<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:900cc5f2-9e91-4559-ab93-487871ad4046,g:d63b8969-905e-4c5b-bf41-7581b381b9a6-->
<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.amkor.com/role/ConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="simple" xlink:href="amkr-20220930.xsd#ConsolidatedStatementsofStockholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/ConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="extended" id="i3d594d01e676405b81364d71c5726715_ConsolidatedStatementsofStockholdersEquityUnaudited">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_c191bcd3-258a-4896-9743-19fc87e8c08c" 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_72b51943-f682-4088-9e58-76c2cd2a33fc" 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_c191bcd3-258a-4896-9743-19fc87e8c08c" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_a2618028-2a3e-4556-80ca-1fd401481140" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_a2618028-2a3e-4556-80ca-1fd401481140" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_f70f7c7a-8948-4839-b849-232fa0be6df6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_f70f7c7a-8948-4839-b849-232fa0be6df6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_79a8af26-e332-442f-8cf9-23544f100745" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_TreasuryStockCommonShares_79a8af26-e332-442f-8cf9-23544f100745" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_54a05185-f2fb-4896-a4b9-e7ee0170597f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_ProfitLoss_54a05185-f2fb-4896-a4b9-e7ee0170597f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_1534df65-e559-4c99-aefd-08894a75ead0" 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_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_1534df65-e559-4c99-aefd-08894a75ead0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_b9afe654-a441-440a-9e2c-7c0a7bdcb3b0" 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_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_b9afe654-a441-440a-9e2c-7c0a7bdcb3b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_3a81e4f1-73a5-4725-8eca-b4354103278b" 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_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_3a81e4f1-73a5-4725-8eca-b4354103278b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2ed09717-99d6-4fd5-821a-5ec0913bb200" 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_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2ed09717-99d6-4fd5-821a-5ec0913bb200" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_7362e8af-855b-4549-9c00-0cc0dac94b28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_7362e8af-855b-4549-9c00-0cc0dac94b28" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_c6fe7572-8d3e-439f-b1e1-ed175c28440d" 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_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_c6fe7572-8d3e-439f-b1e1-ed175c28440d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_63378f4f-fa99-4937-ac0c-e0d9dafb1d46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_DividendsCash_63378f4f-fa99-4937-ac0c-e0d9dafb1d46" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_8b799061-1c41-420a-834c-8e0ab2e7860f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_72b51943-f682-4088-9e58-76c2cd2a33fc" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_8b799061-1c41-420a-834c-8e0ab2e7860f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_bbd88e84-7674-438d-ab2e-477a3a82848b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_d1312239-ba13-4d32-9f10-5a4fae32b997" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_b7914063-baeb-4790-850e-130513476e33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_3776e28f-64af-4b97-b9a9-06ea384186be" 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_c191bcd3-258a-4896-9743-19fc87e8c08c" xlink:to="loc_us-gaap_StatementTable_3776e28f-64af-4b97-b9a9-06ea384186be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_a9e7a2e7-f7be-4056-a932-88286d47fd41" 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_3776e28f-64af-4b97-b9a9-06ea384186be" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_a9e7a2e7-f7be-4056-a932-88286d47fd41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a9e7a2e7-f7be-4056-a932-88286d47fd41_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_a9e7a2e7-f7be-4056-a932-88286d47fd41" xlink:to="loc_us-gaap_EquityComponentDomain_a9e7a2e7-f7be-4056-a932-88286d47fd41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_06e7612d-eb7f-452a-9fa3-6c527babf570" 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_a9e7a2e7-f7be-4056-a932-88286d47fd41" xlink:to="loc_us-gaap_EquityComponentDomain_06e7612d-eb7f-452a-9fa3-6c527babf570" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_06e7612d-eb7f-452a-9fa3-6c527babf570" xlink:to="loc_us-gaap_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_42dc8c0c-8979-45c4-ae6f-2d61e59ac015" 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_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:to="loc_us-gaap_CommonStockMember_42dc8c0c-8979-45c4-ae6f-2d61e59ac015" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_1e40dbb7-15bd-4732-9deb-c6b090f541a0" 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_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_1e40dbb7-15bd-4732-9deb-c6b090f541a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_f0ee34e4-e5da-4714-a8ef-913ddaca8cc1" 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_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:to="loc_us-gaap_RetainedEarningsMember_f0ee34e4-e5da-4714-a8ef-913ddaca8cc1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1732a56b-c340-4430-8633-14072f2679b3" 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_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1732a56b-c340-4430-8633-14072f2679b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_846da207-d0f2-4864-9b06-3cea8bb3208f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_46367aa9-f97b-4438-8acd-6e1bc409de12" xlink:to="loc_us-gaap_TreasuryStockCommonMember_846da207-d0f2-4864-9b06-3cea8bb3208f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_09e151d7-8e41-4ce9-b9fd-93035aaf23c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_06e7612d-eb7f-452a-9fa3-6c527babf570" xlink:to="loc_us-gaap_NoncontrollingInterestMember_09e151d7-8e41-4ce9-b9fd-93035aaf23c6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/InterimFinancialStatementsDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#InterimFinancialStatementsDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/InterimFinancialStatementsDetails" xlink:type="extended" id="i8421da65531e4fde8f083c504e06e79b_InterimFinancialStatementsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_26b4d2cf-94f5-4196-a298-410483d2a016" 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_UnbilledReceivablesCurrent_d754f9c3-5d23-47e0-a990-3ee665ac0ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnbilledReceivablesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_26b4d2cf-94f5-4196-a298-410483d2a016" xlink:to="loc_us-gaap_UnbilledReceivablesCurrent_d754f9c3-5d23-47e0-a990-3ee665ac0ff0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_795ef549-6a7b-4259-9a1c-5b9eed474a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_26b4d2cf-94f5-4196-a298-410483d2a016" xlink:to="loc_us-gaap_ContractWithCustomerLiability_795ef549-6a7b-4259-9a1c-5b9eed474a2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_c5f1c861-869b-418f-b0dd-a70178592df6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_26b4d2cf-94f5-4196-a298-410483d2a016" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_c5f1c861-869b-418f-b0dd-a70178592df6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a5219dd4-2542-496e-9971-a9ce3146c9a8" 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_26b4d2cf-94f5-4196-a298-410483d2a016" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a5219dd4-2542-496e-9971-a9ce3146c9a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_743a02fc-c35b-4102-b7bb-7d8a81a80416" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_26b4d2cf-94f5-4196-a298-410483d2a016" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_743a02fc-c35b-4102-b7bb-7d8a81a80416" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_baff243e-7356-49c5-9716-f0913b7fbb0f" 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_26b4d2cf-94f5-4196-a298-410483d2a016" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_baff243e-7356-49c5-9716-f0913b7fbb0f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0c0579c7-e108-4551-a719-398696db7c49" 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_baff243e-7356-49c5-9716-f0913b7fbb0f" xlink:to="loc_srt_RangeAxis_0c0579c7-e108-4551-a719-398696db7c49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0c0579c7-e108-4551-a719-398696db7c49_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_0c0579c7-e108-4551-a719-398696db7c49" xlink:to="loc_srt_RangeMember_0c0579c7-e108-4551-a719-398696db7c49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_91d25d2f-783e-451b-9c2e-3823a013d7a2" 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_0c0579c7-e108-4551-a719-398696db7c49" xlink:to="loc_srt_RangeMember_91d25d2f-783e-451b-9c2e-3823a013d7a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_779d08d1-f8e7-4d5d-81a5-2f9bd1d131ae" 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_91d25d2f-783e-451b-9c2e-3823a013d7a2" xlink:to="loc_srt_MinimumMember_779d08d1-f8e7-4d5d-81a5-2f9bd1d131ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a6b77451-9e8d-41e5-96fa-ecb5bb9db9bd" 