesignatedMember_b18110bd-e804-45c8-be73-34874e200512" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails2" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsDetails2"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails2" xlink:type="extended" id="ibc9c27ca350c43a6b6cc0d60f7854ad3_FairValueMeasurementsAndDerivativeInstrumentsDetails2">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_454b949e-41f2-4c7e-bd75-fd28b86ce497" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_6c131042-d500-43b4-8ada-b78ac69bd94e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_454b949e-41f2-4c7e-bd75-fd28b86ce497" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_6c131042-d500-43b4-8ada-b78ac69bd94e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_0860d5f3-5c3b-4068-a581-cb22b0d52bc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_454b949e-41f2-4c7e-bd75-fd28b86ce497" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_0860d5f3-5c3b-4068-a581-cb22b0d52bc1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_0d3599f3-5890-4dec-8d48-e2bf89a4be75" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_454b949e-41f2-4c7e-bd75-fd28b86ce497" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_0d3599f3-5890-4dec-8d48-e2bf89a4be75" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f1c988b8-27dd-4f29-9a84-4499bc1e49d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_454b949e-41f2-4c7e-bd75-fd28b86ce497" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f1c988b8-27dd-4f29-9a84-4499bc1e49d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_da7d8b51-ce99-46dc-81df-d1de9b70d8bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f1c988b8-27dd-4f29-9a84-4499bc1e49d2" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_da7d8b51-ce99-46dc-81df-d1de9b70d8bc" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_da7d8b51-ce99-46dc-81df-d1de9b70d8bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_da7d8b51-ce99-46dc-81df-d1de9b70d8bc" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_da7d8b51-ce99-46dc-81df-d1de9b70d8bc_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_9d4e89cb-386b-4f76-8c05-2d3d38badb60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_da7d8b51-ce99-46dc-81df-d1de9b70d8bc" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_9d4e89cb-386b-4f76-8c05-2d3d38badb60" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_0a312dfe-13d0-4324-9b70-4018d9194e8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d4e89cb-386b-4f76-8c05-2d3d38badb60" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_0a312dfe-13d0-4324-9b70-4018d9194e8e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_183be372-31fc-4a10-a2a1-41feb8b76d83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d4e89cb-386b-4f76-8c05-2d3d38badb60" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_183be372-31fc-4a10-a2a1-41feb8b76d83" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_8bb47926-e2dc-410b-bdf2-600a8263c004" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d4e89cb-386b-4f76-8c05-2d3d38badb60" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_8bb47926-e2dc-410b-bdf2-600a8263c004" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_85b5edce-59f5-4f9c-997f-025bf17233c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f1c988b8-27dd-4f29-9a84-4499bc1e49d2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_85b5edce-59f5-4f9c-997f-025bf17233c5" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_85b5edce-59f5-4f9c-997f-025bf17233c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_85b5edce-59f5-4f9c-997f-025bf17233c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_85b5edce-59f5-4f9c-997f-025bf17233c5_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_def0cec4-0775-4ee4-a758-0c1664cf3966" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_85b5edce-59f5-4f9c-997f-025bf17233c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_def0cec4-0775-4ee4-a758-0c1664cf3966" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_e951767a-d6ce-4627-97b2-3034592ccb20" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_def0cec4-0775-4ee4-a758-0c1664cf3966" xlink:to="loc_us-gaap_CommodityContractMember_e951767a-d6ce-4627-97b2-3034592ccb20" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_05e73933-e01c-43ce-b0eb-86686c597567" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_def0cec4-0775-4ee4-a758-0c1664cf3966" xlink:to="loc_us-gaap_InterestRateSwapMember_05e73933-e01c-43ce-b0eb-86686c597567" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_b2d5236f-5eb6-4376-ba5d-5f64d3df7abc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f1c988b8-27dd-4f29-9a84-4499bc1e49d2" xlink:to="loc_us-gaap_HedgingDesignationAxis_b2d5236f-5eb6-4376-ba5d-5f64d3df7abc" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_b2d5236f-5eb6-4376-ba5d-5f64d3df7abc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_b2d5236f-5eb6-4376-ba5d-5f64d3df7abc" xlink:to="loc_us-gaap_HedgingDesignationDomain_b2d5236f-5eb6-4376-ba5d-5f64d3df7abc_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_811d9427-ff15-42fb-ae1d-921d323b62d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_b2d5236f-5eb6-4376-ba5d-5f64d3df7abc" xlink:to="loc_us-gaap_HedgingDesignationDomain_811d9427-ff15-42fb-ae1d-921d323b62d5" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cb98624d-1f65-4fe5-a96b-2aad51c11d5b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_811d9427-ff15-42fb-ae1d-921d323b62d5" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cb98624d-1f65-4fe5-a96b-2aad51c11d5b" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails3" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsDetails3"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails3" xlink:type="extended" id="i666cf9e023dd49e58b91900ae9da1532_FairValueMeasurementsAndDerivativeInstrumentsDetails3">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_f7e4544d-cd0e-4c1f-9f9c-9be98b26c132" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_5adc1653-a5c4-4f77-a250-1c683d931e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_f7e4544d-cd0e-4c1f-9f9c-9be98b26c132" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_5adc1653-a5c4-4f77-a250-1c683d931e7a" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_df3427b9-6c6c-412d-8c66-f7061a382a53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_f7e4544d-cd0e-4c1f-9f9c-9be98b26c132" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_df3427b9-6c6c-412d-8c66-f7061a382a53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_9027663d-1d35-4fc4-bac4-406e3faa179b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_df3427b9-6c6c-412d-8c66-f7061a382a53" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_9027663d-1d35-4fc4-bac4-406e3faa179b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9027663d-1d35-4fc4-bac4-406e3faa179b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9027663d-1d35-4fc4-bac4-406e3faa179b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9027663d-1d35-4fc4-bac4-406e3faa179b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_689b19cc-51cc-4e26-9ce5-b758ddc14eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9027663d-1d35-4fc4-bac4-406e3faa179b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_689b19cc-51cc-4e26-9ce5-b758ddc14eb2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ForeignCurrencyDerivativesMember_144ef0c1-6813-4335-a752-8e40a2959b91" xlink:href="gti-20221231.xsd#gti_ForeignCurrencyDerivativesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_689b19cc-51cc-4e26-9ce5-b758ddc14eb2" xlink:to="loc_gti_ForeignCurrencyDerivativesMember_144ef0c1-6813-4335-a752-8e40a2959b91" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityMember_c4d64b91-f96f-4584-9ba1-5cd629e3dd29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_689b19cc-51cc-4e26-9ce5-b758ddc14eb2" xlink:to="loc_us-gaap_CommodityMember_c4d64b91-f96f-4584-9ba1-5cd629e3dd29" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_06fc300f-ffbb-4174-ad18-4caf5fc90959" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_689b19cc-51cc-4e26-9ce5-b758ddc14eb2" xlink:to="loc_us-gaap_InterestRateSwapMember_06fc300f-ffbb-4174-ad18-4caf5fc90959" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_158d68c4-d0da-4ac4-b8aa-3447c644e97f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_df3427b9-6c6c-412d-8c66-f7061a382a53" xlink:to="loc_us-gaap_HedgingDesignationAxis_158d68c4-d0da-4ac4-b8aa-3447c644e97f" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_158d68c4-d0da-4ac4-b8aa-3447c644e97f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_158d68c4-d0da-4ac4-b8aa-3447c644e97f" xlink:to="loc_us-gaap_HedgingDesignationDomain_158d68c4-d0da-4ac4-b8aa-3447c644e97f_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_8eab573c-f3be-4d7f-8bed-82bb88f189f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_158d68c4-d0da-4ac4-b8aa-3447c644e97f" xlink:to="loc_us-gaap_HedgingDesignationDomain_8eab573c-f3be-4d7f-8bed-82bb88f189f8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_8b99fba0-01bd-41a1-b6ec-e45dd315b7ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8eab573c-f3be-4d7f-8bed-82bb88f189f8" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_8b99fba0-01bd-41a1-b6ec-e45dd315b7ec" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_40a41038-c6f0-490b-9f09-bd65ac90ace3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8eab573c-f3be-4d7f-8bed-82bb88f189f8" xlink:to="loc_us-gaap_NondesignatedMember_40a41038-c6f0-490b-9f09-bd65ac90ace3" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails4" xlink:type="simple" xlink:href="gti-20221231.xsd#FairValueMeasurementsAndDerivativeInstrumentsDetails4"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/FairValueMeasurementsAndDerivativeInstrumentsDetails4" xlink:type="extended" id="i5410391482eb4fad8f710fe1434cdc71_FairValueMeasurementsAndDerivativeInstrumentsDetails4">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3d906f30-d10e-4d3b-8980-bfd50d6e75d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_cc6680e4-72a8-444e-aadc-9f6439fe842f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3d906f30-d10e-4d3b-8980-bfd50d6e75d6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_cc6680e4-72a8-444e-aadc-9f6439fe842f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_2b9b1c7f-71fa-4b38-a4f2-d93430029091" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3d906f30-d10e-4d3b-8980-bfd50d6e75d6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_2b9b1c7f-71fa-4b38-a4f2-d93430029091" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_b243014f-ef2b-4559-8be4-9808213d884b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3d906f30-d10e-4d3b-8980-bfd50d6e75d6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_b243014f-ef2b-4559-8be4-9808213d884b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3288f58e-d643-4e09-84e6-6684be0dfc32" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3d906f30-d10e-4d3b-8980-bfd50d6e75d6" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3288f58e-d643-4e09-84e6-6684be0dfc32" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_72764857-9050-4c10-8fc0-efc18f1464ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3288f58e-d643-4e09-84e6-6684be0dfc32" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_72764857-9050-4c10-8fc0-efc18f1464ea" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_72764857-9050-4c10-8fc0-efc18f1464ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_72764857-9050-4c10-8fc0-efc18f1464ea" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_72764857-9050-4c10-8fc0-efc18f1464ea_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_f53f7a6f-fa2d-422a-bb98-c807d47f0478" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_72764857-9050-4c10-8fc0-efc18f1464ea" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_f53f7a6f-fa2d-422a-bb98-c807d47f0478" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_d86b3397-9ace-452f-9268-84a790f43faf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f53f7a6f-fa2d-422a-bb98-c807d47f0478" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_d86b3397-9ace-452f-9268-84a790f43faf" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_172be513-9fbd-4de4-8e60-b024288f1ce1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f53f7a6f-fa2d-422a-bb98-c807d47f0478" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_172be513-9fbd-4de4-8e60-b024288f1ce1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_4781483c-f9e1-422a-bffe-f3b7d0871b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f53f7a6f-fa2d-422a-bb98-c807d47f0478" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_4781483c-f9e1-422a-bffe-f3b7d0871b1b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_bb8f6d05-3874-4f6b-837d-d0fb3a9bb244" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3288f58e-d643-4e09-84e6-6684be0dfc32" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_bb8f6d05-3874-4f6b-837d-d0fb3a9bb244" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_bb8f6d05-3874-4f6b-837d-d0fb3a9bb244_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_bb8f6d05-3874-4f6b-837d-d0fb3a9bb244" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_bb8f6d05-3874-4f6b-837d-d0fb3a9bb244_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_381a04cf-aa91-45dd-bec2-0ad46368b3c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_bb8f6d05-3874-4f6b-837d-d0fb3a9bb244" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_381a04cf-aa91-45dd-bec2-0ad46368b3c9" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_d2cf9ce5-7ead-47e0-abe7-f791025c5e40" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_381a04cf-aa91-45dd-bec2-0ad46368b3c9" xlink:to="loc_us-gaap_InterestRateSwapMember_d2cf9ce5-7ead-47e0-abe7-f791025c5e40" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ForeignCurrencyDerivativesMember_28ed3879-6260-49d4-bbb8-5a88588537a9" xlink:href="gti-20221231.xsd#gti_ForeignCurrencyDerivativesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_381a04cf-aa91-45dd-bec2-0ad46368b3c9" xlink:to="loc_gti_ForeignCurrencyDerivativesMember_28ed3879-6260-49d4-bbb8-5a88588537a9" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_f0ee8b9f-be96-43c4-bc78-c0e996e8e8ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_3288f58e-d643-4e09-84e6-6684be0dfc32" xlink:to="loc_us-gaap_HedgingDesignationAxis_f0ee8b9f-be96-43c4-bc78-c0e996e8e8ad" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_f0ee8b9f-be96-43c4-bc78-c0e996e8e8ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_f0ee8b9f-be96-43c4-bc78-c0e996e8e8ad" xlink:to="loc_us-gaap_HedgingDesignationDomain_f0ee8b9f-be96-43c4-bc78-c0e996e8e8ad_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_36f91ef9-a01f-4ebb-88bb-ea439b0b50f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_f0ee8b9f-be96-43c4-bc78-c0e996e8e8ad" xlink:to="loc_us-gaap_HedgingDesignationDomain_36f91ef9-a01f-4ebb-88bb-ea439b0b50f3" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_fb912a3f-17c5-440c-8b05-b5a96db8a632" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_36f91ef9-a01f-4ebb-88bb-ea439b0b50f3" xlink:to="loc_us-gaap_NondesignatedMember_fb912a3f-17c5-440c-8b05-b5a96db8a632" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/SupplementaryBalanceSheetDetailScheduleOfAnalysisOfTheAllowanceForDoubtfulAccountsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#SupplementaryBalanceSheetDetailScheduleOfAnalysisOfTheAllowanceForDoubtfulAccountsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/SupplementaryBalanceSheetDetailScheduleOfAnalysisOfTheAllowanceForDoubtfulAccountsDetails" xlink:type="extended" id="i1cbda64153c64c06a75d9579829cfd36_SupplementaryBalanceSheetDetailScheduleOfAnalysisOfTheAllowanceForDoubtfulAccountsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_febb4d22-dd27-44be-9ea4-dd04e6d5eba7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1d8bb153-a867-4a53-8088-0bfe1abf12b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_febb4d22-dd27-44be-9ea4-dd04e6d5eba7" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1d8bb153-a867-4a53-8088-0bfe1abf12b8" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_19504713-c158-4bea-b1fb-0231f29b3a39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1d8bb153-a867-4a53-8088-0bfe1abf12b8" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_19504713-c158-4bea-b1fb-0231f29b3a39" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_adb6741b-ca82-4ac7-8ae1-20cf089508a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1d8bb153-a867-4a53-8088-0bfe1abf12b8" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_adb6741b-ca82-4ac7-8ae1-20cf089508a2" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease_777b03f2-c775-442d-b18b-5f7b60da66b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1d8bb153-a867-4a53-8088-0bfe1abf12b8" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease_777b03f2-c775-442d-b18b-5f7b60da66b9" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_4465a9f2-1724-4ac3-996d-7854c75512e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_b858c547-c3f7-44e7-8d5e-e482a66ccbe3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_febb4d22-dd27-44be-9ea4-dd04e6d5eba7" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_b858c547-c3f7-44e7-8d5e-e482a66ccbe3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_4941aee2-6456-4eaa-93c5-7a4d1d890f43" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_b858c547-c3f7-44e7-8d5e-e482a66ccbe3" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_4941aee2-6456-4eaa-93c5-7a4d1d890f43" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_4941aee2-6456-4eaa-93c5-7a4d1d890f43_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_4941aee2-6456-4eaa-93c5-7a4d1d890f43" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_4941aee2-6456-4eaa-93c5-7a4d1d890f43_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_15d0e824-61cc-4561-a54f-ae70ef33e1ff" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_4941aee2-6456-4eaa-93c5-7a4d1d890f43" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_15d0e824-61cc-4561-a54f-ae70ef33e1ff" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_be3dc45c-ca74-4127-9401-e201979fd502" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_15d0e824-61cc-4561-a54f-ae70ef33e1ff" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_be3dc45c-ca74-4127-9401-e201979fd502" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsNarrativeDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsNarrativeDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsNarrativeDetails" xlink:type="extended" id="i8c8e123de8b24c6dba4095943b0580ac_RetirementPlansAndPostretirementBenefitsNarrativeDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_2dbdd4fa-4e76-457f-8a78-932fee2948e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_2dbdd4fa-4e76-457f-8a78-932fee2948e1" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions_7a82ad54-4415-408c-87cf-80ef08effe28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions_7a82ad54-4415-408c-87cf-80ef08effe28" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DefinedBenefitPlanOptionToRemainInPlanPeriod_685c436d-4b58-4f23-aa52-d315aea4cb2f" xlink:href="gti-20221231.xsd#gti_DefinedBenefitPlanOptionToRemainInPlanPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_gti_DefinedBenefitPlanOptionToRemainInPlanPeriod_685c436d-4b58-4f23-aa52-d315aea4cb2f" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_3bddc6af-d365-440a-82bb-ff1ee197e15a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_3bddc6af-d365-440a-82bb-ff1ee197e15a" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_04afb726-5820-499d-8037-98211daa85de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_04afb726-5820-499d-8037-98211daa85de" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_9606286b-deb3-4a05-9b5a-4c93555648db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_9606286b-deb3-4a05-9b5a-4c93555648db" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f77d39bc-7508-4d76-a986-92572e44d704" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f77d39bc-7508-4d76-a986-92572e44d704" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_eeece50c-2161-4191-b362-a35916da75de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_eeece50c-2161-4191-b362-a35916da75de" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_bdd5b2d9-a2db-456e-a3e9-650cc1f46b72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_bdd5b2d9-a2db-456e-a3e9-650cc1f46b72" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DefinedBenefitPlanMaximumSalaryIncrease_4fa19d65-cc2d-4018-a9d6-823941cc8e23" xlink:href="gti-20221231.xsd#gti_DefinedBenefitPlanMaximumSalaryIncrease"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_gti_DefinedBenefitPlanMaximumSalaryIncrease_4fa19d65-cc2d-4018-a9d6-823941cc8e23" xlink:type="arc" order="9"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8c3b7bb3-df05-4338-8cdc-1b1415315731" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_aefa13c9-de5b-48d4-bef4-f74a6f44006a" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8c3b7bb3-df05-4338-8cdc-1b1415315731" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_9ee3683f-3819-44fd-93a2-5f5c8dc49e55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8c3b7bb3-df05-4338-8cdc-1b1415315731" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_9ee3683f-3819-44fd-93a2-5f5c8dc49e55" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_9ee3683f-3819-44fd-93a2-5f5c8dc49e55_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9ee3683f-3819-44fd-93a2-5f5c8dc49e55" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_9ee3683f-3819-44fd-93a2-5f5c8dc49e55_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_557bff5d-065a-4663-9c9a-39e16b10af82" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9ee3683f-3819-44fd-93a2-5f5c8dc49e55" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_557bff5d-065a-4663-9c9a-39e16b10af82" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostemploymentRetirementBenefitsMember_55d09ce0-12fe-4564-8edf-402164a8ea3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PostemploymentRetirementBenefitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_557bff5d-065a-4663-9c9a-39e16b10af82" xlink:to="loc_us-gaap_PostemploymentRetirementBenefitsMember_55d09ce0-12fe-4564-8edf-402164a8ea3d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ba5710e2-ba02-416f-8e28-3c8346e7d391" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8c3b7bb3-df05-4338-8cdc-1b1415315731" xlink:to="loc_dei_LegalEntityAxis_ba5710e2-ba02-416f-8e28-3c8346e7d391" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ba5710e2-ba02-416f-8e28-3c8346e7d391_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ba5710e2-ba02-416f-8e28-3c8346e7d391" xlink:to="loc_dei_EntityDomain_ba5710e2-ba02-416f-8e28-3c8346e7d391_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7042de1c-3a4a-4a87-93ba-8e263903b60a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ba5710e2-ba02-416f-8e28-3c8346e7d391" xlink:to="loc_dei_EntityDomain_7042de1c-3a4a-4a87-93ba-8e263903b60a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_UnionCarbideMember_e40a198c-8057-4bf4-a24c-8a8ae4037377" xlink:href="gti-20221231.xsd#gti_UnionCarbideMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_7042de1c-3a4a-4a87-93ba-8e263903b60a" xlink:to="loc_gti_UnionCarbideMember_e40a198c-8057-4bf4-a24c-8a8ae4037377" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_76a2ab2f-9785-4d86-9ec1-dadc5338e022" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8c3b7bb3-df05-4338-8cdc-1b1415315731" xlink:to="loc_srt_ConsolidatedEntitiesAxis_76a2ab2f-9785-4d86-9ec1-dadc5338e022" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_76a2ab2f-9785-4d86-9ec1-dadc5338e022_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_76a2ab2f-9785-4d86-9ec1-dadc5338e022" xlink:to="loc_srt_ConsolidatedEntitiesDomain_76a2ab2f-9785-4d86-9ec1-dadc5338e022_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_2b3d6aed-925d-434c-af0b-a660f38ffea2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_76a2ab2f-9785-4d86-9ec1-dadc5338e022" xlink:to="loc_srt_ConsolidatedEntitiesDomain_2b3d6aed-925d-434c-af0b-a660f38ffea2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GrafTechInternationalLtdMember_55e9936b-dfa3-4303-837f-a1cd8ae1895e" xlink:href="gti-20221231.xsd#gti_GrafTechInternationalLtdMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2b3d6aed-925d-434c-af0b-a660f38ffea2" xlink:to="loc_gti_GrafTechInternationalLtdMember_55e9936b-dfa3-4303-837f-a1cd8ae1895e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_641815dc-32da-416c-8919-9de41626398e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8c3b7bb3-df05-4338-8cdc-1b1415315731" xlink:to="loc_srt_StatementScenarioAxis_641815dc-32da-416c-8919-9de41626398e" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_641815dc-32da-416c-8919-9de41626398e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_641815dc-32da-416c-8919-9de41626398e" xlink:to="loc_srt_ScenarioUnspecifiedDomain_641815dc-32da-416c-8919-9de41626398e_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_d9bd195d-c5fc-40a3-b85b-319dd1a90104" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_641815dc-32da-416c-8919-9de41626398e" xlink:to="loc_srt_ScenarioUnspecifiedDomain_d9bd195d-c5fc-40a3-b85b-319dd1a90104" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioAdjustmentMember_4ed2440f-3da4-4eec-af86-5fadff83e65a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioAdjustmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_d9bd195d-c5fc-40a3-b85b-319dd1a90104" xlink:to="loc_us-gaap_ScenarioAdjustmentMember_4ed2440f-3da4-4eec-af86-5fadff83e65a" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioPlanMember_b7ee42d4-5dde-4ed2-8293-26aa7c559f0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_d9bd195d-c5fc-40a3-b85b-319dd1a90104" xlink:to="loc_us-gaap_ScenarioPlanMember_b7ee42d4-5dde-4ed2-8293-26aa7c559f0e" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsComponentsOfConsolidatedNetPensionCostsRetirementPlansDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsComponentsOfConsolidatedNetPensionCostsRetirementPlansDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsComponentsOfConsolidatedNetPensionCostsRetirementPlansDetails" xlink:type="extended" id="ie873865ee50741a1a40f6b131479fbaf_RetirementPlansAndPostretirementBenefitsComponentsOfConsolidatedNetPensionCostsRetirementPlansDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_d38bf932-b16f-4357-aa93-3616558f61e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_d38bf932-b16f-4357-aa93-3616558f61e3" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_3ca88c95-8d28-4404-9d08-3ae7985e3ccb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_3ca88c95-8d28-4404-9d08-3ae7985e3ccb" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6ed20615-a812-45e1-a3d2-c4551467e928" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6ed20615-a812-45e1-a3d2-c4551467e928" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_02f0a603-bbef-412d-a600-6ef3141f4ac6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_02f0a603-bbef-412d-a600-6ef3141f4ac6" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4e0f5648-2dfa-4079-9f77-398f31f23202" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4e0f5648-2dfa-4079-9f77-398f31f23202" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList_ec292806-aecd-405b-b950-9c971bd778a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList_ec292806-aecd-405b-b950-9c971bd778a8" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_44eb496c-ee59-4646-9cd6-3cca0595bb30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60143e83-d427-434f-a3da-dd2fd2d70416" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_44eb496c-ee59-4646-9cd6-3cca0595bb30" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_273997b9-9fb4-44a4-a4a7-b4b9d85b887e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_44eb496c-ee59-4646-9cd6-3cca0595bb30" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_273997b9-9fb4-44a4-a4a7-b4b9d85b887e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_273997b9-9fb4-44a4-a4a7-b4b9d85b887e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_273997b9-9fb4-44a4-a4a7-b4b9d85b887e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_273997b9-9fb4-44a4-a4a7-b4b9d85b887e_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_70e29b60-1183-4c5f-9453-913977ff6b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_273997b9-9fb4-44a4-a4a7-b4b9d85b887e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_70e29b60-1183-4c5f-9453-913977ff6b2b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_3dd26994-a88f-41ba-9f75-9b439732ade4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_70e29b60-1183-4c5f-9453-913977ff6b2b" xlink:to="loc_us-gaap_DomesticPlanMember_3dd26994-a88f-41ba-9f75-9b439732ade4" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_df806cdb-6739-49b5-9770-0c8843c3ebbf" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_3dd26994-a88f-41ba-9f75-9b439732ade4" xlink:to="loc_country_US_df806cdb-6739-49b5-9770-0c8843c3ebbf" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_fb94af01-bd1c-4d0e-84da-c44bc23d641d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_70e29b60-1183-4c5f-9453-913977ff6b2b" xlink:to="loc_us-gaap_ForeignPlanMember_fb94af01-bd1c-4d0e-84da-c44bc23d641d" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsReconciliationOfPensionPlansBenefitObligationsFairValueOfAssetsRetirementPlansDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsReconciliationOfPensionPlansBenefitObligationsFairValueOfAssetsRetirementPlansDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsReconciliationOfPensionPlansBenefitObligationsFairValueOfAssetsRetirementPlansDetails" xlink:type="extended" id="i96fa84fb81b645d28074be341650885e_RetirementPlansAndPostretirementBenefitsReconciliationOfPensionPlansBenefitObligationsFairValueOfAssetsRetirementPlansDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_7b1c2ce3-c111-4c61-90ac-92af87250c64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_7b1c2ce3-c111-4c61-90ac-92af87250c64" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_08af48cf-80aa-4492-b559-339b5a548945" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