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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:91eebaab-dc59-4744-a567-e12c614bec2b,g:d6a68377-81da-482b-b414-6ffcd45714fb-->
<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.scansource.com/role/CondensedConsolidatedStatementsofShareholdersEquityUnaudited" xlink:type="simple" xlink:href="scsc-20210930.xsd#CondensedConsolidatedStatementsofShareholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/CondensedConsolidatedStatementsofShareholdersEquityUnaudited" xlink:type="extended" id="i9e07ea68333b4a5c9e08cb86ecd35e65_CondensedConsolidatedStatementsofShareholdersEquityUnaudited">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_f6bed0bf-c0d0-481a-8d8f-741b5177b0f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6bed0bf-c0d0-481a-8d8f-741b5177b0f0" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_9b55ef13-79f6-498b-99a4-2ad6369011b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_SharesOutstanding_9b55ef13-79f6-498b-99a4-2ad6369011b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_e9c0dd93-adfc-4098-b010-36d2c4f37000" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_StockholdersEquity_e9c0dd93-adfc-4098-b010-36d2c4f37000" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e860ff5e-1079-46c3-bb93-3ea33ad5355a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_NetIncomeLoss_e860ff5e-1079-46c3-bb93-3ea33ad5355a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_47925064-572e-416f-a2d8-39ddacf061d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_47925064-572e-416f-a2d8-39ddacf061d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_4e2f2112-c2b6-4a71-b7f3-d71ae59883d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_4e2f2112-c2b6-4a71-b7f3-d71ae59883d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_6b1434cf-42a7-4220-87c8-3b26bab614f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_6b1434cf-42a7-4220-87c8-3b26bab614f8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_89017fd9-0372-4284-96b5-ad33b4838615" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_89017fd9-0372-4284-96b5-ad33b4838615" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_4b1c791a-b38c-4a52-936c-b788759b1d7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_e6afe16e-324c-49ae-81d2-c4e395625bc6" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_4b1c791a-b38c-4a52-936c-b788759b1d7c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_af4873fe-e531-47bc-a967-59746e53d210" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1039a223-f0b2-4136-8cd4-fa4f106402b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_a9463d68-a4e0-4205-b037-a7b23ea1b6e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_f6bed0bf-c0d0-481a-8d8f-741b5177b0f0" xlink:to="loc_us-gaap_StatementTable_a9463d68-a4e0-4205-b037-a7b23ea1b6e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_bc29d8a4-5905-405b-a0c3-ea43cabf5d96" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_a9463d68-a4e0-4205-b037-a7b23ea1b6e2" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_bc29d8a4-5905-405b-a0c3-ea43cabf5d96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_bc29d8a4-5905-405b-a0c3-ea43cabf5d96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_bc29d8a4-5905-405b-a0c3-ea43cabf5d96" xlink:to="loc_us-gaap_EquityComponentDomain_bc29d8a4-5905-405b-a0c3-ea43cabf5d96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_187fc064-abc5-4ab3-bb27-d7810acc3798" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_bc29d8a4-5905-405b-a0c3-ea43cabf5d96" xlink:to="loc_us-gaap_EquityComponentDomain_187fc064-abc5-4ab3-bb27-d7810acc3798" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_d07c5dac-0ced-4660-8f37-42bead7792a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_187fc064-abc5-4ab3-bb27-d7810acc3798" xlink:to="loc_us-gaap_CommonStockMember_d07c5dac-0ced-4660-8f37-42bead7792a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_ea466891-c802-4811-ba4e-f691c2dc1d89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_187fc064-abc5-4ab3-bb27-d7810acc3798" xlink:to="loc_us-gaap_RetainedEarningsMember_ea466891-c802-4811-ba4e-f691c2dc1d89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fbf1cf6c-5d6a-4ad1-9dd6-f1eb25a4f5d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_187fc064-abc5-4ab3-bb27-d7810acc3798" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fbf1cf6c-5d6a-4ad1-9dd6-f1eb25a4f5d2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/BusinessandSummaryofSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#BusinessandSummaryofSignificantAccountingPoliciesDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/BusinessandSummaryofSignificantAccountingPoliciesDetails" xlink:type="extended" id="i070de2bb696743c7b5c5040ee0d7ffaf_