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_91d25d2f-783e-451b-9c2e-3823a013d7a2" xlink:to="loc_srt_MaximumMember_a6b77451-9e8d-41e5-96fa-ecb5bb9db9bd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/NetSalesbyProductGroupandEndMarketProductGroupDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#NetSalesbyProductGroupandEndMarketProductGroupDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/NetSalesbyProductGroupandEndMarketProductGroupDetails" xlink:type="extended" id="i78a68db3035c450dbfe865eac7081c09_NetSalesbyProductGroupandEndMarketProductGroupDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_d6031183-5e1a-4f9b-9136-80f74ea4adaa" 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_a17974fd-af76-4dbb-9d68-40455093156f" 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_d6031183-5e1a-4f9b-9136-80f74ea4adaa" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a17974fd-af76-4dbb-9d68-40455093156f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_4c07edb8-b6e5-4ff0-ba4a-3bf22a7052fe" 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_d6031183-5e1a-4f9b-9136-80f74ea4adaa" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_4c07edb8-b6e5-4ff0-ba4a-3bf22a7052fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_975d0cb9-64f8-4e1b-b3f2-69fdf59c8a61" 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_DisaggregationOfRevenueTable_4c07edb8-b6e5-4ff0-ba4a-3bf22a7052fe" xlink:to="loc_srt_ProductOrServiceAxis_975d0cb9-64f8-4e1b-b3f2-69fdf59c8a61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_975d0cb9-64f8-4e1b-b3f2-69fdf59c8a61_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_975d0cb9-64f8-4e1b-b3f2-69fdf59c8a61" xlink:to="loc_srt_ProductsAndServicesDomain_975d0cb9-64f8-4e1b-b3f2-69fdf59c8a61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_72e3981e-9b6a-4bbc-8c07-bd3466d26767" 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_975d0cb9-64f8-4e1b-b3f2-69fdf59c8a61" xlink:to="loc_srt_ProductsAndServicesDomain_72e3981e-9b6a-4bbc-8c07-bd3466d26767" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_AdvancedProductsMember_d958d60c-2aae-40ad-93b4-a45a38fd6fe3" xlink:href="amkr-20220930.xsd#amkr_AdvancedProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_72e3981e-9b6a-4bbc-8c07-bd3466d26767" xlink:to="loc_amkr_AdvancedProductsMember_d958d60c-2aae-40ad-93b4-a45a38fd6fe3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_MainstreamProductsMember_041774f8-5402-43b5-914c-75cf1080ab59" xlink:href="amkr-20220930.xsd#amkr_MainstreamProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_72e3981e-9b6a-4bbc-8c07-bd3466d26767" xlink:to="loc_amkr_MainstreamProductsMember_041774f8-5402-43b5-914c-75cf1080ab59" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/NetSalesbyProductGroupandEndMarketEndMarketDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#NetSalesbyProductGroupandEndMarketEndMarketDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/NetSalesbyProductGroupandEndMarketEndMarketDetails" xlink:type="extended" id="i9ed70e7248df47b392c27729da373408_NetSalesbyProductGroupandEndMarketEndMarketDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_ef118cdd-0b9e-433a-bb6f-9576d8cd45ec" 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_ConcentrationRiskPercentage1_e156a039-340d-4675-bb62-88ed5d15c009" 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_DisaggregationOfRevenueLineItems_ef118cdd-0b9e-433a-bb6f-9576d8cd45ec" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_e156a039-340d-4675-bb62-88ed5d15c009" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_53e57b30-c50d-4441-94b7-90974276cb6c" 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_ef118cdd-0b9e-433a-bb6f-9576d8cd45ec" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_53e57b30-c50d-4441-94b7-90974276cb6c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9b3139a2-d792-449f-a32d-c82265b0d032" 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_DisaggregationOfRevenueTable_53e57b30-c50d-4441-94b7-90974276cb6c" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9b3139a2-d792-449f-a32d-c82265b0d032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9b3139a2-d792-449f-a32d-c82265b0d032_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_9b3139a2-d792-449f-a32d-c82265b0d032" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9b3139a2-d792-449f-a32d-c82265b0d032_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b58d034e-26c4-47b5-b091-c84156d7d6f4" 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_9b3139a2-d792-449f-a32d-c82265b0d032" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b58d034e-26c4-47b5-b091-c84156d7d6f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_5a791b0d-4b9a-4e78-8256-aad217a029e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b58d034e-26c4-47b5-b091-c84156d7d6f4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_5a791b0d-4b9a-4e78-8256-aad217a029e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_411baeda-5455-4ef8-b80f-66a7d8f3f448" 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_DisaggregationOfRevenueTable_53e57b30-c50d-4441-94b7-90974276cb6c" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_411baeda-5455-4ef8-b80f-66a7d8f3f448" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_411baeda-5455-4ef8-b80f-66a7d8f3f448_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_411baeda-5455-4ef8-b80f-66a7d8f3f448" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_411baeda-5455-4ef8-b80f-66a7d8f3f448_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_9ff29c46-a068-429a-b1f4-8a0d474d8e8c" 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_411baeda-5455-4ef8-b80f-66a7d8f3f448" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_9ff29c46-a068-429a-b1f4-8a0d474d8e8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DistributionChannelConcentrationRiskMember_d3c36275-4223-4599-b165-d20170a0b4fd" xlink:href="amkr-20220930.xsd#amkr_DistributionChannelConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_9ff29c46-a068-429a-b1f4-8a0d474d8e8c" xlink:to="loc_amkr_DistributionChannelConcentrationRiskMember_d3c36275-4223-4599-b165-d20170a0b4fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_b95192d3-470a-496d-a926-7c7e64fb9e73" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_53e57b30-c50d-4441-94b7-90974276cb6c" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_b95192d3-470a-496d-a926-7c7e64fb9e73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_b95192d3-470a-496d-a926-7c7e64fb9e73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_b95192d3-470a-496d-a926-7c7e64fb9e73" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_b95192d3-470a-496d-a926-7c7e64fb9e73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_54a1b811-3fa5-49cf-a443-2a244a368940" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_b95192d3-470a-496d-a926-7c7e64fb9e73" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_54a1b811-3fa5-49cf-a443-2a244a368940" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SalesChannelCommunicationsMember_68637f05-c81c-45c8-8161-f2b701ac60c4" xlink:href="amkr-20220930.xsd#amkr_SalesChannelCommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_54a1b811-3fa5-49cf-a443-2a244a368940" xlink:to="loc_amkr_SalesChannelCommunicationsMember_68637f05-c81c-45c8-8161-f2b701ac60c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SalesChannelConsumerGoodsMember_8d36f581-1026-4025-a1b4-b84ca8bc2c30" xlink:href="amkr-20220930.xsd#amkr_SalesChannelConsumerGoodsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_54a1b811-3fa5-49cf-a443-2a244a368940" xlink:to="loc_amkr_SalesChannelConsumerGoodsMember_8d36f581-1026-4025-a1b4-b84ca8bc2c30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SalesChannelAutomotiveIndustrialAndOtherMember_0431631c-35a2-47c9-82fc-f590bfa49799" xlink:href="amkr-20220930.xsd#amkr_SalesChannelAutomotiveIndustrialAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_54a1b811-3fa5-49cf-a443-2a244a368940" xlink:to="loc_amkr_SalesChannelAutomotiveIndustrialAndOtherMember_0431631c-35a2-47c9-82fc-f590bfa49799" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SalesChannelComputingMember_31c981c0-1e87-4dfd-80c1-e01c4c363b6b" xlink:href="amkr-20220930.xsd#amkr_SalesChannelComputingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_54a1b811-3fa5-49cf-a443-2a244a368940" xlink:to="loc_amkr_SalesChannelComputingMember_31c981c0-1e87-4dfd-80c1-e01c4c363b6b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#AccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended" id="i8c953dc647aa48578a7cc6f0bae6737a_AccumulatedOtherComprehensiveIncomeLossDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7c59d2c4-c01b-44dc-990c-9cb5ab6235f0" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_699e4fb3-df1c-40c1-89fd-24efe1d32ef2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7c59d2c4-c01b-44dc-990c-9cb5ab6235f0" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_699e4fb3-df1c-40c1-89fd-24efe1d32ef2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4814b1bc-1411-4fbb-a754-e37b5f7a8047" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_699e4fb3-df1c-40c1-89fd-24efe1d32ef2" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4814b1bc-1411-4fbb-a754-e37b5f7a8047" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_50a72b40-0f0b-4835-bd7f-8152a2e9251b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_699e4fb3-df1c-40c1-89fd-24efe1d32ef2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_50a72b40-0f0b-4835-bd7f-8152a2e9251b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_03c357b2-436b-4209-94ac-1ef9dd64b153" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_699e4fb3-df1c-40c1-89fd-24efe1d32ef2" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_03c357b2-436b-4209-94ac-1ef9dd64b153" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_bdc16cf1-3d93-4efe-b323-5322d845b14a" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_699e4fb3-df1c-40c1-89fd-24efe1d32ef2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_bdc16cf1-3d93-4efe-b323-5322d845b14a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_522adefe-0650-4595-97d5-38a970ed93d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_3ec2614f-76fe-4ac3-870c-3352c6cbd0e4" 