_08af48cf-80aa-4492-b559-339b5a548945" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_ef20fd4b-990b-4f56-867f-8ce4aec5387b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_ef20fd4b-990b-4f56-867f-8ce4aec5387b" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_ff336c2f-573c-4406-9092-39fc9bff8378" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_ff336c2f-573c-4406-9092-39fc9bff8378" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_30f3f56b-2648-47c2-a7a3-67ccaeedc39a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_30f3f56b-2648-47c2-a7a3-67ccaeedc39a" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_5f5d665b-8ea5-43c3-8e08-5cff1dfe8929" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_5f5d665b-8ea5-43c3-8e08-5cff1dfe8929" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanOtherChanges_097c1f30-63a0-49b6-b24f-7b244b8c08a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanOtherChanges"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_025ef6da-3a2d-43ff-ace8-a20510cef0f1" xlink:to="loc_us-gaap_DefinedBenefitPlanOtherChanges_097c1f30-63a0-49b6-b24f-7b244b8c08a5" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_a362004d-890f-4958-a235-bc786e3de71b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a45caeda-f92d-419a-b496-d26d3b443bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a45caeda-f92d-419a-b496-d26d3b443bb3" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_f3c6ae4a-f38a-4315-9d8c-a5f5147dc473" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_f3c6ae4a-f38a-4315-9d8c-a5f5147dc473" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_c1469c4e-8a34-4bef-aa5f-95838fbc8b66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_c1469c4e-8a34-4bef-aa5f-95838fbc8b66" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_6b6630b4-3341-4b85-a8e2-22ebfd15ad92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_6b6630b4-3341-4b85-a8e2-22ebfd15ad92" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_a2f419ad-67c0-45de-8e9e-3941a38acefe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_a2f419ad-67c0-45de-8e9e-3941a38acefe" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease_8a671004-f572-4f72-a6b9-101db548ad4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_aad9d8a6-5084-4340-afda-5a9fc099abd7" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease_8a671004-f572-4f72-a6b9-101db548ad4e" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_e9cb7bf4-62bb-4481-8d88-27c9ece5f175" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_b8dab21f-6431-494e-87cb-0c793b04a7cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_b8dab21f-6431-494e-87cb-0c793b04a7cd" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_3c26d350-b6cc-48bc-a023-6836362348eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_3c26d350-b6cc-48bc-a023-6836362348eb" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_11364b3e-4547-4e4c-a124-e7f67087959b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_11364b3e-4547-4e4c-a124-e7f67087959b" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_fbaadaaa-80e6-4294-8ada-ef4e7e46346a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_fbaadaaa-80e6-4294-8ada-ef4e7e46346a" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_92ba927e-b126-405d-abe5-3a220dc34a59" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_96fffe13-2549-44e2-9a73-3f98529276aa" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_92ba927e-b126-405d-abe5-3a220dc34a59" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_4064eaab-7dcc-4ea0-a235-5fffba2a9c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_92ba927e-b126-405d-abe5-3a220dc34a59" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_4064eaab-7dcc-4ea0-a235-5fffba2a9c9c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_4064eaab-7dcc-4ea0-a235-5fffba2a9c9c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_4064eaab-7dcc-4ea0-a235-5fffba2a9c9c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_4064eaab-7dcc-4ea0-a235-5fffba2a9c9c_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_af83df40-362a-440f-af7c-754946232173" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_4064eaab-7dcc-4ea0-a235-5fffba2a9c9c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_af83df40-362a-440f-af7c-754946232173" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_4fa8163d-7377-443c-b243-ec013a8bc302" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_af83df40-362a-440f-af7c-754946232173" xlink:to="loc_us-gaap_DomesticPlanMember_4fa8163d-7377-443c-b243-ec013a8bc302" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_eb421d65-704e-4362-b9bf-9a884025d662" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_4fa8163d-7377-443c-b243-ec013a8bc302" xlink:to="loc_country_US_eb421d65-704e-4362-b9bf-9a884025d662" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_8061c7e5-679f-4b5f-a98f-4ac502ca7b52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_af83df40-362a-440f-af7c-754946232173" xlink:to="loc_us-gaap_ForeignPlanMember_8061c7e5-679f-4b5f-a98f-4ac502ca7b52" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsFairAssetValuesOfPlanAssetsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsFairAssetValuesOfPlanAssetsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsFairAssetValuesOfPlanAssetsDetails" xlink:type="extended" id="i6e5c2b811a6b40bea1f5e99c51e27c57_RetirementPlansAndPostretirementBenefitsFairAssetValuesOfPlanAssetsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9306be9d-fbd3-402f-bdbd-3c051084d7cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_73ad23d5-6eb1-4265-b5b5-2d5c1fadb888" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9306be9d-fbd3-402f-bdbd-3c051084d7cc" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_73ad23d5-6eb1-4265-b5b5-2d5c1fadb888" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9c97c5bf-23e9-44e3-998c-4054b13c06d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9306be9d-fbd3-402f-bdbd-3c051084d7cc" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9c97c5bf-23e9-44e3-998c-4054b13c06d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_0066a805-e624-48a1-9e7f-f8b3a014d4d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9c97c5bf-23e9-44e3-998c-4054b13c06d2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_0066a805-e624-48a1-9e7f-f8b3a014d4d2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_0066a805-e624-48a1-9e7f-f8b3a014d4d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_0066a805-e624-48a1-9e7f-f8b3a014d4d2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_0066a805-e624-48a1-9e7f-f8b3a014d4d2_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_6ab62f7f-6420-4767-b4f6-445143110ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_0066a805-e624-48a1-9e7f-f8b3a014d4d2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_6ab62f7f-6420-4767-b4f6-445143110ca6" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_bf1c8004-9776-46e1-8589-3cdeacde616c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_6ab62f7f-6420-4767-b4f6-445143110ca6" xlink:to="loc_us-gaap_DomesticPlanMember_bf1c8004-9776-46e1-8589-3cdeacde616c" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_f397811d-e449-4e8b-9249-30443ed65a24" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_bf1c8004-9776-46e1-8589-3cdeacde616c" xlink:to="loc_country_US_f397811d-e449-4e8b-9249-30443ed65a24" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_b6d93160-bfbc-4467-89f9-7e09c6b95e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_6ab62f7f-6420-4767-b4f6-445143110ca6" xlink:to="loc_us-gaap_ForeignPlanMember_b6d93160-bfbc-4467-89f9-7e09c6b95e1b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3780bab3-fc92-44a3-9a68-c06b4a46e895" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9c97c5bf-23e9-44e3-998c-4054b13c06d2" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3780bab3-fc92-44a3-9a68-c06b4a46e895" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3780bab3-fc92-44a3-9a68-c06b4a46e895_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3780bab3-fc92-44a3-9a68-c06b4a46e895" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3780bab3-fc92-44a3-9a68-c06b4a46e895_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3780bab3-fc92-44a3-9a68-c06b4a46e895" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_55f54828-f04e-4f3d-8a41-4992d2f665c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_55f54828-f04e-4f3d-8a41-4992d2f665c3" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_10aeadea-d16a-4f01-8f25-b0719ea1400b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_10aeadea-d16a-4f01-8f25-b0719ea1400b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_7206fe57-710b-4b60-b6ea-ff4204640b79" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_7206fe57-710b-4b60-b6ea-ff4204640b79" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel12And3Member_568f33ec-ea5b-4cf0-bb55-e01f8e54fd24" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel12And3Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:to="loc_us-gaap_FairValueInputsLevel12And3Member_568f33ec-ea5b-4cf0-bb55-e01f8e54fd24" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_1b272727-8fdd-4ca3-81e3-7533f3312988" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7849a389-c8a1-4f92-9afc-6b5ea9997cb2" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_1b272727-8fdd-4ca3-81e3-7533f3312988" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_12e6ad57-1d5a-4389-b49f-08cfef32b4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9c97c5bf-23e9-44e3-998c-4054b13c06d2" xlink:to="loc_us-gaap_FinancialInstrumentAxis_12e6ad57-1d5a-4389-b49f-08cfef32b4c6" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_12e6ad57-1d5a-4389-b49f-08cfef32b4c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_12e6ad57-1d5a-4389-b49f-08cfef32b4c6" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_12e6ad57-1d5a-4389-b49f-08cfef32b4c6_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_667f5c8d-d174-43cd-a0c2-bd46d38b9086" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_12e6ad57-1d5a-4389-b49f-08cfef32b4c6" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_667f5c8d-d174-43cd-a0c2-bd46d38b9086" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_6138b17e-a779-46cb-91d6-bdeef270842e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_667f5c8d-d174-43cd-a0c2-bd46d38b9086" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_6138b17e-a779-46cb-91d6-bdeef270842e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_6c9b34ac-c29c-4071-a31c-cadc063b937b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignGovernmentDebtMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_667f5c8d-d174-43cd-a0c2-bd46d38b9086" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_6c9b34ac-c29c-4071-a31c-cadc063b937b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_FixedInsuranceContractsMember_5d4aee35-723b-4af4-8c16-31d9f801e2b2" xlink:href="gti-20221231.xsd#gti_FixedInsuranceContractsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_667f5c8d-d174-43cd-a0c2-bd46d38b9086" xlink:to="loc_gti_FixedInsuranceContractsMember_5d4aee35-723b-4af4-8c16-31d9f801e2b2" xlink:type="arc" order="2"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsFairValueHierarchyAssetsAtFairValueDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsFairValueHierarchyAssetsAtFairValueDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsFairValueHierarchyAssetsAtFairValueDetails" xlink:type="extended" id="if993f18c4b914a38baea35700e222e83_RetirementPlansAndPostretirementBenefitsFairValueHierarchyAssetsAtFairValueDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6835f3d5-dc25-44fa-9d5a-39850208aaee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_9cd0bc60-8101-4bfd-ad35-bb42f9f32689" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6835f3d5-dc25-44fa-9d5a-39850208aaee" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_9cd0bc60-8101-4bfd-ad35-bb42f9f32689" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_a71dbcab-9042-4158-8e35-84e148532240" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6835f3d5-dc25-44fa-9d5a-39850208aaee" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_a71dbcab-9042-4158-8e35-84e148532240" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_bbef277c-d8dd-4bfa-94e3-d281cf6b1710" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6835f3d5-dc25-44fa-9d5a-39850208aaee" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_bbef277c-d8dd-4bfa-94e3-d281cf6b1710" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_d04ad9cc-b408-4412-8115-1c9668febe12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_a7b73a79-a0f9-470a-8ea0-512d13aeef1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6835f3d5-dc25-44fa-9d5a-39850208aaee" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_a7b73a79-a0f9-470a-8ea0-512d13aeef1e" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8d9e0a43-20dd-4535-ae61-752b954646af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6835f3d5-dc25-44fa-9d5a-39850208aaee" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8d9e0a43-20dd-4535-ae61-752b954646af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_224e0373-1a01-4ab3-ae0e-df521de114a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8d9e0a43-20dd-4535-ae61-752b954646af" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_224e0373-1a01-4ab3-ae0e-df521de114a1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_224e0373-1a01-4ab3-ae0e-df521de114a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_224e0373-1a01-4ab3-ae0e-df521de114a1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_224e0373-1a01-4ab3-ae0e-df521de114a1_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_b65d7fbe-8a62-4c5c-800e-ee888b18517a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_224e0373-1a01-4ab3-ae0e-df521de114a1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_b65d7fbe-8a62-4c5c-800e-ee888b18517a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_561f6686-0aeb-4f6b-b94b-7910253f0c84" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_b65d7fbe-8a62-4c5c-800e-ee888b18517a" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_561f6686-0aeb-4f6b-b94b-7910253f0c84" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_3be37804-bc2d-4b58-b7a2-84dee0a941da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8d9e0a43-20dd-4535-ae61-752b954646af" xlink:to="loc_us-gaap_FinancialInstrumentAxis_3be37804-bc2d-4b58-b7a2-84dee0a941da" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3be37804-bc2d-4b58-b7a2-84dee0a941da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3be37804-bc2d-4b58-b7a2-84dee0a941da" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3be37804-bc2d-4b58-b7a2-84dee0a941da_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a5d0ab0b-99eb-4f23-8969-0bd9176200a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3be37804-bc2d-4b58-b7a2-84dee0a941da" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a5d0ab0b-99eb-4f23-8969-0bd9176200a1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_FixedInsuranceContractsMember_48f481f5-61ae-45f