BusinessandSummaryofSignificantAccountingPoliciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_93ebc290-015e-4b34-9cc9-674bf7cf4072" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:to="loc_us-gaap_NumberOfOperatingSegments_93ebc290-015e-4b34-9cc9-674bf7cf4072" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_fccd827a-c13b-491a-af09-4f7603109c02" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_fccd827a-c13b-491a-af09-4f7603109c02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationNonproduction_5792ac6a-d7a0-4d98-8ec7-8504bd7d5d05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationNonproduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:to="loc_us-gaap_DepreciationNonproduction_5792ac6a-d7a0-4d98-8ec7-8504bd7d5d05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciation_0fd12d54-348e-4d55-83b1-93662b0ae437" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciation_0fd12d54-348e-4d55-83b1-93662b0ae437" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_18b41fc8-815f-4186-baba-9a27298606d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_18b41fc8-815f-4186-baba-9a27298606d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_6416908f-2842-4ed1-9db7-9c884488894e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_caac656d-a4e2-46f7-b08f-e214016e6807" xlink:to="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_6416908f-2842-4ed1-9db7-9c884488894e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_2e7ac949-1e79-40e4-8696-4eb64b64b9ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_6416908f-2842-4ed1-9db7-9c884488894e" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_2e7ac949-1e79-40e4-8696-4eb64b64b9ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_2e7ac949-1e79-40e4-8696-4eb64b64b9ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_2e7ac949-1e79-40e4-8696-4eb64b64b9ef" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_2e7ac949-1e79-40e4-8696-4eb64b64b9ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_64b124cd-027c-4a44-ad97-4aa44df129ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_2e7ac949-1e79-40e4-8696-4eb64b64b9ef" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_64b124cd-027c-4a44-ad97-4aa44df129ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOverdraftsMember_419611ca-78ee-4fd4-80f4-89976889022e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BankOverdraftsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_64b124cd-027c-4a44-ad97-4aa44df129ce" xlink:to="loc_us-gaap_BankOverdraftsMember_419611ca-78ee-4fd4-80f4-89976889022e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_9a8a52ab-4ad9-436d-a6e3-93aab6ba4b3c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_6416908f-2842-4ed1-9db7-9c884488894e" xlink:to="loc_srt_ProductOrServiceAxis_9a8a52ab-4ad9-436d-a6e3-93aab6ba4b3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9a8a52ab-4ad9-436d-a6e3-93aab6ba4b3c_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_9a8a52ab-4ad9-436d-a6e3-93aab6ba4b3c" xlink:to="loc_srt_ProductsAndServicesDomain_9a8a52ab-4ad9-436d-a6e3-93aab6ba4b3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0bb7e99a-4a5a-4b6c-8955-2f6540dc6ad5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_9a8a52ab-4ad9-436d-a6e3-93aab6ba4b3c" xlink:to="loc_srt_ProductsAndServicesDomain_0bb7e99a-4a5a-4b6c-8955-2f6540dc6ad5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_8753c583-4cc4-4436-982e-3342b0d6222e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0bb7e99a-4a5a-4b6c-8955-2f6540dc6ad5" xlink:to="loc_us-gaap_ProductMember_8753c583-4cc4-4436-982e-3342b0d6222e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/RevenueRecognitionDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#RevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/RevenueRecognitionDetails" xlink:type="extended" id="i772efa5c62884ae190bc040fc3ef9f02_RevenueRecognitionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_24f3a127-cd9e-4839-920b-04faa511dcc8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9cad50ea-7288-4e68-aaf3-c8d2c086f816" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_24f3a127-cd9e-4839-920b-04faa511dcc8" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9cad50ea-7288-4e68-aaf3-c8d2c086f816" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_873f91d4-9f2f-483c-9195-2bb9b4dd6d57" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_24f3a127-cd9e-4839-920b-04faa511dcc8" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_873f91d4-9f2f-483c-9195-2bb9b4dd6d57" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7f850545-4533-47df-ae36-ff31107436dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_873f91d4-9f2f-483c-9195-2bb9b4dd6d57" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7f850545-4533-47df-ae36-ff31107436dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7f850545-4533-47df-ae36-ff31107436dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7f850545-4533-47df-ae36-ff31107436dd" xlink:to="loc_us-gaap_SegmentDomain_7f850545-4533-47df-ae36-ff31107436dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_706903c1-cf61-4949-96da-e85e596ea7f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7f850545-4533-47df-ae36-ff31107436dd" xlink:to="loc_us-gaap_SegmentDomain_706903c1-cf61-4949-96da-e85e596ea7f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_SpecialtyTechnologySolutionsMember_2e857162-5fe3-4772-b741-7686c3f3f01f" xlink:href="scsc-20210930.xsd#scsc_SpecialtyTechnologySolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_706903c1-cf61-4949-96da-e85e596ea7f6" xlink:to="loc_scsc_SpecialtyTechnologySolutionsMember_2e857162-5fe3-4772-b741-7686c3f3f01f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ModernCommunicationsCloudMember_b71ddbb6-eea9-450a-bbe5-cded99ff7f63" xlink:href="scsc-20210930.xsd#scsc_ModernCommunicationsCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_706903c1-cf61-4949-96da-e85e596ea7f6" xlink:to="loc_scsc_ModernCommunicationsCloudMember_b71ddbb6-eea9-450a-bbe5-cded99ff7f63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_268b3ee5-3cea-43ff-b498-b66eb4bc01af" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_873f91d4-9f2f-483c-9195-2bb9b4dd6d57" xlink:to="loc_srt_ProductOrServiceAxis_268b3ee5-3cea-43ff-b498-b66eb4bc01af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_268b3ee5-3cea-43ff-b498-b66eb4bc01af_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_268b3ee5-3cea-43ff-b498-b66eb4bc01af" xlink:to="loc_srt_ProductsAndServicesDomain_268b3ee5-3cea-43ff-b498-b66eb4bc01af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7c04650c-03da-4cb9-ae09-97e1ad253247" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_268b3ee5-3cea-43ff-b498-b66eb4bc01af" xlink:to="loc_srt_ProductsAndServicesDomain_7c04650c-03da-4cb9-ae09-97e1ad253247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_HardwareSoftwareAndCloudMember_8a095e0c-8950-47be-a7e5-e7fbeafc1aea" xlink:href="scsc-20210930.xsd#scsc_HardwareSoftwareAndCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7c04650c-03da-4cb9-ae09-97e1ad253247" xlink:to="loc_scsc_HardwareSoftwareAndCloudMember_8a095e0c-8950-47be-a7e5-e7fbeafc1aea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_IntelisysConnectivityAndCloudMember_51e8a4d6-52d9-48c1-82f2-a4fe9c58a6e0" xlink:href="scsc-20210930.xsd#scsc_IntelisysConnectivityAndCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7c04650c-03da-4cb9-ae09-97e1ad253247" xlink:to="loc_scsc_IntelisysConnectivityAndCloudMember_51e8a4d6-52d9-48c1-82f2-a4fe9c58a6e0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#AccumulatedOtherComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="extended" id="i2accecc7e3654406ae3471499094fadd_AccumulatedOtherComprehensiveLossDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6e8f1442-d41f-46e8-9998-589c5164d302" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_da99e062-26bd-49aa-aa3a-4acf8fd69177" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6e8f1442-d41f-46e8-9998-589c5164d302" xlink:to="loc_us-gaap_StockholdersEquity_da99e062-26bd-49aa-aa3a-4acf8fd69177" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_e4da8314-4fec-4917-88ed-703cca4629c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6e8f1442-d41f-46e8-9998-589c5164d302" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_e4da8314-4fec-4917-88ed-703cca4629c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_a5cbc620-21eb-4da6-b9f3-9d68ddbdb20b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_e4da8314-4fec-4917-88ed-703cca4629c4" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_a5cbc620-21eb-4da6-b9f3-9d68ddbdb20b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a5cbc620-21eb-4da6-b9f3-9d68ddbdb20b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_a5cbc620-21eb-4da6-b9f3-9d68ddbdb20b" xlink:to="loc_us-gaap_EquityComponentDomain_a5cbc620-21eb-4da6-b9f3-9d68ddbdb20b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_03fc140b-85be-4f68-b768-41b4401cb75f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_a5cbc620-21eb-4da6-b9f3-9d68ddbdb20b" xlink:to="loc_us-gaap_EquityComponentDomain_03fc140b-85be-4f68-b768-41b4401cb75f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_6f9b0470-bb5e-4d98-9dde-e3529dd47aae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_03fc140b-85be-4f68-b768-41b4401cb75f" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_6f9b0470-bb5e-4d98-9dde-e3529dd47aae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_143a3ef2-ba07-4fa5-88b1-c43a777fcb37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_03