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_7c59d2c4-c01b-44dc-990c-9cb5ab6235f0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_3ec2614f-76fe-4ac3-870c-3352c6cbd0e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_fe0f8e0d-07cd-41d2-822f-1ff0d22f16d4" 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_3ec2614f-76fe-4ac3-870c-3352c6cbd0e4" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_fe0f8e0d-07cd-41d2-822f-1ff0d22f16d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fe0f8e0d-07cd-41d2-822f-1ff0d22f16d4_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_fe0f8e0d-07cd-41d2-822f-1ff0d22f16d4" xlink:to="loc_us-gaap_EquityComponentDomain_fe0f8e0d-07cd-41d2-822f-1ff0d22f16d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3456196d-55f2-4ed4-a4f4-439a25eb8096" 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_fe0f8e0d-07cd-41d2-822f-1ff0d22f16d4" xlink:to="loc_us-gaap_EquityComponentDomain_3456196d-55f2-4ed4-a4f4-439a25eb8096" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_966ba4c4-8cc0-4253-b5df-11fbd0453390" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3456196d-55f2-4ed4-a4f4-439a25eb8096" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_966ba4c4-8cc0-4253-b5df-11fbd0453390" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_3c47fe0d-889c-4393-a4e5-e37b0d42d6b6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3456196d-55f2-4ed4-a4f4-439a25eb8096" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_3c47fe0d-889c-4393-a4e5-e37b0d42d6b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_d4683e23-0ecc-4d52-95dd-c8bfb9b049ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3456196d-55f2-4ed4-a4f4-439a25eb8096" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_d4683e23-0ecc-4d52-95dd-c8bfb9b049ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3ced4fd8-0700-463a-8138-ea5eb2972e31" 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_3456196d-55f2-4ed4-a4f4-439a25eb8096" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3ced4fd8-0700-463a-8138-ea5eb2972e31" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/InvestmentsSummaryofCashEquivalentsandShorttermInvestmentsDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#InvestmentsSummaryofCashEquivalentsandShorttermInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/InvestmentsSummaryofCashEquivalentsandShorttermInvestmentsDetails" xlink:type="extended" id="if9fe4762c01b4ceebdf7170541038100_InvestmentsSummaryofCashEquivalentsandShorttermInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsAtCarryingValue_36274e70-cf29-4fff-840c-622d1ba5e85d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_us-gaap_CashEquivalentsAtCarryingValue_36274e70-cf29-4fff-840c-622d1ba5e85d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_CashEquivalentsGrossUnrealizedGains_e56bb32a-2373-4585-b6be-0d87b3551910" xlink:href="amkr-20220930.xsd#amkr_CashEquivalentsGrossUnrealizedGains"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_CashEquivalentsGrossUnrealizedGains_e56bb32a-2373-4585-b6be-0d87b3551910" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_CashEquivalentsGrossUnrealizedLosses_2a4ca2bc-cafa-4e3f-b8eb-42df1f4a5c46" xlink:href="amkr-20220930.xsd#amkr_CashEquivalentsGrossUnrealizedLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_CashEquivalentsGrossUnrealizedLosses_2a4ca2bc-cafa-4e3f-b8eb-42df1f4a5c46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_CashEquivalentFairValueDisclosure_fd72df5c-4425-42a3-9d99-6d8582770820" xlink:href="amkr-20220930.xsd#amkr_CashEquivalentFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_CashEquivalentFairValueDisclosure_fd72df5c-4425-42a3-9d99-6d8582770820" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a21295d-5568-4692-9926-0c06a13f12d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_7a21295d-5568-4692-9926-0c06a13f12d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_4365c9ae-31f5-444b-a7bc-4cb6968b24d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_4365c9ae-31f5-444b-a7bc-4cb6968b24d5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_ef86ab72-b4bf-483e-b473-6e0f01a7a8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_ef86ab72-b4bf-483e-b473-6e0f01a7a8c7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_fec3b778-08fa-49f0-aa8a-513d19d81baf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_fec3b778-08fa-49f0-aa8a-513d19d81baf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAmortizedCost_795c4bca-3dd0-4b2c-984d-260c6da0aed7" xlink:href="amkr-20220930.xsd#amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAmortizedCost_795c4bca-3dd0-4b2c-984d-260c6da0aed7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAccumulatedGrossUnrealizedGainBeforeTax_0dd419d6-6e65-4b23-8432-376082de820e" xlink:href="amkr-20220930.xsd#amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAccumulatedGrossUnrealizedGainBeforeTax_0dd419d6-6e65-4b23-8432-376082de820e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAccumulatedGrossUnrealizedLossBeforeTax_3f9f68fa-47c1-44d1-81b9-d108cc6f5ff1" xlink:href="amkr-20220930.xsd#amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsAccumulatedGrossUnrealizedLossBeforeTax_3f9f68fa-47c1-44d1-81b9-d108cc6f5ff1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsFairValueDisclosure_150cb6b9-e30f-4050-94f1-28056ba62d16" xlink:href="amkr-20220930.xsd#amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_amkr_DebtSecuritiesAvailableForSaleAndCashEquivalentsFairValueDisclosure_150cb6b9-e30f-4050-94f1-28056ba62d16" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_9a143299-f662-44c4-9421-aa67f06103c7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d3258f41-f065-43f5-a361-747daca4d28b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_9a143299-f662-44c4-9421-aa67f06103c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f72a4b5e-7398-4f0a-849e-e0f1a84c0f48" 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_DebtSecuritiesAvailableForSaleTable_9a143299-f662-44c4-9421-aa67f06103c7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f72a4b5e-7398-4f0a-849e-e0f1a84c0f48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f72a4b5e-7398-4f0a-849e-e0f1a84c0f48_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_f72a4b5e-7398-4f0a-849e-e0f1a84c0f48" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f72a4b5e-7398-4f0a-849e-e0f1a84c0f48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bcd41b7d-382c-41aa-8e37-6879c7fbac8c" 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_f72a4b5e-7398-4f0a-849e-e0f1a84c0f48" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bcd41b7d-382c-41aa-8e37-6879c7fbac8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_30022a21-2a3d-4a18-833c-f3a3bbbd5556" 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_bcd41b7d-382c-41aa-8e37-6879c7fbac8c" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_30022a21-2a3d-4a18-833c-f3a3bbbd5556" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_eaaf0f71-99ea-4c0f-a1a9-63d9c4672dd9" 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_bcd41b7d-382c-41aa-8e37-6879c7fbac8c" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_eaaf0f71-99ea-4c0f-a1a9-63d9c4672dd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_679e00be-6914-4bb3-bc82-3d80921cd496" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_9a143299-f662-44c4-9421-aa67f06103c7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_679e00be-6914-4bb3-bc82-3d80921cd496" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_679e00be-6914-4bb3-bc82-3d80921cd496_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_679e00be-6914-4bb3-bc82-3d80921cd496" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_679e00be-6914-4bb3-bc82-3d80921cd496_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_c3e1e38e-393d-4f78-82fa-7d88be0612ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_679e00be-6914-4bb3-bc82-3d80921cd496" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_c3e1e38e-393d-4f78-82fa-7d88be0612ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_c3e1e38e-393d-4f78-82fa-7d88be0612ea" xlink:to="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_872ed36a-9c1b-4f2a-a374-951e9fa26922" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:to="loc_us-gaap_CommercialPaperMember_872ed36a-9c1b-4f2a-a374-951e9fa26922" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_016d4b8e-5559-4618-8c58-aa7016569c20" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_016d4b8e-5559-4618-8c58-aa7016569c20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_08e18c8a-589a-4381-9fd7-7cac2343b4ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:to="loc_us-gaap_MoneyMarketFundsMember_08e18c8a-589a-4381-9fd7-7cac2343b4ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_6e575bde-9d9e-473b-981e-064a429d76f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:to="loc_us-gaap_MunicipalBondsMember_6e575bde-9d9e-473b-981e-064a429d76f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_b659eecc-4452-4a5b-bc27-ba9596a6225d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashEquivalentsMember_530c2efc-dc0e-415e-b058-978a709e8b06" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_b659eecc-4452-4a5b-bc27-ba9596a6225d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_9e4c2a67-6993-4354-82ca-f7931df88423" 