4-b96d-7a058084a12f" xlink:href="gti-20221231.xsd#gti_FixedInsuranceContractsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a5d0ab0b-99eb-4f23-8969-0bd9176200a1" xlink:to="loc_gti_FixedInsuranceContractsMember_48f481f5-61ae-45f4-b96d-7a058084a12f" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_54d2f8ed-ed12-468c-babb-4dce44643a47" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8d9e0a43-20dd-4535-ae61-752b954646af" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_54d2f8ed-ed12-468c-babb-4dce44643a47" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54d2f8ed-ed12-468c-babb-4dce44643a47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_54d2f8ed-ed12-468c-babb-4dce44643a47" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54d2f8ed-ed12-468c-babb-4dce44643a47_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f8aeccc6-72e6-46b9-b1c0-fc2eb71f6e19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_54d2f8ed-ed12-468c-babb-4dce44643a47" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f8aeccc6-72e6-46b9-b1c0-fc2eb71f6e19" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_0e81b108-de9f-4d2a-9f6b-dcf46cef21fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f8aeccc6-72e6-46b9-b1c0-fc2eb71f6e19" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_0e81b108-de9f-4d2a-9f6b-dcf46cef21fe" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsRetirementPlanWeightedAverageAssetAllocationsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsRetirementPlanWeightedAverageAssetAllocationsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsRetirementPlanWeightedAverageAssetAllocationsDetails" xlink:type="extended" id="i3ff686334b35417185b43419f27448ce_RetirementPlansAndPostretirementBenefitsRetirementPlanWeightedAverageAssetAllocationsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_86aad982-3e94-47ee-bb9a-8fea9405b0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_29e707e2-dc8c-43bd-b31f-c31a2aab7a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_86aad982-3e94-47ee-bb9a-8fea9405b0bd" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_29e707e2-dc8c-43bd-b31f-c31a2aab7a8c" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce22a328-3f84-49ba-aa2e-da34d0d7fe22" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_86aad982-3e94-47ee-bb9a-8fea9405b0bd" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce22a328-3f84-49ba-aa2e-da34d0d7fe22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_bacaef67-39cd-46dc-af80-b96a1dc8f818" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce22a328-3f84-49ba-aa2e-da34d0d7fe22" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_bacaef67-39cd-46dc-af80-b96a1dc8f818" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_bacaef67-39cd-46dc-af80-b96a1dc8f818_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_bacaef67-39cd-46dc-af80-b96a1dc8f818" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_bacaef67-39cd-46dc-af80-b96a1dc8f818_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_e914285c-f229-46a7-83d8-2511b53f82de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_bacaef67-39cd-46dc-af80-b96a1dc8f818" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_e914285c-f229-46a7-83d8-2511b53f82de" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_4ace5e7b-05b4-4c58-af16-f1a79ae1f103" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_e914285c-f229-46a7-83d8-2511b53f82de" xlink:to="loc_us-gaap_DomesticPlanMember_4ace5e7b-05b4-4c58-af16-f1a79ae1f103" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_8cd7159f-3732-407a-98f7-19b33d221d54" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_4ace5e7b-05b4-4c58-af16-f1a79ae1f103" xlink:to="loc_country_US_8cd7159f-3732-407a-98f7-19b33d221d54" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_a3396dc9-2b6c-4470-bc72-80870eeba4f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_e914285c-f229-46a7-83d8-2511b53f82de" xlink:to="loc_us-gaap_ForeignPlanMember_a3396dc9-2b6c-4470-bc72-80870eeba4f4" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7d443a17-7eb6-46f9-a0cd-a1436651fa83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce22a328-3f84-49ba-aa2e-da34d0d7fe22" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7d443a17-7eb6-46f9-a0cd-a1436651fa83" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_7d443a17-7eb6-46f9-a0cd-a1436651fa83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanAssetCategoriesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7d443a17-7eb6-46f9-a0cd-a1436651fa83" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_7d443a17-7eb6-46f9-a0cd-a1436651fa83_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_a07d9767-8f32-4f36-81ac-38e2e0b206b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanAssetCategoriesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7d443a17-7eb6-46f9-a0cd-a1436651fa83" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_a07d9767-8f32-4f36-81ac-38e2e0b206b9" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_051ede27-610b-467c-a351-0194d3bf53f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_a07d9767-8f32-4f36-81ac-38e2e0b206b9" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_051ede27-610b-467c-a351-0194d3bf53f0" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_6fe88cc6-ccac-46ee-aea7-c581c8d64cd5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FixedIncomeSecuritiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_a07d9767-8f32-4f36-81ac-38e2e0b206b9" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_6fe88cc6-ccac-46ee-aea7-c581c8d64cd5" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsPensionPlansWithAnAccumulatedBenefitObligationInExcessOfPlanAssetsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsPensionPlansWithAnAccumulatedBenefitObligationInExcessOfPlanAssetsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsPensionPlansWithAnAccumulatedBenefitObligationInExcessOfPlanAssetsDetails" xlink:type="extended" id="ic41ea7fd62da4a67963d2f193d6e6d1c_RetirementPlansAndPostretirementBenefitsPensionPlansWithAnAccumulatedBenefitObligationInExcessOfPlanAssetsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6b00c41c-171b-4788-a3fb-351b821e4d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_2caf2842-cced-4b21-b56b-a495d327870d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6b00c41c-171b-4788-a3fb-351b821e4d7b" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_2caf2842-cced-4b21-b56b-a495d327870d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_8ffdd32e-7af1-4620-bdd7-cba7adbc84e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_2caf2842-cced-4b21-b56b-a495d327870d" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_8ffdd32e-7af1-4620-bdd7-cba7adbc84e3" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_61e5cc9a-25aa-46b0-9274-105a904c2693" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_2caf2842-cced-4b21-b56b-a495d327870d" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_61e5cc9a-25aa-46b0-9274-105a904c2693" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_7e4980a4-9afd-4518-919b-ec0be69cc8e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6b00c41c-171b-4788-a3fb-351b821e4d7b" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_7e4980a4-9afd-4518-919b-ec0be69cc8e1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_73ebaf0a-3106-4866-9652-45d0c3403905" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_7e4980a4-9afd-4518-919b-ec0be69cc8e1" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_73ebaf0a-3106-4866-9652-45d0c3403905" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_73ebaf0a-3106-4866-9652-45d0c3403905_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_73ebaf0a-3106-4866-9652-45d0c3403905" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_73ebaf0a-3106-4866-9652-45d0c3403905_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_4cb47431-a373-4224-92a0-f5c6f58ee388" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_73ebaf0a-3106-4866-9652-45d0c3403905" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_4cb47431-a373-4224-92a0-f5c6f58ee388" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_d87a7362-345c-4e7c-a83e-68ba43b3f8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4cb47431-a373-4224-92a0-f5c6f58ee388" xlink:to="loc_us-gaap_DomesticPlanMember_d87a7362-345c-4e7c-a83e-68ba43b3f8a7" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_9100ebdd-6fb5-4d04-afa4-4844ae7f989c" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_d87a7362-345c-4e7c-a83e-68ba43b3f8a7" xlink:to="loc_country_US_9100ebdd-6fb5-4d04-afa4-4844ae7f989c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_63cbf37b-c227-46b8-9704-3104e571e964" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4cb47431-a373-4224-92a0-f5c6f58ee388" xlink:to="loc_us-gaap_ForeignPlanMember_63cbf37b-c227-46b8-9704-3104e571e964" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsPensionPlansWithProjectedBenefitObligationInExcessOfPlanAssetsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsPensionPlansWithProjectedBenefitObligationInExcessOfPlanAssetsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsPensionPlansWithProjectedBenefitObligationInExcessOfPlanAssetsDetails" xlink:type="extended" id="i395c910321a84495a6b5fcdffef18560_RetirementPlansAndPostretirementBenefitsPensionPlansWithProjectedBenefitObligationInExcessOfPlanAssetsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a353761b-8efe-4443-b663-610707564e81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_f6841854-1926-4b05-aaea-e4c61814df28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a353761b-8efe-4443-b663-610707564e81" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_f6841854-1926-4b05-aaea-e4c61814df28" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_891869a6-8ecf-458a-9727-69b02d1c1942" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a353761b-8efe-4443-b663-610707564e81" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_891869a6-8ecf-458a-9727-69b02d1c1942" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_be1a1ed1-43d4-4cd0-b55d-ee66f4c3d5ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a353761b-8efe-4443-b663-610707564e81" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_be1a1ed1-43d4-4cd0-b55d-ee66f4c3d5ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_3f1215d5-dcb0-4cc6-b6ca-8f27ee353e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_be1a1ed1-43d4-4cd0-b55d-ee66f4c3d5ae" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_3f1215d5-dcb0-4cc6-b6ca-8f27ee353e3e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_3f1215d5-dcb0-4cc6-b6ca-8f27ee353e3e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_3f1215d5-dcb0-4cc6-b6ca-8f27ee353e3e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_3f1215d5-dcb0-4cc6-b6ca-8f27ee353e3e_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_a868aba9-2f19-4814-a5d0-5df85506866e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_3f1215d5-dcb0-4cc6-b6ca-8f27ee353e3e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_a868aba9-2f19-4814-a5d0-5df85506866e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_10d35c19-acdf-4ec4-81fb-4ae5a6c12987" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_a868aba9-2f19-4814-a5d0-5df85506866e" xlink:to="loc_us-gaap_DomesticPlanMember_10d35c19-acdf-4ec4-81fb-4ae5a6c12987" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_e41ec884-4ecc-4db8-9637-d853bdeac239" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_10d35c19-acdf-4ec4-81fb-4ae5a6c12987" xlink:to="loc_country_US_e41ec884-4ecc-4db8-9637-d853bdeac239" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_46c18610-6d03-4856-98ac-67a09cef88a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_a868aba9-2f19-4814-a5d0-5df85506866e" xlink:to="loc_us-gaap_ForeignPlanMember_46c18610-6d03-4856-98ac-67a09cef88a2" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsProjectedFuturePensionPlanCashFlowByYearDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsProjectedFuturePensionPlanCashFlowByYearDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsProjectedFuturePensionPlanCashFlowByYearDetails" xlink:type="extended" id="i421e8f1a1990441d8a3bc866b6f15607_RetirementPlansAndPostretirementBenefitsProjectedFuturePensionPlanCashFlowByYearDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear_51a073fb-fa5b-4e1d-9df5-d8a601cc1383" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear_51a073fb-fa5b-4e1d-9df5-d8a601cc1383" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear_7f12d4ad-2fe4-4515-adbb-4dc29dde6253" xlink:href="gti-20221231.xsd#gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear_7f12d4ad-2fe4-4515-adbb-4dc29dde6253" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_b72311be-2945-48a5-84f8-b31244b03106" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_b72311be-2945-48a5-84f8-b31244b03106" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_f6556dbf-071a-4570-8a0d-82fec9822ece" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_f6556dbf-071a-4570-8a0d-82fec9822ece" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_0d4918e5-c467-4838-a14c-d14097dc8c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_0d4918e5-c467-4838-a14c-d14097dc8c4e" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_48ee5514-a026-4be5-97b6-53d719784afa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_48ee5514-a026-4be5-97b6-53d719784afa" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_b4e83e0f-6dc5-42bc-822f-f23bb92feb82" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_b4e83e0f-6dc5-42bc-822f-f23bb92feb82" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_385cea40-d6c0-4e14-b74f-1096457ac35c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_385cea40-d6c0-4e14-b74f-1096457ac35c" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_39327a17-4f89-4024-8c25-fd3de35b4299" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_36927cc7-2423-4455-9a34-120fc6c33797" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_39327a17-4f89-4024-8c25-fd3de35b4299" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_3221db58-c93e-4a04-9d11-99ec35d6b016" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_39327a17-4f89-4024-8c25-fd3de35b4299" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_3221db58-c93e-4a04-9d11-99ec35d6b016" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_3221db58-c93e-4a04-9d11-99ec35d6b016_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_3221db58-c93e-4a04-9d11-99ec35d6b016" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_3221db58-c93e-4a04-9d11-99ec35d6b016_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_96b2a204-e11c-4e8c-9d36-dcf55a2c701d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_3221db58-c93e-4a04-9d11-99ec35d6b016" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_96b2a204-e11c-4e8c-9d36-dcf55a2c701d" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_36ed2152-0882-4165-a345-d8e5e3a5b4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_96b2a204-e11c-4e8c-9d36-dcf55a2c701d" xlink:to="loc_us-gaap_DomesticPlanMember_36ed2152-0882-4165-a345-d8e5e3a5b4c9" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_a1052f5f-cc28-4257-9952-34ec614973a8" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_36ed2152-0882-4165-a345-d8e5e3a5b4c9" xlink:to="loc_country_US_a1052f5f-cc28-4257-9952-34ec614973a8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_ca59a725-f7bd-4597-9ca1-dbecafbdc0f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_96b2a204-e11c-4e8c-9d36-dcf55a2c701d" xlink:to="loc_us-gaap_ForeignPlanMember_ca59a725-f7bd-4597-9ca1-dbecafbdc0f1" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsComponentsOfNetPostretirementCostsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsComponentsOfNetPostretirementCostsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsComponentsOfNetPostretirementCostsDetails" xlink:type="extended" id="i046b5633ad7943b2bb32d6bb6abe2291_RetirementPlansAndPostretirementBenefitsComponentsOfNetPostretirementCostsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8d101299-16fb-46cc-a240-36a54c509828" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_8bb207e2-7724-4abe-afc8-1c4eca5ab2df" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8d101299-16fb-46cc-a240-36a54c509828" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_8bb207e2-7724-4abe-afc8-1c4eca5ab2df" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_33431b8a-fe29-4e64-8230-c6d151134e39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8d101299-16fb-46cc-a240-36a54c509828" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_33431b8a-fe29-4e64-8230-c6d151134e39" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18f819fb-5c62-4fda-ae78-5eccb4eb4f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8d101299-16fb-46cc-a240-36a54c509828" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18f819fb-5c62-4fda-ae78-5eccb4eb4f7a" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0743c7be-6e75-4cf8-a0a6-ec32097d8b94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8d101299-16fb-46cc-a240-36a54c509828" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0743c7be-6e75-4cf8-a0a6-ec32097d8b94" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_8065a4d0-4a0c-4704-9ea4-41b7ce7f05da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0743c7be-6e75-4cf8-a0a6-ec32097d8b94" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_8065a4d0-4a0c-4704-9ea4-41b7ce7f05da" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8065a4d0-4a0c-4704-9ea4-41b7ce7f05da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8065a4d0-4a0c-4704-9ea4-41b7ce7f05da" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8065a4d0-4a0c-4704-9ea4-41b7ce7f05da_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_78ccf685-dc45-4db1-a1ae-645b24e61003" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8065a4d0-4a0c-4704-9ea4-41b7ce7f05da" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_78ccf685-dc45-4db1-a1ae-645b24e61003" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostemploymentRetirementBenefitsMember_b8c277b1-5e33-4eba-9cb8-d361db4f4997" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PostemploymentRetirementBenefitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_78ccf685-dc45-4db1-a1ae-645b24e61003" xlink:to="loc_us-gaap_PostemploymentRetirementBenefitsMember_b8c277b1-5e33-4eba-9cb8-d361db4f4997" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_fa9f899e-2f20-4716-94b0-23873b664f70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_0743c7be-6e75-4cf8-a0a6-ec32097d8b94" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_fa9f899e-2f20-4716-94b0-23873b664f70" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_fa9f899e-2f20-4716-94b0-23873b664f70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_fa9f899e-2f20-4716-94b0-23873b664f70" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_fa9f899e-2f20-4716-94b0-23873b664f70_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_90e3f5f6-3c67-4b99-9b37-cf261b30e871" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_fa9f899e-2f20-4716-94b0-23873b664f70" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_90e3f5f6-3c67-4b99-9b37-cf261b30e871" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_ace3f841-febb-4f43-8655-23c3ba5a0a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_90e3f5f6-3c67-4b99-9b37-cf261b30e871" xlink:to="loc_us-gaap_ForeignPlanMember_ace3f841-febb-4f43-8655-23c3ba5a0a4e" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsFairValueOfAssetsOfAndTheFundedStatusOfPostretirementPlansDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsFairValueOfAssetsOfAndTheFundedStatusOfPostretirementPlansDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsFairValueOfAssetsOfAndTheFundedStatusOfPostretirementPlansDetails" xlink:type="extended" id="iafb41beee3134e599830656d9bfa2948_RetirementPlansAndPostretirementBenefitsFairValueOfAssetsOfAndTheFundedStatusOfPostretirementPlansDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_14d1c043-ac75-4dff-8226-05ab5a2234db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_14d1c043-ac75-4dff-8226-05ab5a2234db" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_3d0cc1b7-4684-42df-ab38-dc6a6b11de99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_14d1c043-ac75-4dff-8226-05ab5a2234db" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_3d0cc1b7-4684-42df-ab38-dc6a6b11de99" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_c336daf4-3f13-4189-b4d3-cef76e2bd3af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_14d1c043-ac75-4dff-8226-05ab5a2234db" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_c336daf4-3f13-4189-b4d3-cef76e2bd3af" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_8e9c495b-86e0-499e-aad7-61ec5a40d494" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_14d1c043-ac75-4dff-8226-05ab5a2234db" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_8e9c495b-86e0-499e-aad7-61ec5a40d494" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_0b73b207-5865-46bc-a5ac-70237e30ef52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_14d1c043-ac75-4dff-8226-05ab5a2234db" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_0b73b207-5865-46bc-a5ac-70237e30ef52" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_ea984cf1-dee5-46c6-a859-e76b9803bb23" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_72116079-a63f-4727-9a7e-5326d25b7dc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_72116079-a63f-4727-9a7e-5326d25b7dc8" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_fd12ae4d-d263-4adb-818b-c810e830f3ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_72116079-a63f-4727-9a7e-5326d25b7dc8" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_fd12ae4d-d263-4adb-818b-c810e830f3ef" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_e1fea131-44ae-4f55-af42-36d7c4afb7cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_72116079-a63f-4727-9a7e-5326d25b7dc8" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_e1fea131-44ae-4f55-af42-36d7c4afb7cb" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_1aebbc86-0fed-42d2-9100-47716f4501b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_6252c54f-5d40-4823-a402-fd9e213caa7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_6252c54f-5d40-4823-a402-fd9e213caa7b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_a9a9fa58-7615-4315-b45b-5daad9f63de5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_a9a9fa58-7615-4315-b45b-5daad9f63de5" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_dfff16a7-2aa7-4b91-9f7d-94e05991729a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_dfff16a7-2aa7-4b91-9f7d-94e05991729a" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_048f6010-12c8-44e8-94d9-754a781738b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_048f6010-12c8-44e8-94d9-754a781738b3" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bbf61a2d-971a-4cd3-8d1e-133bb180ddbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_05ad5ee1-470a-4a02-8a77-7eed6be6495e" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bbf61a2d-971a-4cd3-8d1e-133bb180ddbe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_5060cfab-f753-4ecb-a647-a74dfa88e493" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bbf61a2d-971a-4cd3-8d1e-133bb180ddbe" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_5060cfab-f753-4ecb-a647-a74dfa88e493" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5060cfab-f753-4ecb-a647-a74dfa88e493_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_5060cfab-f753-4ecb-a647-a74dfa88e493" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5060cfab-f753-4ecb-a647-a74dfa88e493_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_01ccbae6-0813-4b14-85f6-e6919c8f462c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_5060cfab-f753-4ecb-a647-a74dfa88e493" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_01ccbae6-0813-4b14-85f6-e6919c8f462c" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostemploymentRetirementBenefitsMember_5205a5c3-300c-4cb9-b71b-18e6bf3b812a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PostemploymentRetirementBenefitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_01ccbae6-0813-4b14-85f6-e6919c8f462c" xlink:to="loc_us-gaap_PostemploymentRetirementBenefitsMember_5205a5c3-300c-4cb9-b71b-18e6bf3b812a" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_2f077d6e-ab00-420a-907a-ef9aa04b31b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bbf61a2d-971a-4cd3-8d1e-133bb180ddbe" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_2f077d6e-ab00-420a-907a-ef9aa04b31b9" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_2f077d6e-ab00-420a-907a-ef9aa04b31b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_2f077d6e-ab00-420a-907a-ef9aa04b31b9" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_2f077d6e-ab00-420a-907a-ef9aa04b31b9_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_3e64e0dd-2389-4c23-9015-23127d7a52aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_2f077d6e-ab00-420a-907a-ef9aa04b31b9" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_3e64e0dd-2389-4c23-9015-23127d7a52aa" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_a793ea7c-1c7f-4b9a-bb55-0e373e19c0e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_3e64e0dd-2389-4c23-9015-23127d7a52aa" xlink:to="loc_us-gaap_DomesticPlanMember_a793ea7c-1c7f-4b9a-bb55-0e373e19c0e8" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_69745c2c-c358-47dc-bf1f-288fec7450a2" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_a793ea7c-1c7f-4b9a-bb55-0e373e19c0e8" xlink:to="loc_country_US_69745c2c-c358-47dc-bf1f-288fec7450a2" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_8eb0984c-1cbb-4390-992e-3683b9a85734" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_3e64e0dd-2389-4c23-9015-23127d7a52aa" xlink:to="loc_us-gaap_ForeignPlanMember_8eb0984c-1cbb-4390-992e-3683b9a85734" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails" xlink:type="extended" id="i23e0e36888df4694915f51a491b7108d_RetirementPlansAndPostretirementBenefitsOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_85e30a4f-7b3f-42ee-8785-ef7a1f4ac191" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_307225d1-9eea-4987-a8a1-81d51f258329" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_85e30a4f-7b3f-42ee-8785-ef7a1f4ac191" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_307225d1-9eea-4987-a8a1-81d51f258329" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_d3db623c-38ec-4f79-979f-39dc59376a87" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_307225d1-9eea-4987-a8a1-81d51f258329" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_d3db623c-38ec-4f79-979f-39dc59376a87" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_d3db623c-38ec-4f79-979f-39dc59376a87_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_d3db623c-38ec-4f79-979f-39dc59376a87" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_d3db623c-38ec-4f79-979f-39dc59376a87_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_acbc247f-cc25-4b4b-b5bf-17c7f4687a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_d3db623c-38ec-4f79-979f-39dc59376a87" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_acbc247f-cc25-4b4b-b5bf-17c7f4687a1f" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_74274a59-8094-4808-bc7a-74c879cab6ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_acbc247f-cc25-4b4b-b5bf-17c7f4687a1f" xlink:to="loc_us-gaap_DomesticPlanMember_74274a59-8094-4808-bc7a-74c879cab6ae" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_61f04d50-b8df-4bec-90a7-21410b7576cc" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_74274a59-8094-4808-bc7a-74c879cab6ae" xlink:to="loc_country_US_61f04d50-b8df-4bec-90a7-21410b7576cc" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_07e48fb8-9ce3-4a79-99a9-430b130dd30b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_acbc247f-cc25-4b4b-b5bf-17c7f4687a1f" xlink:to="loc_us-gaap_ForeignPlanMember_07e48fb8-9ce3-4a79-99a9-430b130dd30b" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsProjectedFuturePostretirementCashFlowByYearDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#RetirementPlansAndPostretirementBenefitsProjectedFuturePostretirementCashFlowByYearDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/RetirementPlansAndPostretirementBenefitsProjectedFuturePostretirementCashFlowByYearDetails" xlink:type="extended" id="iee3667cd6b1447ab8118ce949f527bca_RetirementPlansAndPostretirementBenefitsProjectedFuturePostretirementCashFlowByYearDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear_19573544-208a-4141-8792-8d65a19f9b34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear_19573544-208a-4141-8792-8d65a19f9b34" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear_5357bc69-ddb0-44aa-b603-abb60a767e91" xlink:href="gti-20221231.xsd#gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear_5357bc69-ddb0-44aa-b603-abb60a767e91" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2cba7b7c-fdee-47d7-a682-fb8aab43e8b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2cba7b7c-fdee-47d7-a682-fb8aab43e8b4" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_38ffbaf9-d445-4737-b087-0729293338be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_38ffbaf9-d445-4737-b087-0729293338be" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_6a8b35d5-cce0-427f-a0de-2c4511390e7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_6a8b35d5-cce0-427f-a0de-2c4511390e7d" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_1927b829-a15c-4c29-ac5c-6e8a900af789" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_1927b829-a15c-4c29-ac5c-6e8a900af789" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_9edf3844-100e-433b-9ae0-24ddec304230" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_9edf3844-100e-433b-9ae0-24ddec304230" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_d8f7e934-4f64-40b5-8706-b19bbf149ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_d8f7e934-4f64-40b5-8706-b19bbf149ec1" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_819d30d7-17e3-4255-9222-5c310266cd12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9ecf4d56-4fa5-4110-b9df-0124ca713278" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_819d30d7-17e3-4255-9222-5c310266cd12" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_a3af5e1f-cf45-430f-bd73-9f812d7bb8b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_819d30d7-17e3-4255-9222-5c310266cd12" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_a3af5e1f-cf45-430f-bd73-9f812d7bb8b1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_a3af5e1f-cf45-430f-bd73-9f812d7bb8b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_a3af5e1f-cf45-430f-bd73-9f812d7bb8b1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_a3af5e1f-cf45-430f-bd73-9f812d7bb8b1_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_9220f0f9-1b00-434d-9dd4-6065c0175f59" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_a3af5e1f-cf45-430f-bd73-9f812d7bb8b1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_9220f0f9-1b00-434d-9dd4-6065c0175f59" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostemploymentRetirementBenefitsMember_a1d53e86-7328-4c42-89f4-9ca67e8a7bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PostemploymentRetirementBenefitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_9220f0f9-1b00-434d-9dd4-6065c0175f59" xlink:to="loc_us-gaap_PostemploymentRetirementBenefitsMember_a1d53e86-7328-4c42-89f4-9ca67e8a7bb0" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_ce4ec104-e4ec-4e0c-bec1-2db9a47fc5e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_819d30d7-17e3-4255-9222-5c310266cd12" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_ce4ec104-e4ec-4e0c-bec1-2db9a47fc5e4" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_ce4ec104-e4ec-4e0c-bec1-2db9a47fc5e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_ce4ec104-e4ec-4e0c-bec1-2db9a47fc5e4" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_ce4ec104-e4ec-4e0c-bec1-2db9a47fc5e4_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_c61bf894-236a-4723-ad5d-c1ea5af325fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_ce4ec104-e4ec-4e0c-bec1-2db9a47fc5e4" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_c61bf894-236a-4723-ad5d-c1ea5af325fb" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_66dcb9ed-59e1-4cc3-be3e-d486b8ecdaf7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_c61bf894-236a-4723-ad5d-c1ea5af325fb" xlink:to="loc_us-gaap_DomesticPlanMember_66dcb9ed-59e1-4cc3-be3e-d486b8ecdaf7" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_country_US_056e8aa0-9fd8-4363-8ffb-cde38625d0e1" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_66dcb9ed-59e1-4cc3-be3e-d486b8ecdaf7" xlink:to="loc_country_US_056e8aa0-9fd8-4363-8ffb-cde38625d0e1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_321a545b-f1d7-49eb-a221-150ab5b632ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_c61bf894-236a-4723-ad5d-c1ea5af325fb" xlink:to="loc_us-gaap_ForeignPlanMember_321a545b-f1d7-49eb-a221-150ab5b632ae" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/CommitmentsandContingenciesNarrativesDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#CommitmentsandContingenciesNarrativesDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/CommitmentsandContingenciesNarrativesDetails" xlink:type="extended" id="ia80d1109d3014bd8814cf6a5232b5112_CommitmentsandContingenciesNarrativesDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_4e7d8c64-9265-4ee0-bbc5-80dbe1117b02" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_fa2c62d7-2ac2-4bc3-9f7a-5002681dc415" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_4e7d8c64-9265-4ee0-bbc5-80dbe1117b02" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_fa2c62d7-2ac2-4bc3-9f7a-5002681dc415" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyLossInPeriod_16931fe4-fd61-4033-ad7b-3e70741b79e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyLossInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_4e7d8c64-9265-4ee0-bbc5-80dbe1117b02" xlink:to="loc_us-gaap_LossContingencyLossInPeriod_16931fe4-fd61-4033-ad7b-3e70741b79e1" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualPayments_0ef0c9fa-f7c7-4b9c-a0da-dcfe36a1a66d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyAccrualPayments"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_4e7d8c64-9265-4ee0-bbc5-80dbe1117b02" xlink:to="loc_us-gaap_LossContingencyAccrualPayments_0ef0c9fa-f7c7-4b9c-a0da-dcfe36a1a66d" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ValueAddedTaxAssessmentAmount_330b95a4-55bb-4a1a-9c7c-5d89ab42e374" xlink:href="gti-20221231.xsd#gti_ValueAddedTaxAssessmentAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_4e7d8c64-9265-4ee0-bbc5-80dbe1117b02" xlink:to="loc_gti_ValueAddedTaxAssessmentAmount_330b95a4-55bb-4a1a-9c7c-5d89ab42e374" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_4e7d8c64-9265-4ee0-bbc5-80dbe1117b02" xlink:to="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b41cbff6-d0c0-4d09-96f7-4cbad5e60d60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_us-gaap_AwardTypeAxis_b41cbff6-d0c0-4d09-96f7-4cbad5e60d60" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b41cbff6-d0c0-4d09-96f7-4cbad5e60d60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b41cbff6-d0c0-4d09-96f7-4cbad5e60d60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b41cbff6-d0c0-4d09-96f7-4cbad5e60d60_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_024757d5-b22b-4d0e-aa04-0c0623acbf12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b41cbff6-d0c0-4d09-96f7-4cbad5e60d60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_024757d5-b22b-4d0e-aa04-0c0623acbf12" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ProfitUnitsMember_59ffc00b-0376-4fdf-aed7-5d140c8586cc" xlink:href="gti-20221231.xsd#gti_ProfitUnitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_024757d5-b22b-4d0e-aa04-0c0623acbf12" xlink:to="loc_gti_ProfitUnitsMember_59ffc00b-0376-4fdf-aed7-5d140c8586cc" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_a491152c-f74d-4591-a121-572ec73b4c48" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_us-gaap_PlanNameAxis_a491152c-f74d-4591-a121-572ec73b4c48" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a491152c-f74d-4591-a121-572ec73b4c48_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_a491152c-f74d-4591-a121-572ec73b4c48" xlink:to="loc_us-gaap_PlanNameDomain_a491152c-f74d-4591-a121-572ec73b4c48_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_4c265b54-3326-463d-94f7-3993f92f3b76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_a491152c-f74d-4591-a121-572ec73b4c48" xlink:to="loc_us-gaap_PlanNameDomain_4c265b54-3326-463d-94f7-3993f92f3b76" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_LongtermIncentivePlanMember_1dcd4939-d3ab-4079-97a7-e0d103142f8b" xlink:href="gti-20221231.xsd#gti_LongtermIncentivePlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_4c265b54-3326-463d-94f7-3993f92f3b76" xlink:to="loc_gti_LongtermIncentivePlanMember_1dcd4939-d3ab-4079-97a7-e0d103142f8b" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_446118d1-77aa-4211-a8e5-b586cf0ce228" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_us-gaap_VariableRateAxis_446118d1-77aa-4211-a8e5-b586cf0ce228" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_446118d1-77aa-4211-a8e5-b586cf0ce228_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_446118d1-77aa-4211-a8e5-b586cf0ce228" xlink:to="loc_us-gaap_VariableRateDomain_446118d1-77aa-4211-a8e5-b586cf0ce228_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_889ee50e-9730-44a6-9dd2-04765b4acd4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_446118d1-77aa-4211-a8e5-b586cf0ce228" xlink:to="loc_us-gaap_VariableRateDomain_889ee50e-9730-44a6-9dd2-04765b4acd4e" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_2010a439-a04e-4acb-b949-2074351f76eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_889ee50e-9730-44a6-9dd2-04765b4acd4e" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_2010a439-a04e-4acb-b949-2074351f76eb" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_dcda55ee-87c8-41ae-8185-8e023f3022e5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_srt_LitigationCaseAxis_dcda55ee-87c8-41ae-8185-8e023f3022e5" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_dcda55ee-87c8-41ae-8185-8e023f3022e5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_dcda55ee-87c8-41ae-8185-8e023f3022e5" xlink:to="loc_srt_LitigationCaseTypeDomain_dcda55ee-87c8-41ae-8185-8e023f3022e5_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_c0cfa37d-1e16-461d-bef3-a1b42688cf14" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_dcda55ee-87c8-41ae-8185-8e023f3022e5" xlink:to="loc_srt_LitigationCaseTypeDomain_c0cfa37d-1e16-461d-bef3-a1b42688cf14" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_FixedPriceLTAsMember_04a55dd9-60a3-425d-9943-28b9d81e6df3" xlink:href="gti-20221231.xsd#gti_FixedPriceLTAsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_c0cfa37d-1e16-461d-bef3-a1b42688cf14" xlink:to="loc_gti_FixedPriceLTAsMember_04a55dd9-60a3-425d-9943-28b9d81e6df3" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_93ba1fa1-5b6e-4d88-a28b-a685f757cf68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_93ba1fa1-5b6e-4d88-a28b-a685f757cf68" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_93ba1fa1-5b6e-4d88-a28b-a685f757cf68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_93ba1fa1-5b6e-4d88-a28b-a685f757cf68" xlink:to="loc_us-gaap_LossContingencyNatureDomain_93ba1fa1-5b6e-4d88-a28b-a685f757cf68_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_c754c710-0165-4969-be8d-e0649c913e45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_93ba1fa1-5b6e-4d88-a28b-a685f757cf68" xlink:to="loc_us-gaap_LossContingencyNatureDomain_c754c710-0165-4969-be8d-e0649c913e45" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_LongtermIncentivePlanMember_3729ae56-a5b7-478f-aaa0-1d8148caf9e3" xlink:href="gti-20221231.xsd#gti_LongtermIncentivePlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_c754c710-0165-4969-be8d-e0649c913e45" xlink:to="loc_gti_LongtermIncentivePlanMember_3729ae56-a5b7-478f-aaa0-1d8148caf9e3" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_c38dfc1e-9772-49ff-b9be-18583a015132" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_c38dfc1e-9772-49ff-b9be-18583a015132" xlink:type="arc" order="6"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c38dfc1e-9772-49ff-b9be-18583a015132_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c38dfc1e-9772-49ff-b9be-18583a015132" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c38dfc1e-9772-49ff-b9be-18583a015132_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_34243826-7267-45e7-b0ba-960a1ca649df" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c38dfc1e-9772-49ff-b9be-18583a015132" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_34243826-7267-45e7-b0ba-960a1ca649df" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_d92bc569-966f-4fd1-80d0-f103005b63e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfSalesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_34243826-7267-45e7-b0ba-960a1ca649df" xlink:to="loc_us-gaap_CostOfSalesMember_d92bc569-966f-4fd1-80d0-f103005b63e0" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_ea02cd48-e336-4b62-8c1f-2c70e9ef18d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_34243826-7267-45e7-b0ba-960a1ca649df" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_ea02cd48-e336-4b62-8c1f-2c70e9ef18d3" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_98d6fec9-ecbc-4578-bdf7-460131a16f19" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_srt_ConsolidatedEntitiesAxis_98d6fec9-ecbc-4578-bdf7-460131a16f19" xlink:type="arc" order="7"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_98d6fec9-ecbc-4578-bdf7-460131a16f19_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_98d6fec9-ecbc-4578-bdf7-460131a16f19" xlink:to="loc_srt_ConsolidatedEntitiesDomain_98d6fec9-ecbc-4578-bdf7-460131a16f19_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_3ae9c4ff-f93b-4196-8319-622117b366ac" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_98d6fec9-ecbc-4578-bdf7-460131a16f19" xlink:to="loc_srt_ConsolidatedEntitiesDomain_3ae9c4ff-f93b-4196-8319-622117b366ac" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GrafTechInternationalLtdMember_e216db6e-8d95-45b6-b121-69597bdb002b" xlink:href="gti-20221231.xsd#gti_GrafTechInternationalLtdMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_3ae9c4ff-f93b-4196-8319-622117b366ac" xlink:to="loc_gti_GrafTechInternationalLtdMember_e216db6e-8d95-45b6-b121-69597bdb002b" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_cfac0bce-8c03-44f3-ab93-9f1843c720b5" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_dei_LegalEntityAxis_cfac0bce-8c03-44f3-ab93-9f1843c720b5" xlink:type="arc" order="8"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cfac0bce-8c03-44f3-ab93-9f1843c720b5_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_cfac0bce-8c03-44f3-ab93-9f1843c720b5" xlink:to="loc_dei_EntityDomain_cfac0bce-8c03-44f3-ab93-9f1843c720b5_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_07bb53de-230f-496f-9f62-43718c9b00c4" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_cfac0bce-8c03-44f3-ab93-9f1843c720b5" xlink:to="loc_dei_EntityDomain_07bb53de-230f-496f-9f62-43718c9b00c4" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_BrookfieldMember_fe55b07a-00b9-43e1-ba03-3f272af677ba" xlink:href="gti-20221231.xsd#gti_BrookfieldMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_07bb53de-230f-496f-9f62-43718c9b00c4" xlink:to="loc_gti_BrookfieldMember_fe55b07a-00b9-43e1-ba03-3f272af677ba" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_a18949ea-e286-4c52-aa50-56b34c23f845" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c8e8c451-8196-46f4-bebb-fa03f585a3ce" xlink:to="loc_srt_StatementScenarioAxis_a18949ea-e286-4c52-aa50-56b34c23f845" xlink:type="arc" order="9"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_a18949ea-e286-4c52-aa50-56b34c23f845_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_a18949ea-e286-4c52-aa50-56b34c23f845" xlink:to="loc_srt_ScenarioUnspecifiedDomain_a18949ea-e286-4c52-aa50-56b34c23f845_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_1534a40b-b3d0-4338-987d-f07bfa2c927b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_a18949ea-e286-4c52-aa50-56b34c23f845" xlink:to="loc_srt_ScenarioUnspecifiedDomain_1534a40b-b3d0-4338-987d-f07bfa2c927b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioPlanMember_f15908e2-d131-4ead-a055-26d0ac38b42e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_1534a40b-b3d0-4338-987d-f07bfa2c927b" xlink:to="loc_us-gaap_ScenarioPlanMember_f15908e2-d131-4ead-a055-26d0ac38b42e" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/CommitmentsandContingenciesTaxReceivableAgreementDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#CommitmentsandContingenciesTaxReceivableAgreementDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/CommitmentsandContingenciesTaxReceivableAgreementDetails" xlink:type="extended" id="ib41591e7fcb44fd691298d81033aceab_CommitmentsandContingenciesTaxReceivableAgreementDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_RelatedPartyTaxAgreementPercentOfSavings_0339b253