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_DebtSecuritiesAvailableForSaleTable_9a143299-f662-44c4-9421-aa67f06103c7" xlink:to="loc_us-gaap_FinancialInstrumentAxis_9e4c2a67-6993-4354-82ca-f7931df88423" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_9e4c2a67-6993-4354-82ca-f7931df88423_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_9e4c2a67-6993-4354-82ca-f7931df88423" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_9e4c2a67-6993-4354-82ca-f7931df88423_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b88d8f2d-0bf9-4601-8333-d0743c399bba" 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_9e4c2a67-6993-4354-82ca-f7931df88423" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b88d8f2d-0bf9-4601-8333-d0743c399bba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b88d8f2d-0bf9-4601-8333-d0743c399bba" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_0c62edb0-5196-4a38-82a5-5e27fb0a1f00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_0c62edb0-5196-4a38-82a5-5e27fb0a1f00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_75a8bb8b-4a23-4e4e-93e1-f473f3176ebb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_CertificatesOfDepositMember_75a8bb8b-4a23-4e4e-93e1-f473f3176ebb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_7e925c68-b888-41e4-ba3f-3175a8fb35ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_CommercialPaperMember_7e925c68-b888-41e4-ba3f-3175a8fb35ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_48b93c93-a46e-4f28-93d2-782a554b2c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_48b93c93-a46e-4f28-93d2-782a554b2c4d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentShorttermDebtSecuritiesMember_dfb1eb9a-2907-441c-b6b1-cc6f23a5907f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignGovernmentShorttermDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_ForeignGovernmentShorttermDebtSecuritiesMember_dfb1eb9a-2907-441c-b6b1-cc6f23a5907f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_f78471eb-aebe-41bf-94bf-b80af65f7e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_f78471eb-aebe-41bf-94bf-b80af65f7e8f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_3feaf767-ad23-453e-a1a1-4a19006f0043" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_MunicipalBondsMember_3feaf767-ad23-453e-a1a1-4a19006f0043" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_330a5845-c102-43e0-bc12-036624e7e21d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_330a5845-c102-43e0-bc12-036624e7e21d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDemandObligationMember_75b7581c-eaa7-486c-bef7-b935dccf3f4c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDemandObligationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermInvestmentsMember_8dbf947b-80f9-4b02-9bf2-a0c7779c4143" xlink:to="loc_us-gaap_VariableRateDemandObligationMember_75b7581c-eaa7-486c-bef7-b935dccf3f4c" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/InvestmentsValuationDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#InvestmentsValuationDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/InvestmentsValuationDetails" xlink:type="extended" id="i943137d49d9c4c34b3491a3b499846e7_InvestmentsValuationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_32071d9e-f228-4d7f-8405-80c56678a948" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_b7c4b7b4-5a4b-4bf8-aab0-eaaaea568987" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_32071d9e-f228-4d7f-8405-80c56678a948" xlink:to="loc_us-gaap_HeldToMaturitySecurities_b7c4b7b4-5a4b-4bf8-aab0-eaaaea568987" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_bef00513-a376-473f-86c8-e8dc63bdc580" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_32071d9e-f228-4d7f-8405-80c56678a948" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_bef00513-a376-473f-86c8-e8dc63bdc580" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_ea97ef63-07a5-4666-9843-c2d794116a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_32071d9e-f228-4d7f-8405-80c56678a948" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_ea97ef63-07a5-4666-9843-c2d794116a7b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_40c94246-38e8-41e1-9e01-2d1edf235862" 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_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_ea97ef63-07a5-4666-9843-c2d794116a7b" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_40c94246-38e8-41e1-9e01-2d1edf235862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_40c94246-38e8-41e1-9e01-2d1edf235862_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_40c94246-38e8-41e1-9e01-2d1edf235862" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_40c94246-38e8-41e1-9e01-2d1edf235862_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_18e0a525-f138-4772-b139-f2a91c9cc373" 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_40c94246-38e8-41e1-9e01-2d1edf235862" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_18e0a525-f138-4772-b139-f2a91c9cc373" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_7a4d80f6-0498-4e22-bb97-afab7043f163" 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_18e0a525-f138-4772-b139-f2a91c9cc373" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_7a4d80f6-0498-4e22-bb97-afab7043f163" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/FactoringofAccountsReceivableDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#FactoringofAccountsReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/FactoringofAccountsReceivableDetails" xlink:type="extended" id="i1447973efb414054b7de67b616f8a202_FactoringofAccountsReceivableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_amkr_FactoringofAccountsReceivableLineItems_ddc52542-233f-4a21-b7fe-838e0bbbd6e1" xlink:href="amkr-20220930.xsd#amkr_FactoringofAccountsReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_AccountsReceivableSoldwithoutRecourse_5d7a600c-b90f-49f0-812b-5a7813139104" xlink:href="amkr-20220930.xsd#amkr_AccountsReceivableSoldwithoutRecourse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_FactoringofAccountsReceivableLineItems_ddc52542-233f-4a21-b7fe-838e0bbbd6e1" xlink:to="loc_amkr_AccountsReceivableSoldwithoutRecourse_5d7a600c-b90f-49f0-812b-5a7813139104" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_FactoringofAccountsReceivableTable_cda3e3e3-29e5-4ac4-84fc-49315c19e1d5" xlink:href="amkr-20220930.xsd#amkr_FactoringofAccountsReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_amkr_FactoringofAccountsReceivableLineItems_ddc52542-233f-4a21-b7fe-838e0bbbd6e1" xlink:to="loc_amkr_FactoringofAccountsReceivableTable_cda3e3e3-29e5-4ac4-84fc-49315c19e1d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_FactoringofAccountsReceivableAxis_4a555fdb-3e44-4967-8426-a3630e671b80" xlink:href="amkr-20220930.xsd#amkr_FactoringofAccountsReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_amkr_FactoringofAccountsReceivableTable_cda3e3e3-29e5-4ac4-84fc-49315c19e1d5" xlink:to="loc_amkr_FactoringofAccountsReceivableAxis_4a555fdb-3e44-4967-8426-a3630e671b80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_FactoringofAccountsReceivableDomain_4a555fdb-3e44-4967-8426-a3630e671b80_default" xlink:href="amkr-20220930.xsd#amkr_FactoringofAccountsReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_amkr_FactoringofAccountsReceivableAxis_4a555fdb-3e44-4967-8426-a3630e671b80" xlink:to="loc_amkr_FactoringofAccountsReceivableDomain_4a555fdb-3e44-4967-8426-a3630e671b80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_FactoringofAccountsReceivableDomain_7b373787-0786-4526-9daf-34e04e08f7d3" xlink:href="amkr-20220930.xsd#amkr_FactoringofAccountsReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_amkr_FactoringofAccountsReceivableAxis_4a555fdb-3e44-4967-8426-a3630e671b80" xlink:to="loc_amkr_FactoringofAccountsReceivableDomain_7b373787-0786-4526-9daf-34e04e08f7d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TotalFactoredMember_47caa5f6-2e78-4c16-9c1b-02baffa52d6e" xlink:href="amkr-20220930.xsd#amkr_TotalFactoredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_FactoringofAccountsReceivableDomain_7b373787-0786-4526-9daf-34e04e08f7d3" xlink:to="loc_amkr_TotalFactoredMember_47caa5f6-2e78-4c16-9c1b-02baffa52d6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_FactoringFeesMember_60c071da-cf13-4be6-8e51-d5fe2c37eed5" xlink:href="amkr-20220930.xsd#amkr_FactoringFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_FactoringofAccountsReceivableDomain_7b373787-0786-4526-9daf-34e04e08f7d3" xlink:to="loc_amkr_FactoringFeesMember_60c071da-cf13-4be6-8e51-d5fe2c37eed5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/PropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#PropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/PropertyPlantandEquipmentDetails" xlink:type="extended" id="i7539634695534e188136d937b5740f87_PropertyPlantandEquipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7760623e-1d15-49b3-99ce-36a0d542f36a" 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_PropertyPlantAndEquipmentGross_35d15506-3cda-42b6-915d-7303dc201ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7760623e-1d15-49b3-99ce-36a0d542f36a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_35d15506-3cda-42b6-915d-7303dc201ff2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_29adf3e9-1cc8-4b8f-a71c-4fcf6369f53f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7760623e-1d15-49b3-99ce-36a0d542f36a" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_29adf3e9-1cc8-4b8f-a71c-4fcf6369f53f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_2e543295-7f47-4c08-9490-c893dbf052e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7760623e-1d15-49b3-99ce-36a0d542f36a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_2e543295-7f47-4c08-9490-c893dbf052e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_67a6d060-d319-484f-8ced-f0df446456af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7760623e-1d15-49b3-99ce-36a0d542f36a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_67a6d060-d319-484f-8ced-f0df446456af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_d3051ef3-f952-40f2-afdb-5dd8af28c828" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7760623e-1d15-49b3-99ce-36a0d542f36a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_d3051ef3-f952-40f2-afdb-5dd8af28c828" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_435b986c-e393-4c05-95d8-cac53a90c2d9" 