-2aec-49b4-aec6-a4662a34a20e" xlink:href="gti-20221231.xsd#gti_RelatedPartyTaxAgreementPercentOfSavings"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:to="loc_gti_RelatedPartyTaxAgreementPercentOfSavings_0339b253-2aec-49b4-aec6-a4662a34a20e" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_DueToRelatedPartyBasisSpreadOnVariableRate_44fbc8e0-53fe-4fff-9254-7f684af9f14a" xlink:href="gti-20221231.xsd#gti_DueToRelatedPartyBasisSpreadOnVariableRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:to="loc_gti_DueToRelatedPartyBasisSpreadOnVariableRate_44fbc8e0-53fe-4fff-9254-7f684af9f14a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_3e928b5d-5a5e-47d9-a6dd-4887aaac7313" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesCurrentAndNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_3e928b5d-5a5e-47d9-a6dd-4887aaac7313" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_4191c63e-fecd-48f1-ac7e-bfbce75d7624" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrent_4191c63e-fecd-48f1-ac7e-bfbce75d7624" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToRelatedPartiesNoncurrent_6aabe6e3-1487-4374-b48f-d3a0a5c55ce7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:to="loc_us-gaap_DueToRelatedPartiesNoncurrent_6aabe6e3-1487-4374-b48f-d3a0a5c55ce7" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_d0587789-bc8f-420b-aea7-9d1ff6229303" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_4d199545-4e51-441b-b182-2b95625f1103" xlink:to="loc_us-gaap_OtherCommitmentsTable_d0587789-bc8f-420b-aea7-9d1ff6229303" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_2854a384-bdd1-4c38-a5d5-f4d15e9cb882" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d0587789-bc8f-420b-aea7-9d1ff6229303" xlink:to="loc_us-gaap_OtherCommitmentsAxis_2854a384-bdd1-4c38-a5d5-f4d15e9cb882" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_2854a384-bdd1-4c38-a5d5-f4d15e9cb882_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_2854a384-bdd1-4c38-a5d5-f4d15e9cb882" xlink:to="loc_us-gaap_OtherCommitmentsDomain_2854a384-bdd1-4c38-a5d5-f4d15e9cb882_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_5f9ea14b-b673-458a-8681-4cfb99e01daa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_2854a384-bdd1-4c38-a5d5-f4d15e9cb882" xlink:to="loc_us-gaap_OtherCommitmentsDomain_5f9ea14b-b673-458a-8681-4cfb99e01daa" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/CommitmentsandContingenciesLongtermIncentivePlanDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#CommitmentsandContingenciesLongtermIncentivePlanDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/CommitmentsandContingenciesLongtermIncentivePlanDetails" xlink:type="extended" id="icb9dc2eaeb39440d8add39761c157813_CommitmentsandContingenciesLongtermIncentivePlanDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_335f1a15-6fb1-405f-a08f-91e3a577754b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_291af69e-3c97-4134-9985-554e0c39bbd4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_335f1a15-6fb1-405f-a08f-91e3a577754b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_291af69e-3c97-4134-9985-554e0c39bbd4" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_a7ce787c-06cb-449d-9d9a-4d3417e061ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_335f1a15-6fb1-405f-a08f-91e3a577754b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_a7ce787c-06cb-449d-9d9a-4d3417e061ec" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ChangeInControlOwnershipPercentageDisposalThresholdForPaymentCalculation_74dca291-eea7-4bcd-bb6f-7b2a2a8a3ad0" xlink:href="gti-20221231.xsd#gti_ChangeInControlOwnershipPercentageDisposalThresholdForPaymentCalculation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_335f1a15-6fb1-405f-a08f-91e3a577754b" xlink:to="loc_gti_ChangeInControlOwnershipPercentageDisposalThresholdForPaymentCalculation_74dca291-eea7-4bcd-bb6f-7b2a2a8a3ad0" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_d66fe3d2-e289-4556-9165-f63fd79896d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_335f1a15-6fb1-405f-a08f-91e3a577754b" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_d66fe3d2-e289-4556-9165-f63fd79896d3" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_335f1a15-6fb1-405f-a08f-91e3a577754b" xlink:to="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_d5216f63-85c0-4231-92f2-afbefe4f529b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:to="loc_us-gaap_AwardTypeAxis_d5216f63-85c0-4231-92f2-afbefe4f529b" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d5216f63-85c0-4231-92f2-afbefe4f529b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_d5216f63-85c0-4231-92f2-afbefe4f529b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d5216f63-85c0-4231-92f2-afbefe4f529b_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cb33e00a-17ee-43e9-b525-98976019bbd0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_d5216f63-85c0-4231-92f2-afbefe4f529b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cb33e00a-17ee-43e9-b525-98976019bbd0" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_ProfitUnitsMember_70c16a0d-7c90-41e0-9967-522f1027715b" xlink:href="gti-20221231.xsd#gti_ProfitUnitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cb33e00a-17ee-43e9-b525-98976019bbd0" xlink:to="loc_gti_ProfitUnitsMember_70c16a0d-7c90-41e0-9967-522f1027715b" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e087e2be-b4a1-437c-bf95-b91c4fdc3e28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:to="loc_us-gaap_PlanNameAxis_e087e2be-b4a1-437c-bf95-b91c4fdc3e28" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e087e2be-b4a1-437c-bf95-b91c4fdc3e28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_e087e2be-b4a1-437c-bf95-b91c4fdc3e28" xlink:to="loc_us-gaap_PlanNameDomain_e087e2be-b4a1-437c-bf95-b91c4fdc3e28_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_4cd47344-b7b3-4086-a644-e96d6a756970" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_e087e2be-b4a1-437c-bf95-b91c4fdc3e28" xlink:to="loc_us-gaap_PlanNameDomain_4cd47344-b7b3-4086-a644-e96d6a756970" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_LongtermIncentivePlanMember_7eb8cdb5-d3a6-4ca9-a0dc-c164098c7c0c" xlink:href="gti-20221231.xsd#gti_LongtermIncentivePlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_4cd47344-b7b3-4086-a644-e96d6a756970" xlink:to="loc_gti_LongtermIncentivePlanMember_7eb8cdb5-d3a6-4ca9-a0dc-c164098c7c0c" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_4266ae3a-6789-4a7d-8d51-2ce4e537eea3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:to="loc_us-gaap_OtherCommitmentsAxis_4266ae3a-6789-4a7d-8d51-2ce4e537eea3" xlink:type="arc" order="3"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_4266ae3a-6789-4a7d-8d51-2ce4e537eea3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_4266ae3a-6789-4a7d-8d51-2ce4e537eea3" xlink:to="loc_us-gaap_OtherCommitmentsDomain_4266ae3a-6789-4a7d-8d51-2ce4e537eea3_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_983f4443-ff31-4a78-a060-f93aa11eef03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_4266ae3a-6789-4a7d-8d51-2ce4e537eea3" xlink:to="loc_us-gaap_OtherCommitmentsDomain_983f4443-ff31-4a78-a060-f93aa11eef03" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_bcca436a-8a2e-473f-b0d5-c880d865aef2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_bcca436a-8a2e-473f-b0d5-c880d865aef2" xlink:type="arc" order="4"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_bcca436a-8a2e-473f-b0d5-c880d865aef2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_bcca436a-8a2e-473f-b0d5-c880d865aef2" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_bcca436a-8a2e-473f-b0d5-c880d865aef2_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_0d0960b6-8b33-486d-8198-fc9a04e68500" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_bcca436a-8a2e-473f-b0d5-c880d865aef2" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_0d0960b6-8b33-486d-8198-fc9a04e68500" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_GrafTechInternationalLtdMember_401db871-5b2e-4b90-bbbe-c1ebaaeefe01" xlink:href="gti-20221231.xsd#gti_GrafTechInternationalLtdMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_0d0960b6-8b33-486d-8198-fc9a04e68500" xlink:to="loc_gti_GrafTechInternationalLtdMember_401db871-5b2e-4b90-bbbe-c1ebaaeefe01" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_6c15d316-9cff-4ea8-9923-94acf257a557" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_2262688e-1374-4c34-a5eb-9367e2da41eb" xlink:to="loc_dei_LegalEntityAxis_6c15d316-9cff-4ea8-9923-94acf257a557" xlink:type="arc" order="5"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6c15d316-9cff-4ea8-9923-94acf257a557_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_6c15d316-9cff-4ea8-9923-94acf257a557" xlink:to="loc_dei_EntityDomain_6c15d316-9cff-4ea8-9923-94acf257a557_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_39baed2e-ecf4-4f93-8598-a635e94a5826" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_6c15d316-9cff-4ea8-9923-94acf257a557" xlink:to="loc_dei_EntityDomain_39baed2e-ecf4-4f93-8598-a635e94a5826" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_gti_BrookfieldMember_2c2aa48d-2ee9-4f9d-a7dc-4533f739abf2" xlink:href="gti-20221231.xsd#gti_BrookfieldMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_39baed2e-ecf4-4f93-8598-a635e94a5826" xlink:to="loc_gti_BrookfieldMember_2c2aa48d-2ee9-4f9d-a7dc-4533f739abf2" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/IncomeTaxesNarrativeDetails2" xlink:type="simple" xlink:href="gti-20221231.xsd#IncomeTaxesNarrativeDetails2"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/IncomeTaxesNarrativeDetails2" xlink:type="extended" id="iab9396464c9f40e89aced767e753d333_IncomeTaxesNarrativeDetails2">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_725e417c-a62a-4a8b-8d70-16fb1fa7bcf6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExaminationLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_f7971399-f323-471c-8f39-23aa80a95552" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwards"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_725e417c-a62a-4a8b-8d70-16fb1fa7bcf6" xlink:to="loc_us-gaap_OperatingLossCarryforwards_f7971399-f323-471c-8f39-23aa80a95552" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal_f9f084bb-6c69-4e16-b91c-5ea243ea275f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_725e417c-a62a-4a8b-8d70-16fb1fa7bcf6" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal_f9f084bb-6c69-4e16-b91c-5ea243ea275f" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_434c34b0-3e98-452c-8fbb-7d68bf7d919b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TaxCreditCarryforwardAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_725e417c-a62a-4a8b-8d70-16fb1fa7bcf6" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_434c34b0-3e98-452c-8fbb-7d68bf7d919b" xlink:type="arc" order="2"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_29f0410c-c40a-4c8f-b1c0-7adc8e7e9b91" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxContingencyTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_725e417c-a62a-4a8b-8d70-16fb1fa7bcf6" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_29f0410c-c40a-4c8f-b1c0-7adc8e7e9b91" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_6231cff6-5705-4228-9a72-ab1febbf4762" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_29f0410c-c40a-4c8f-b1c0-7adc8e7e9b91" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_6231cff6-5705-4228-9a72-ab1febbf4762" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_6231cff6-5705-4228-9a72-ab1febbf4762_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_6231cff6-5705-4228-9a72-ab1febbf4762" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_6231cff6-5705-4228-9a72-ab1febbf4762_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_f932abfb-cd46-45b1-bc9d-2981232aad92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_6231cff6-5705-4228-9a72-ab1febbf4762" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_f932abfb-cd46-45b1-bc9d-2981232aad92" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_0f9d9baf-7726-4749-9164-8ab2e7241b84" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCountryMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_f932abfb-cd46-45b1-bc9d-2981232aad92" xlink:to="loc_us-gaap_ForeignCountryMember_0f9d9baf-7726-4749-9164-8ab2e7241b84" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_d9d9d9df-caed-4ff6-8065-7e8d3e04096a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StateAndLocalJurisdictionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_f932abfb-cd46-45b1-bc9d-2981232aad92" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_d9d9d9df-caed-4ff6-8065-7e8d3e04096a" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/StockholdersEquityScheduleOfAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#StockholdersEquityScheduleOfAccumulatedOtherComprehensiveLossDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/StockholdersEquityScheduleOfAccumulatedOtherComprehensiveLossDetails" xlink:type="extended" id="if9665ec943ab483988527356b4361082_StockholdersEquityScheduleOfAccumulatedOtherComprehensiveLossDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7bd7fd2f-ce73-49a8-84fa-81b9bb62adf9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_8f5b3ce0-60fa-457e-a020-c653d524a868" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7bd7fd2f-ce73-49a8-84fa-81b9bb62adf9" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_8f5b3ce0-60fa-457e-a020-c653d524a868" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_0bc8e3f1-6b4b-42be-8e9f-cc59141b0703" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7bd7fd2f-ce73-49a8-84fa-81b9bb62adf9" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_0bc8e3f1-6b4b-42be-8e9f-cc59141b0703" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_fbe8fac8-09e8-4782-8431-e0901134669a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_0bc8e3f1-6b4b-42be-8e9f-cc59141b0703" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_fbe8fac8-09e8-4782-8431-e0901134669a" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fbe8fac8-09e8-4782-8431-e0901134669a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_fbe8fac8-09e8-4782-8431-e0901134669a" xlink:to="loc_us-gaap_EquityComponentDomain_fbe8fac8-09e8-4782-8431-e0901134669a_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3b6ffe85-105b-4d20-96b0-85f6d30d2e87" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_fbe8fac8-09e8-4782-8431-e0901134669a" xlink:to="loc_us-gaap_EquityComponentDomain_3b6ffe85-105b-4d20-96b0-85f6d30d2e87" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_f8a2cc4d-12df-4040-8320-02155fcda24d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6ffe85-105b-4d20-96b0-85f6d30d2e87" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_f8a2cc4d-12df-4040-8320-02155fcda24d" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_be088d95-1d48-4ac1-9889-fe6824678ee5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6ffe85-105b-4d20-96b0-85f6d30d2e87" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_be088d95-1d48-4ac1-9889-fe6824678ee5" xlink:type="arc" order="1"/>