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_7760623e-1d15-49b3-99ce-36a0d542f36a" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_435b986c-e393-4c05-95d8-cac53a90c2d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_c1003105-a1bc-448d-8fe0-f9a3728b46f1" 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_435b986c-e393-4c05-95d8-cac53a90c2d9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_c1003105-a1bc-448d-8fe0-f9a3728b46f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1003105-a1bc-448d-8fe0-f9a3728b46f1_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_c1003105-a1bc-448d-8fe0-f9a3728b46f1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1003105-a1bc-448d-8fe0-f9a3728b46f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_16135e8a-93e4-48fc-a046-5a38800feeac" 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_c1003105-a1bc-448d-8fe0-f9a3728b46f1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_2c653226-efd1-4ccf-98c1-51b952eda312" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:to="loc_us-gaap_LandMember_2c653226-efd1-4ccf-98c1-51b952eda312" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_4c1409c2-2fa4-4635-9d43-4751a7496b6e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_4c1409c2-2fa4-4635-9d43-4751a7496b6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_1030d94e-d194-4914-b4c0-1a06b3461541" 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_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_1030d94e-d194-4914-b4c0-1a06b3461541" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SoftwareAndComputerEquipmentMember_f79c5b88-d429-46eb-9a0d-d34749efa09f" xlink:href="amkr-20220930.xsd#amkr_SoftwareAndComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:to="loc_amkr_SoftwareAndComputerEquipmentMember_f79c5b88-d429-46eb-9a0d-d34749efa09f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_6a85ba93-93d5-4234-874d-f91b54f1a1d8" 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_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_6a85ba93-93d5-4234-874d-f91b54f1a1d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_d61ccb7a-f3f7-4bd9-a0d7-8181ed31b71c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_16135e8a-93e4-48fc-a046-5a38800feeac" xlink:to="loc_us-gaap_ConstructionInProgressMember_d61ccb7a-f3f7-4bd9-a0d7-8181ed31b71c" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/DebtDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/DebtDetails" xlink:type="extended" id="i08147bdc08274d5cbcbcc75830f6e271_DebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" 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_b1b66154-6ca2-4c88-a77d-ccfac7360944" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_b1b66154-6ca2-4c88-a77d-ccfac7360944" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_390a453f-8829-4722-a6ca-741658b9a77d" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_LongTermDebt_390a453f-8829-4722-a6ca-741658b9a77d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_c29e35b9-ab7d-4f62-b4bc-84c196edec59" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_c29e35b9-ab7d-4f62-b4bc-84c196edec59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_b86244e2-304e-4f9e-993e-a8255d9ab13a" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_LongTermDebtCurrent_b86244e2-304e-4f9e-993e-a8255d9ab13a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_308ec0e0-944a-4005-8138-b88db419349d" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_308ec0e0-944a-4005-8138-b88db419349d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6480606e-77d2-4d90-bb66-8be64bd8ed17" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6480606e-77d2-4d90-bb66-8be64bd8ed17" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_fb26c03f-4c6d-405d-8a2c-ca542be7a376" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_fb26c03f-4c6d-405d-8a2c-ca542be7a376" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_f6207dd5-9524-4d93-aff7-32c084311a13" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_f6207dd5-9524-4d93-aff7-32c084311a13" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_d40e916f-07a5-4686-a817-50b9fbb34c78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentTerm_d40e916f-07a5-4686-a817-50b9fbb34c78" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_LineOfCreditFacilityPaymentTerm_29893b07-8ec5-413f-bd7f-759bd648a627" xlink:href="amkr-20220930.xsd#amkr_LineOfCreditFacilityPaymentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_amkr_LineOfCreditFacilityPaymentTerm_29893b07-8ec5-413f-bd7f-759bd648a627" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_68178fce-787f-420b-9f32-862e3bc35851" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_68178fce-787f-420b-9f32-862e3bc35851" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_4fe73597-7796-48c1-92ee-b1bd9547bc10" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_4fe73597-7796-48c1-92ee-b1bd9547bc10" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtInstrumentNumberOfAnnualBorrowingsMaximum_c6eb1cee-c6a9-4eec-b2c8-05fea5f32232" xlink:href="amkr-20220930.xsd#amkr_DebtInstrumentNumberOfAnnualBorrowingsMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_amkr_DebtInstrumentNumberOfAnnualBorrowingsMaximum_c6eb1cee-c6a9-4eec-b2c8-05fea5f32232" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_7dadecfb-7eda-4676-b105-d59df3e89d28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_7dadecfb-7eda-4676-b105-d59df3e89d28" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtInstrumentGracePeriod_dee54c25-20b5-4ede-8a9c-2f09930de4ff" xlink:href="amkr-20220930.xsd#amkr_DebtInstrumentGracePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_amkr_DebtInstrumentGracePeriod_dee54c25-20b5-4ede-8a9c-2f09930de4ff" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_DebtInstrumentNumber_903dcca0-1fa2-4736-b962-b4803026e5f1" xlink:href="amkr-20220930.xsd#amkr_DebtInstrumentNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_amkr_DebtInstrumentNumber_903dcca0-1fa2-4736-b962-b4803026e5f1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_fd279366-5333-4090-aa61-ee5a48fbd4e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_fd279366-5333-4090-aa61-ee5a48fbd4e9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_ccf77375-c932-4c59-b188-be38e0c34826" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_ccf77375-c932-4c59-b188-be38e0c34826" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_LineOfCreditFacilityMaximumBorrowingCapacityBaseAmount_9b9a0686-524f-4057-baa9-742d072fea23" xlink:href="amkr-20220930.xsd#amkr_LineOfCreditFacilityMaximumBorrowingCapacityBaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_amkr_LineOfCreditFacilityMaximumBorrowingCapacityBaseAmount_9b9a0686-524f-4057-baa9-742d072fea23" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_LineOfCreditFacilityPercentageOfVariableBorrowings_2eff913d-210e-4924-b81f-1f36005bd6d3" xlink:href="amkr-20220930.xsd#amkr_LineOfCreditFacilityPercentageOfVariableBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_amkr_LineOfCreditFacilityPercentageOfVariableBorrowings_2eff913d-210e-4924-b81f-1f36005bd6d3" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_b90586f1-f2a9-4ff9-9d02-bbdcff17bcc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_b90586f1-f2a9-4ff9-9d02-bbdcff17bcc8" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCollateralAmount_edd73b4f-f817-48bd-8a73-ad177ba976b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCollateralAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentCollateralAmount_edd73b4f-f817-48bd-8a73-ad177ba976b9" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_dc15d4e0-f187-4afb-bd26-3f243c533b50" 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_e475543f-c1e0-4ef2-a962-06751e4f7137" xlink:to="loc_us-gaap_DebtInstrumentTable_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9d8dba5e-35cd-4287-b2c5-d2c1f748024c" 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_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9d8dba5e-35cd-4287-b2c5-d2c1f748024c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9d8dba5e-35cd-4287-b2c5-d2c1f748024c_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_9d8dba5e-35cd-4287-b2c5-d2c1f748024c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9d8dba5e-35cd-4287-b2c5-d2c1f748024c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_22f49d4e-1631-434a-b268-a2658a76ac77" 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_9d8dba5e-35cd-4287-b2c5-d2c1f748024c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_22f49d4e-1631-434a-b268-a2658a76ac77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_748252e9-349c-4899-aa12-6e7b1669cef5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_22f49d4e-1631-434a-b268-a2658a76ac77" xlink:to="loc_us-gaap_SeniorNotesMember_748252e9-349c-4899-aa12-6e7b1669cef5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_d543ecb1-c6fe-4568-8ef5-288ae3f3f6c4" 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_LongtermDebtTypeDomain_22f49d4e-1631-434a-b268-a2658a76ac77" xlink:to="loc_us-gaap_LineOfCreditMember_d543ecb1-c6fe-4568-8ef5-288ae3f3f6c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SubsidiaryTermLoansMember_1f4646e1-fecf-4f53-9d6e-79966f3d9754" xlink:href="amkr-20220930.xsd#amkr_SubsidiaryTermLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_22f49d4e-1631-434a-b268-a2658a76ac77" xlink:to="loc_amkr_SubsidiaryTermLoansMember_1f4646e1-fecf-4f53-9d6e-79966f3d9754" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_15d36b29-1e31-450d-85c2-411630238494" 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_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_us-gaap_DebtInstrumentAxis_15d36b29-1e31-450d-85c2-411630238494" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_15d36b29-1e31-450d-85c2-411630238494_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_15d36b29-1e31-450d-85c2-411630238494" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_15d36b29-1e31-450d-85c2-411630238494_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" 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_15d36b29-1e31-450d-85c2-411630238494" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SeniorNotesDueSeptember2027Member_e49d1791-cd1b-4339-b5f8-2554ecf90bcb" xlink:href="amkr-20220930.xsd#amkr_SeniorNotesDueSeptember2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_SeniorNotesDueSeptember2027Member_e49d1791-cd1b-4339-b5f8-2554ecf90bcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanDueApril2023Member_d3760d04-b06e-401f-9cb8-afd08523750e" xlink:href="amkr-20220930.xsd#amkr_TermLoanDueApril2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanDueApril2023Member_d3760d04-b06e-401f-9cb8-afd08523750e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateAt185DueApril2024Member_635b600b-8b56-4cc3-9564-43b85e41d7c3" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateAt185DueApril2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateAt185DueApril2024Member_635b600b-8b56-4cc3-9564-43b85e41d7c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanDueDecember2028Member_d65aad5d-3f11-4f96-badf-69624e5c330e" xlink:href="amkr-20220930.xsd#amkr_TermLoanDueDecember2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanDueDecember2028Member_d65aad5d-3f11-4f96-badf-69624e5c330e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateAt212DueDecember2028Member_82a0f473-8733-4229-b19b-f4988ccf78f5" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateAt212DueDecember2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateAt212DueDecember2028Member_82a0f473-8733-4229-b19b-f4988ccf78f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_ShorttermtermloanvariablerateMember_650d3ea2-7164-41b0-9d47-a225cf98a0bc" xlink:href="amkr-20220930.xsd#amkr_ShorttermtermloanvariablerateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_ShorttermtermloanvariablerateMember_650d3ea2-7164-41b0-9d47-a225cf98a0bc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanDueJune2022Member_ee1e2c07-85d9-4f66-b8cd-7daeabbd7b1b" xlink:href="amkr-20220930.xsd#amkr_TermLoanDueJune2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanDueJune2022Member_ee1e2c07-85d9-4f66-b8cd-7daeabbd7b1b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateat0.60DueJuly2022Member_e12c271e-d696-4166-ac8b-368381d709a0" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateat0.60DueJuly2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateat0.60DueJuly2022Member_e12c271e-d696-4166-ac8b-368381d709a0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateat1.30DueJuly2023Member_22d70f98-f7a1-437b-82c9-4c5e345a6600" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateat1.30DueJuly2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateat1.30DueJuly2023Member_22d70f98-f7a1-437b-82c9-4c5e345a6600" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateat1.35DueDecember2024Member_b6018711-2337-4705-8d8c-62abc7cff085" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateat1.35DueDecember2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateat1.35DueDecember2024Member_b6018711-2337-4705-8d8c-62abc7cff085" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateAt120DueDecember2025Member_6743909c-9aed-463e-bd92-9ab05ce6dcb4" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateAt120DueDecember2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateAt120DueDecember2025Member_6743909c-9aed-463e-bd92-9ab05ce6dcb4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateAt123DueDecember2026Member_2f0b5df4-0186-47fd-a558-3cda743c4164" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateAt123DueDecember2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanFixedRateAt123DueDecember2026Member_2f0b5df4-0186-47fd-a558-3cda743c4164" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanLIBORPlus110DueMarch2024Member_b52f4c4c-2bec-4978-8614-8e73cb6a759f" xlink:href="amkr-20220930.xsd#amkr_TermLoanLIBORPlus110DueMarch2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanLIBORPlus110DueMarch2024Member_b52f4c4c-2bec-4978-8614-8e73cb6a759f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanOneLIBORPlus110DueMarch2024Member_9b3f96fa-50ee-44d6-8c8e-8fe6c18ff7b2" xlink:href="amkr-20220930.xsd#amkr_TermLoanOneLIBORPlus110DueMarch2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_TermLoanLIBORPlus110DueMarch2024Member_b52f4c4c-2bec-4978-8614-8e73cb6a759f" xlink:to="loc_amkr_TermLoanOneLIBORPlus110DueMarch2024Member_9b3f96fa-50ee-44d6-8c8e-8fe6c18ff7b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanTwoLIBORPlus110DueMarch2024Member_95b5b8d3-b1ed-46ae-9971-c153fc5a504c" xlink:href="amkr-20220930.xsd#amkr_TermLoanTwoLIBORPlus110DueMarch2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_TermLoanLIBORPlus110DueMarch2024Member_b52f4c4c-2bec-4978-8614-8e73cb6a759f" xlink:to="loc_amkr_TermLoanTwoLIBORPlus110DueMarch2024Member_95b5b8d3-b1ed-46ae-9971-c153fc5a504c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanLIBORPlus080DueJune2025Member_2d81bcbe-011b-459e-a036-8127b53a715b" xlink:href="amkr-20220930.xsd#amkr_TermLoanLIBORPlus080DueJune2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanLIBORPlus080DueJune2025Member_2d81bcbe-011b-459e-a036-8127b53a715b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanLIBORPlus080DueJune2025OneAndTwoMember_4779f82c-2b9a-4c14-99e3-24f1d6927ff7" xlink:href="amkr-20220930.xsd#amkr_TermLoanLIBORPlus080DueJune2025OneAndTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_TermLoanLIBORPlus080DueJune2025Member_2d81bcbe-011b-459e-a036-8127b53a715b" xlink:to="loc_amkr_TermLoanLIBORPlus080DueJune2025OneAndTwoMember_4779f82c-2b9a-4c14-99e3-24f1d6927ff7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanLIBORPlus075Due2025Member_e01273c4-1b8b-4da3-8f58-05968d4a4a0c" xlink:href="amkr-20220930.xsd#amkr_TermLoanLIBORPlus075Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_TermLoanLIBORPlus075Due2025Member_e01273c4-1b8b-4da3-8f58-05968d4a4a0c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanLIBORPlus075Due2025OneAndTwoMember_85c250be-1f3c-496b-83f4-da50f2712c6f" xlink:href="amkr-20220930.xsd#amkr_TermLoanLIBORPlus075Due2025OneAndTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_TermLoanLIBORPlus075Due2025Member_e01273c4-1b8b-4da3-8f58-05968d4a4a0c" xlink:to="loc_amkr_TermLoanLIBORPlus075Due2025OneAndTwoMember_85c250be-1f3c-496b-83f4-da50f2712c6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueJuly2023Member_8af8b593-a7a7-4a87-b96f-803c9f98cb56" xlink:href="amkr-20220930.xsd#amkr_SeniorSecuredRevolvingCreditFacilitydueJuly2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueJuly2023Member_8af8b593-a7a7-4a87-b96f-803c9f98cb56" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_RevolvingCreditFacilitydueDecember2024Member_17665cbe-eff7-446e-bb02-f6c8bca70481" xlink:href="amkr-20220930.xsd#amkr_RevolvingCreditFacilitydueDecember2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_RevolvingCreditFacilitydueDecember2024Member_17665cbe-eff7-446e-bb02-f6c8bca70481" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SeniorSecuredRevolvingCreditFacilityDueMarch2027Member_c992993e-1bf9-450b-8355-c98d6b76ced8" xlink:href="amkr-20220930.xsd#amkr_SeniorSecuredRevolvingCreditFacilityDueMarch2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_SeniorSecuredRevolvingCreditFacilityDueMarch2027Member_c992993e-1bf9-450b-8355-c98d6b76ced8" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_A2022SingaporeRevolverMember_1c5d6ac9-62ff-4be4-8844-743b07835624" xlink:href="amkr-20220930.xsd#amkr_A2022SingaporeRevolverMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb1ec9c5-d59d-4a54-9642-69e5d09e87c9" xlink:to="loc_amkr_A2022SingaporeRevolverMember_1c5d6ac9-62ff-4be4-8844-743b07835624" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_27ac32cf-913f-4fc6-b01b-02925c1b5ada" 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_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_us-gaap_CreditFacilityAxis_27ac32cf-913f-4fc6-b01b-02925c1b5ada" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_27ac32cf-913f-4fc6-b01b-02925c1b5ada_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_27ac32cf-913f-4fc6-b01b-02925c1b5ada" xlink:to="loc_us-gaap_CreditFacilityDomain_27ac32cf-913f-4fc6-b01b-02925c1b5ada_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_0d777f09-5199-4ac9-b9fc-3c493a57a400" 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_27ac32cf-913f-4fc6-b01b-02925c1b5ada" xlink:to="loc_us-gaap_CreditFacilityDomain_0d777f09-5199-4ac9-b9fc-3c493a57a400" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_35e58dcf-44cf-48fe-a5c3-7d8296de3c59" 