</link:definitionLink>

<link:roleRef roleURI="http://www.graftech.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="gti-20221231.xsd#SubsequentEventsDetails"/>

<link:definitionLink xlink:role="http://www.graftech.com/role/SubsequentEventsDetails" xlink:type="extended" id="i1821ec21476e4753bb5e4afa56650317_SubsequentEventsDetails">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_f544e66f-c04f-43c4-b817-8c038f623904" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventLineItems"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_5b7c744e-3db8-4668-ac42-df2c605ed845" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_f544e66f-c04f-43c4-b817-8c038f623904" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_5b7c744e-3db8-4668-ac42-df2c605ed845" xlink:type="arc" order="0"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_a3f46bc9-c6c6-433d-80ef-335ce01bbfbd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_f544e66f-c04f-43c4-b817-8c038f623904" xlink:to="loc_us-gaap_SubsequentEventTable_a3f46bc9-c6c6-433d-80ef-335ce01bbfbd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_73c2bd01-fb76-414e-a54c-dc4ad27e40be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_a3f46bc9-c6c6-433d-80ef-335ce01bbfbd" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_73c2bd01-fb76-414e-a54c-dc4ad27e40be" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_73c2bd01-fb76-414e-a54c-dc4ad27e40be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_73c2bd01-fb76-414e-a54c-dc4ad27e40be" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_73c2bd01-fb76-414e-a54c-dc4ad27e40be_default" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_54a6b6d9-a3ab-4893-bdec-51e9328e8997" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_73c2bd01-fb76-414e-a54c-dc4ad27e40be" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_54a6b6d9-a3ab-4893-bdec-51e9328e8997" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_71a9eab6-6047-4477-9a09-09171f2c065d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_54a6b6d9-a3ab-4893-bdec-51e9328e8997" xlink:to="loc_us-gaap_SubsequentEventMember_71a9eab6-6047-4477-9a09-09171f2c065d" xlink:type="arc" order="0"/>

</link:definitionLink>

<link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm"/>

<link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>

</link:definitionLink>

</link:linkbase>

1 Subsequent Filing that References this Filing

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

 2/14/24  GrafTech International Ltd.       10-K       12/31/23  143:27M

15 Previous Filings that this Filing References

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

 8/05/22  GrafTech International Ltd.       10-Q        6/30/22   78:6.6M
 6/28/22  GrafTech International Ltd.       8-K:5,9     6/27/22   13:9.7M
 6/02/22  GrafTech International Ltd.       8-K:1,2,9   5/31/22   11:1.9M                                   Donnelley … Solutions/FA
 2/22/22  GrafTech International Ltd.       10-K       12/31/21  136:14M
 2/19/21  GrafTech International Ltd.       8-K:1,9     2/17/21   11:1.8M                                   Donnelley … Solutions/FA
12/23/20  GrafTech International Ltd.       8-K:1,2,9  12/22/20   12:1.4M                                   Donnelley … Solutions/FA
 2/21/20  GrafTech International Ltd.       10-K       12/31/19  132:15M
 5/01/19  GrafTech International Ltd.       10-Q        3/31/19   84:5.2M
 2/22/19  GrafTech International Ltd.       10-K       12/31/18  129:15M
 8/03/18  GrafTech International Ltd.       10-Q        6/30/18   80:6.8M
 4/13/18  GrafTech International Ltd.       S-1/A                  6:4.9M                                   Toppan Merrill-FA
 4/04/18  GrafTech International Ltd.       S-1/A                  9:4.5M                                   Toppan Merrill-FA
 3/26/18  GrafTech International Ltd.       S-1/A       3/23/18   11:5.1M                                   Toppan Merrill-FA
 3/20/18  GrafTech International Ltd.       S-1                   24:7.8M                                   Toppan Merrill-FA
 5/18/15  GrafTech International Ltd.       SC TO-C                5:804K GrafTech International Ltd.       Donnelley … Solutions/FA

↑Top

Filing Submission 0000931148-23-000035 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

GrafTech International Ltd. – ‘10-K’ for 12/31/22 – ‘EX-101.DEF’

On: Tuesday, 2/14/23, at 4:12pm ET · For: 12/31/22 · Accession #: 931148-23-35 · File #: 1-13888

Annual Report — Form 10-KFiling Table of Contents

‘EX-101.DEF’ — XBRL Definitions — gti-20221231_def

This Exhibit is an XBRL XML File.

1 Subsequent Filing that References this Filing

15 Previous Filings that this Filing References

Annual Report — Form 10-K

Filing Table of Contents