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_0d777f09-5199-4ac9-b9fc-3c493a57a400" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_35e58dcf-44cf-48fe-a5c3-7d8296de3c59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_fc2a1cc5-88c7-4709-a5a4-4865c81a8318" 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_DebtInstrumentTable_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_srt_StatementGeographicalAxis_fc2a1cc5-88c7-4709-a5a4-4865c81a8318" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_fc2a1cc5-88c7-4709-a5a4-4865c81a8318_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_fc2a1cc5-88c7-4709-a5a4-4865c81a8318" xlink:to="loc_srt_SegmentGeographicalDomain_fc2a1cc5-88c7-4709-a5a4-4865c81a8318_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" 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_fc2a1cc5-88c7-4709-a5a4-4865c81a8318" xlink:to="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_KR_3cad61c2-e527-4941-bc25-44b07ecf3ff9" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_KR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" xlink:to="loc_country_KR_3cad61c2-e527-4941-bc25-44b07ecf3ff9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_JP_0ad13d71-b212-41be-bf91-8ea44821a7de" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_JP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" xlink:to="loc_country_JP_0ad13d71-b212-41be-bf91-8ea44821a7de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_SG_b8e243bc-6d82-4cc5-a393-e5cf7e248336" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_SG"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" xlink:to="loc_country_SG_b8e243bc-6d82-4cc5-a393-e5cf7e248336" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_TW_25df12d8-fdf1-40a1-86c4-91223e8c31ce" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_TW"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" xlink:to="loc_country_TW_25df12d8-fdf1-40a1-86c4-91223e8c31ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_99c123c1-0767-4a8b-8e2b-f20e43133fda" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_bb5a4ca8-5a52-4f9f-a4e1-e465342cfad9" xlink:to="loc_country_CN_99c123c1-0767-4a8b-8e2b-f20e43133fda" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_ed899df9-05a4-4587-8202-7d5a01c6b1a8" 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_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_us-gaap_VariableRateAxis_ed899df9-05a4-4587-8202-7d5a01c6b1a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_ed899df9-05a4-4587-8202-7d5a01c6b1a8_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_ed899df9-05a4-4587-8202-7d5a01c6b1a8" xlink:to="loc_us-gaap_VariableRateDomain_ed899df9-05a4-4587-8202-7d5a01c6b1a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_852d8f27-988f-4f8a-910d-238b17be6754" 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_ed899df9-05a4-4587-8202-7d5a01c6b1a8" xlink:to="loc_us-gaap_VariableRateDomain_852d8f27-988f-4f8a-910d-238b17be6754" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_ApplicableBankRateMember_56aa8cf8-7f0b-47d4-af00-66fb881b9aa6" xlink:href="amkr-20220930.xsd#amkr_ApplicableBankRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_852d8f27-988f-4f8a-910d-238b17be6754" xlink:to="loc_amkr_ApplicableBankRateMember_56aa8cf8-7f0b-47d4-af00-66fb881b9aa6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TokyoInterbankOfferedRateTIBORMember_87a3629c-c13e-43f5-920b-80905438dd34" xlink:href="amkr-20220930.xsd#amkr_TokyoInterbankOfferedRateTIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_852d8f27-988f-4f8a-910d-238b17be6754" xlink:to="loc_amkr_TokyoInterbankOfferedRateTIBORMember_87a3629c-c13e-43f5-920b-80905438dd34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_f9ba8485-831e-45fa-a4bc-2753d1670ab1" 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_852d8f27-988f-4f8a-910d-238b17be6754" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_f9ba8485-831e-45fa-a4bc-2753d1670ab1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_58d6087c-5d4c-4b3b-90e4-ec3295cfde7c" 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_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_srt_RangeAxis_58d6087c-5d4c-4b3b-90e4-ec3295cfde7c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_58d6087c-5d4c-4b3b-90e4-ec3295cfde7c_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_58d6087c-5d4c-4b3b-90e4-ec3295cfde7c" xlink:to="loc_srt_RangeMember_58d6087c-5d4c-4b3b-90e4-ec3295cfde7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9d3cc03f-fa76-409a-91a6-801328c8b526" 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_58d6087c-5d4c-4b3b-90e4-ec3295cfde7c" xlink:to="loc_srt_RangeMember_9d3cc03f-fa76-409a-91a6-801328c8b526" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_35b040f2-8766-453f-839f-a2115b0028dc" 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_9d3cc03f-fa76-409a-91a6-801328c8b526" xlink:to="loc_srt_MinimumMember_35b040f2-8766-453f-839f-a2115b0028dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4bfe1011-de7a-4257-8e7f-5ff597088aa5" 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_9d3cc03f-fa76-409a-91a6-801328c8b526" xlink:to="loc_srt_MaximumMember_4bfe1011-de7a-4257-8e7f-5ff597088aa5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_41d14eac-7585-4380-8cbd-ac6f24bd5260" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9d3cc03f-fa76-409a-91a6-801328c8b526" xlink:to="loc_srt_WeightedAverageMember_41d14eac-7585-4380-8cbd-ac6f24bd5260" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_c033894b-aef8-43fd-b3b7-656cc238c848" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_dc15d4e0-f187-4afb-bd26-3f243c533b50" xlink:to="loc_us-gaap_PledgedStatusAxis_c033894b-aef8-43fd-b3b7-656cc238c848" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_c033894b-aef8-43fd-b3b7-656cc238c848_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_c033894b-aef8-43fd-b3b7-656cc238c848" xlink:to="loc_us-gaap_PledgedStatusDomain_c033894b-aef8-43fd-b3b7-656cc238c848_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_55eab625-09da-498e-b41f-cf6987cc5697" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_c033894b-aef8-43fd-b3b7-656cc238c848" xlink:to="loc_us-gaap_PledgedStatusDomain_55eab625-09da-498e-b41f-cf6987cc5697" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_483f578c-8b5d-42f4-8211-1ef535497b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_55eab625-09da-498e-b41f-cf6987cc5697" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_483f578c-8b5d-42f4-8211-1ef535497b4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cf662562-951f-43ee-ac9b-05ba645bc807" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cf662562-951f-43ee-ac9b-05ba645bc807_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0cf0e5c0-768c-4050-8de0-db3d95c3a556" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanLIBORPlus110DueMarch2024Member_7a04b5a8-cb2b-41ef-8fcc-3d260d37808e" xlink:href="amkr-20220930.xsd#amkr_TermLoanLIBORPlus110DueMarch2024Member"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_TermLoanFixedRateAt212DueDecember2028Member_be33ba38-198a-4084-82b5-e6a2b1a33892" xlink:href="amkr-20220930.xsd#amkr_TermLoanFixedRateAt212DueDecember2028Member"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/DerivativesDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#DerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/DerivativesDetails" xlink:type="extended" id="iaff4f5617e404b35b39977cbda38f12a_DerivativesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" 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_DerivativeAssetNotionalAmount_e0d4cb3f-c375-4c83-8954-56fd1728b843" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_e0d4cb3f-c375-4c83-8954-56fd1728b843" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_c898fa39-740c-41cd-a78c-196feed05665" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeAssets_c898fa39-740c-41cd-a78c-196feed05665" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_d1a687b9-5d3a-4afa-ad8e-6d982c39934c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeLiabilities_d1a687b9-5d3a-4afa-ad8e-6d982c39934c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_883719d8-8799-478f-aba1-c7fc19d6d8ec" 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_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_883719d8-8799-478f-aba1-c7fc19d6d8ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCurrentStatementOfFinancialPositionExtensibleEnumeration_80105063-ac34-40d5-8ed0-9e8551e5fbb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityCurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeLiabilityCurrentStatementOfFinancialPositionExtensibleEnumeration_80105063-ac34-40d5-8ed0-9e8551e5fbb8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration_713828c4-24fa-45e0-a418-a58d583144d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration_713828c4-24fa-45e0-a418-a58d583144d5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_c3ec39c4-9a9d-4258-b730-04e35138f3db" 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_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_c3ec39c4-9a9d-4258-b730-04e35138f3db" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a93f6d9a-2332-4c73-b41f-32ab3ba49bdd" 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_37d26c6a-65c6-48cc-803c-354299f35a97" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a93f6d9a-2332-4c73-b41f-32ab3ba49bdd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_08bbc948-51ca-4426-8f17-50850bc0d0eb" 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_a93f6d9a-2332-4c73-b41f-32ab3ba49bdd" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_08bbc948-51ca-4426-8f17-50850bc0d0eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_08bbc948-51ca-4426-8f17-50850bc0d0eb_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_08bbc948-51ca-4426-8f17-50850bc0d0eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_08bbc948-51ca-4426-8f17-50850bc0d0eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8c66d268-c802-41c0-9420-8988a4bb36a3" 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_08bbc948-51ca-4426-8f17-50850bc0d0eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8c66d268-c802-41c0-9420-8988a4bb36a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_c94e7ab6-97b5-43a7-9a78-a248244909d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8c66d268-c802-41c0-9420-8988a4bb36a3" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_c94e7ab6-97b5-43a7-9a78-a248244909d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_85aa2b32-be1c-45c1-9160-5738160f3a6e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a93f6d9a-2332-4c73-b41f-32ab3ba49bdd" xlink:to="loc_srt_CurrencyAxis_85aa2b32-be1c-45c1-9160-5738160f3a6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_85aa2b32-be1c-45c1-9160-5738160f3a6e_default" xlink:href="https://xbrl.sec.gov/currency/2022/currency-2022.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_85aa2b32-be1c-45c1-9160-5738160f3a6e" xlink:to="loc_currency_AllCurrenciesDomain_85aa2b32-be1c-45c1-9160-5738160f3a6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_2b538b83-87fd-4374-91f9-bda14e81dc31" xlink:href="https://xbrl.sec.gov/currency/2022/currency-2022.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_85aa2b32-be1c-45c1-9160-5738160f3a6e" xlink:to="loc_currency_AllCurrenciesDomain_2b538b83-87fd-4374-91f9-bda14e81dc31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_JPY_9086e6d0-8c1d-41e2-b776-023f5d4daec0" xlink:href="https://xbrl.sec.gov/currency/2022/currency-2022.xsd#currency_JPY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_2b538b83-87fd-4374-91f9-bda14e81dc31" xlink:to="loc_currency_JPY_9086e6d0-8c1d-41e2-b776-023f5d4daec0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_KRW_f39866e2-04ab-4a74-9c10-bdc61231d22c" xlink:href="https://xbrl.sec.gov/currency/2022/currency-2022.xsd#currency_KRW"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_2b538b83-87fd-4374-91f9-bda14e81dc31" xlink:to="loc_currency_KRW_f39866e2-04ab-4a74-9c10-bdc61231d22c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_PHP_82f4475f-1105-4838-ba27-09fa834a143d" xlink:href="https://xbrl.sec.gov/currency/2022/currency-2022.xsd#currency_PHP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_2b538b83-87fd-4374-91f9-bda14e81dc31" xlink:to="loc_currency_PHP_82f4475f-1105-4838-ba27-09fa834a143d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_SGD_3d3a84a5-7cb6-4023-913c-2d74b38188a3" xlink:href="https://xbrl.sec.gov/currency/2022/currency-2022.xsd#currency_SGD"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_2b538b83-87fd-4374-91f9-bda14e81dc31" xlink:to="loc_currency_SGD_3d3a84a5-7cb6-4023-913c-2d74b38188a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9f597739-85e0-4dec-97c1-ffe8943438f4" 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_a93f6d9a-2332-4c73-b41f-32ab3ba49bdd" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9f597739-85e0-4dec-97c1-ffe8943438f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9f597739-85e0-4dec-97c1-ffe8943438f4_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_9f597739-85e0-4dec-97c1-ffe8943438f4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9f597739-85e0-4dec-97c1-ffe8943438f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a7fbbfb0-4995-4cf9-9d3d-7618c274600f" 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_9f597739-85e0-4dec-97c1-ffe8943438f4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a7fbbfb0-4995-4cf9-9d3d-7618c274600f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_3bcca9fa-e669-4225-95d8-8c4dab941e9a" 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_a7fbbfb0-4995-4cf9-9d3d-7618c274600f" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_3bcca9fa-e669-4225-95d8-8c4dab941e9a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amkor.com/role/FairValueMeasurementsDebtDetails" xlink:type="simple" xlink:href="amkr-20220930.xsd#FairValueMeasurementsDebtDetails"/>
  <link:definitionLink xlink:role="http://www.amkor.com/role/FairValueMeasurementsDebtDetails" xlink:type="extended" id="ieadda777470f459ca009c8262c39ad06_FairValueMeasurementsDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_fd649381-9a48-428d-928d-1b764f87f185" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_06340921-989a-4640-a41c-2601349cef50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_fd649381-9a48-428d-928d-1b764f87f185" xlink:to="loc_us-gaap_DebtInstrumentFairValue_06340921-989a-4640-a41c-2601349cef50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_fd4d74de-0d4c-48ae-bbe2-57fc70909ad3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_fd649381-9a48-428d-928d-1b764f87f185" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_fd4d74de-0d4c-48ae-bbe2-57fc70909ad3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_582dc547-514a-40db-bb37-a5f719aa3983" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_fd4d74de-0d4c-48ae-bbe2-57fc70909ad3" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_582dc547-514a-40db-bb37-a5f719aa3983" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_582dc547-514a-40db-bb37-a5f719aa3983_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_582dc547-514a-40db-bb37-a5f719aa3983" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_582dc547-514a-40db-bb37-a5f719aa3983_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_52ba3ed8-e381-46ea-8535-f3dc193de337" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_582dc547-514a-40db-bb37-a5f719aa3983" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_52ba3ed8-e381-46ea-8535-f3dc193de337" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_e74cc6be-d99b-470c-933d-8f4bb899c79e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_52ba3ed8-e381-46ea-8535-f3dc193de337" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_e74cc6be-d99b-470c-933d-8f4bb899c79e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_9b64ca5f-a4b1-4ff3-93f5-8387f883ab07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_52ba3ed8-e381-46ea-8535-f3dc193de337" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_9b64ca5f-a4b1-4ff3-93f5-8387f883ab07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_d7d5b0f8-6eaf-4519-96a8-ac926423bee5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_52ba3ed8-e381-46ea-8535-f3dc193de337" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_d7d5b0f8-6eaf-4519-96a8-ac926423bee5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_a5f44edb-e60b-41f1-86a4-1d228edf188a" 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_FairValueByBalanceSheetGroupingTable_fd4d74de-0d4c-48ae-bbe2-57fc70909ad3" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_a5f44edb-e60b-41f1-86a4-1d228edf188a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_a5f44edb-e60b-41f1-86a4-1d228edf188a_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_a5f44edb-e60b-41f1-86a4-1d228edf188a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_a5f44edb-e60b-41f1-86a4-1d228edf188a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_12955b3a-7aed-4f23-a70c-60f91dc41cd8" 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_a5f44edb-e60b-41f1-86a4-1d228edf188a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_12955b3a-7aed-4f23-a70c-60f91dc41cd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_aebebe17-fed5-4785-bd8a-b66d21571a41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_12955b3a-7aed-4f23-a70c-60f91dc41cd8" xlink:to="loc_us-gaap_SeniorNotesMember_aebebe17-fed5-4785-bd8a-b66d21571a41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_amkr_SubsidiaryTermLoanAndRevolvingCreditFacilityMember_03a1a1c1-7f64-4b36-9617-1512d16ff629" xlink:href="amkr-20220930.xsd#amkr_SubsidiaryTermLoanAndRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_12955b3a-7aed-4f23-a70c-60f91dc41cd8" xlink:to="loc_amkr_SubsidiaryTermLoanAndRevolvingCreditFacilityMember_03a1a1c1-7f64-4b36-9617-1512d16ff629" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_a44ac1d0-0475-4cd8-a034-3940103cc4d6" 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_FairValueByBalanceSheetGroupingTable_fd4d74de-0d4c-48ae-bbe2-57fc70909ad3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_a44ac1d0-0475-4cd8-a034-3940103cc4d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a44ac1d0-0475-4cd8-a034-3940103cc4d6_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_a44ac1d0-0475-4cd8-a034-3940103cc4d6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a44ac1d0-0475-4cd8-a034-3940103cc4d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a05eb62f-6b23-4f7c-a6eb-fe64f9f78da1" 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_a44ac1d0-0475-4cd8-a034-3940103cc4d6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a05eb62f-6b23-4f7c-a6eb-fe64f9f78da1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_a1392f95-c378-4526-a6e7-f22f299843e0" 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_a05eb62f-6b23-4f7c-a6eb-fe64f9f78da1" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_a1392f95-c378-4526-a6e7-f22f299843e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_d4c8172d-f74a-4c37-9e34-64baa10eb737" 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_a05eb62f-6b23-4f7c-a6eb-fe64f9f78da1" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_d4c8172d-f74a-4c37-9e34-64baa10eb737" xlink:type="arc" order="1"/>
  </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_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_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