fc140b-85be-4f68-b768-41b4401cb75f" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_143a3ef2-ba07-4fa5-88b1-c43a777fcb37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1ef28be4-28bc-4bc7-9cf8-4b4fe9a76eff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_03fc140b-85be-4f68-b768-41b4401cb75f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1ef28be4-28bc-4bc7-9cf8-4b4fe9a76eff" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/GoodwillandOtherIdentifiableIntangibleAssetsChangesintheCarryingAmountofGoodwillDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#GoodwillandOtherIdentifiableIntangibleAssetsChangesintheCarryingAmountofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/GoodwillandOtherIdentifiableIntangibleAssetsChangesintheCarryingAmountofGoodwillDetails" xlink:type="extended" id="id7e280106c1246319263f8f8b6808c04_GoodwillandOtherIdentifiableIntangibleAssetsChangesintheCarryingAmountofGoodwillDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7c90c2e3-61cb-4e67-ae5b-0eb9427209c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_232e4ddf-a785-4d9d-b5e3-90dea24ea6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c90c2e3-61cb-4e67-ae5b-0eb9427209c0" xlink:to="loc_us-gaap_GoodwillRollForward_232e4ddf-a785-4d9d-b5e3-90dea24ea6ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_4b78b462-681e-44ac-8b75-ab83fa0d609c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_232e4ddf-a785-4d9d-b5e3-90dea24ea6ad" xlink:to="loc_us-gaap_Goodwill_4b78b462-681e-44ac-8b75-ab83fa0d609c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7f249f0a-fa70-4d0c-93c1-478b5effb078" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_232e4ddf-a785-4d9d-b5e3-90dea24ea6ad" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7f249f0a-fa70-4d0c-93c1-478b5effb078" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_504ea611-4be8-49e4-8800-b9422fe5f4d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_ce83740d-ec69-4c43-8ca9-706863b3d46e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7c90c2e3-61cb-4e67-ae5b-0eb9427209c0" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_ce83740d-ec69-4c43-8ca9-706863b3d46e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3054c22a-3cbf-4c05-858c-08214b681203" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ce83740d-ec69-4c43-8ca9-706863b3d46e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3054c22a-3cbf-4c05-858c-08214b681203" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3054c22a-3cbf-4c05-858c-08214b681203_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3054c22a-3cbf-4c05-858c-08214b681203" xlink:to="loc_us-gaap_SegmentDomain_3054c22a-3cbf-4c05-858c-08214b681203_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_55708b63-b3f5-4159-aaa0-4d572bab61e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3054c22a-3cbf-4c05-858c-08214b681203" xlink:to="loc_us-gaap_SegmentDomain_55708b63-b3f5-4159-aaa0-4d572bab61e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_SpecialtyTechnologySolutionsMember_1c051c3a-75d5-4f03-8b50-76fb5036731d" xlink:href="scsc-20210930.xsd#scsc_SpecialtyTechnologySolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_55708b63-b3f5-4159-aaa0-4d572bab61e9" xlink:to="loc_scsc_SpecialtyTechnologySolutionsMember_1c051c3a-75d5-4f03-8b50-76fb5036731d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ModernCommunicationsCloudMember_368721e5-3f6b-46d6-8540-16a47066dd53" xlink:href="scsc-20210930.xsd#scsc_ModernCommunicationsCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_55708b63-b3f5-4159-aaa0-4d572bab61e9" xlink:to="loc_scsc_ModernCommunicationsCloudMember_368721e5-3f6b-46d6-8540-16a47066dd53" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/ShortTermBorrowingsandLongTermDebtScheduleofDebtDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#ShortTermBorrowingsandLongTermDebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/ShortTermBorrowingsandLongTermDebtScheduleofDebtDetails" xlink:type="extended" id="i8487dd24927f413eb9773c81376cc853_ShortTermBorrowingsandLongTermDebtScheduleofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_8de5d9fe-6e82-422a-ba15-912ada28b4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_969187a6-6a45-477d-b4ad-b6effee01716" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8de5d9fe-6e82-422a-ba15-912ada28b4ee" xlink:to="loc_us-gaap_LongTermDebtCurrent_969187a6-6a45-477d-b4ad-b6effee01716" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_e9d3fde1-be91-4e87-a898-48eb50ad5124" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8de5d9fe-6e82-422a-ba15-912ada28b4ee" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_e9d3fde1-be91-4e87-a898-48eb50ad5124" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_44f261c3-e277-4805-b53b-aaad66cf2d96" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8de5d9fe-6e82-422a-ba15-912ada28b4ee" xlink:to="loc_us-gaap_LineOfCredit_44f261c3-e277-4805-b53b-aaad66cf2d96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_23ea8c15-766f-4ec5-b4fa-af6c98f635d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8de5d9fe-6e82-422a-ba15-912ada28b4ee" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_23ea8c15-766f-4ec5-b4fa-af6c98f635d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ShortTermBorrowingsLineOfCreditAndLongTermDebtTable_b616f952-63e0-4875-8984-463642e9742f" xlink:href="scsc-20210930.xsd#scsc_ShortTermBorrowingsLineOfCreditAndLongTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8de5d9fe-6e82-422a-ba15-912ada28b4ee" xlink:to="loc_scsc_ShortTermBorrowingsLineOfCreditAndLongTermDebtTable_b616f952-63e0-4875-8984-463642e9742f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6a2d4e30-e06b-43f3-8f6c-54dafc58e01e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_scsc_ShortTermBorrowingsLineOfCreditAndLongTermDebtTable_b616f952-63e0-4875-8984-463642e9742f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6a2d4e30-e06b-43f3-8f6c-54dafc58e01e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6a2d4e30-e06b-43f3-8f6c-54dafc58e01e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6a2d4e30-e06b-43f3-8f6c-54dafc58e01e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6a2d4e30-e06b-43f3-8f6c-54dafc58e01e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e3f5aaac-7385-4b84-a78a-45bc68b5d7a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6a2d4e30-e06b-43f3-8f6c-54dafc58e01e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e3f5aaac-7385-4b84-a78a-45bc68b5d7a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_MississippiRevenueBondMember_fd5356e0-314f-4ffc-a819-6af0ff19a80e" xlink:href="scsc-20210930.xsd#scsc_MississippiRevenueBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e3f5aaac-7385-4b84-a78a-45bc68b5d7a7" xlink:to="loc_scsc_MississippiRevenueBondMember_fd5356e0-314f-4ffc-a819-6af0ff19a80e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_789d95c6-9944-4859-8bf4-761cfdb687b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_scsc_ShortTermBorrowingsLineOfCreditAndLongTermDebtTable_b616f952-63e0-4875-8984-463642e9742f" xlink:to="loc_us-gaap_CreditFacilityAxis_789d95c6-9944-4859-8bf4-761cfdb687b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_789d95c6-9944-4859-8bf4-761cfdb687b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_789d95c6-9944-4859-8bf4-761cfdb687b2" xlink:to="loc_us-gaap_CreditFacilityDomain_789d95c6-9944-4859-8bf4-761cfdb687b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_8c34980f-01b8-4934-8029-90dc83300c64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_789d95c6-9944-4859-8bf4-761cfdb687b2" xlink:to="loc_us-gaap_CreditFacilityDomain_8c34980f-01b8-4934-8029-90dc83300c64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_TermLoanFacilityMember_e493c9a4-7992-43bc-96af-ebe7aa3e1e23" xlink:href="scsc-20210930.xsd#scsc_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8c34980f-01b8-4934-8029-90dc83300c64" xlink:to="loc_scsc_TermLoanFacilityMember_e493c9a4-7992-43bc-96af-ebe7aa3e1e23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_MultiCurrencyRevolvingCreditFacilityMember_119723dd-1554-4f7b-bea2-0a81d2d77040" xlink:href="scsc-20210930.xsd#scsc_MultiCurrencyRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8c34980f-01b8-4934-8029-90dc83300c64" xlink:to="loc_scsc_MultiCurrencyRevolvingCreditFacilityMember_119723dd-1554-4f7b-bea2-0a81d2d77040" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_8d583e6e-88fc-4232-9471-a6bc17c0a8b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_scsc_ShortTermBorrowingsLineOfCreditAndLongTermDebtTable_b616f952-63e0-4875-8984-463642e9742f" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_8d583e6e-88fc-4232-9471-a6bc17c0a8b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_8d583e6e-88fc-4232-9471-a6bc17c0a8b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_8d583e6e-88fc-4232-9471-a6bc17c0a8b7" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_8d583e6e-88fc-4232-9471-a6bc17c0a8b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_2b11ede2-d15e-4cef-af53-63b22d1a766a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_8d583e6e-88fc-4232-9471-a6bc17c0a8b7" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_2b11ede2-d15e-4cef-af53-63b22d1a766a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_4d2305db-da20-4afc-a62a-47aa450eeb75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_2b11ede2-d15e-4cef-af53-63b22d1a766a" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_4d2305db-da20-4afc-a62a-47aa450eeb75" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/ShortTermBorrowingsandLongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#ShortTermBorrowingsandLongTermDebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/ShortTermBorrowingsandLongTermDebtNarrativeDetails" xlink:type="extended" id="ieb9b18e050ac4a8d8f980b1dc22b06b3_ShortTermBorrowingsandLongTermDebtNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2e794fe8-bba9-4495-8c27-62c6b3a7185c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2e794fe8-bba9-4495-8c27-62c6b3a7185c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_e1cfdde7-970c-4b71-95fb-c3f008d36bf3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_e1cfdde7-970c-4b71-95fb-c3f008d36bf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationPeriod_b2bd3482-dd76-46d6-9b33-6709633ad111" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationPeriod_b2bd3482-dd76-46d6-9b33-6709633ad111" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_ff4b6ec8-1f5a-4808-9116-af6acce1c972" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_ff4b6ec8-1f5a-4808-9116-af6acce1c972" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption_960f4af0-0b7b-4ea1-96df-c941f4ec1dbd" xlink:href="scsc-20210930.xsd#scsc_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption_960f4af0-0b7b-4ea1-96df-c941f4ec1dbd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_5f1e0bc1-536b-46bb-ae98-0a79722c6217" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_5f1e0bc1-536b-46bb-ae98-0a79722c6217" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_c077b09b-ec87-409b-9ff6-32c6a90d88a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_c077b09b-ec87-409b-9ff6-32c6a90d88a1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_169fd345-60da-4b04-9848-9321296503d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_Cash_169fd345-60da-4b04-9848-9321296503d8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DebtInstrumentCovenantRequirementLeverageRatioEbitdaNumberOfQuartersInMeasurementPeriod_ea11b6a8-5a43-4260-9e42-5f18b3cc30b3" xlink:href="scsc-20210930.xsd#scsc_DebtInstrumentCovenantRequirementLeverageRatioEbitdaNumberOfQuartersInMeasurementPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_DebtInstrumentCovenantRequirementLeverageRatioEbitdaNumberOfQuartersInMeasurementPeriod_ea11b6a8-5a43-4260-9e42-5f18b3cc30b3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_f9193353-29bb-4fbe-ab5f-f57651551079" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_f9193353-29bb-4fbe-ab5f-f57651551079" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_PercentageOfCapitalStockOrOtherEquityInterestPledgedPerCreditAgreement_24f39543-2740-4ad0-afaa-92c5173a1b34" xlink:href="scsc-20210930.xsd#scsc_PercentageOfCapitalStockOrOtherEquityInterestPledgedPerCreditAgreement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_PercentageOfCapitalStockOrOtherEquityInterestPledgedPerCreditAgreement_24f39543-2740-4ad0-afaa-92c5173a1b34" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_LineOfCreditFacilityLeverageRatio_cdde4907-9734-4304-90da-433e7fcd6ccd" xlink:href="scsc-20210930.xsd#scsc_LineOfCreditFacilityLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_LineOfCreditFacilityLeverageRatio_cdde4907-9734-4304-90da-433e7fcd6ccd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_LineOfCreditFacilityInterestCoverageRatio_4fecfb01-2fb4-4af0-aaab-c4000a65f0ff" xlink:href="scsc-20210930.xsd#scsc_LineOfCreditFacilityInterestCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_LineOfCreditFacilityInterestCoverageRatio_4fecfb01-2fb4-4af0-aaab-c4000a65f0ff" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_f0f37a38-58a8-424e-8148-e611fd1c0add" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_f0f37a38-58a8-424e-8148-e611fd1c0add" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_14ae3759-17b6-43a1-9244-c43f50b897fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_14ae3759-17b6-43a1-9244-c43f50b897fd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DebtInstrumentMaximumTimePeriodOfInterest_2208017c-598b-429d-827d-7021eded361a" xlink:href="scsc-20210930.xsd#scsc_DebtInstrumentMaximumTimePeriodOfInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_DebtInstrumentMaximumTimePeriodOfInterest_2208017c-598b-429d-827d-7021eded361a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DebtInstrumentExercisableOptionLimitationPeriod_199a49ce-b679-4744-a88a-46deb01abacf" xlink:href="scsc-20210930.xsd#scsc_DebtInstrumentExercisableOptionLimitationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_DebtInstrumentExercisableOptionLimitationPeriod_199a49ce-b679-4744-a88a-46deb01abacf" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_0f176fa7-df5d-44c6-b989-69e366a8c91d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_0f176fa7-df5d-44c6-b989-69e366a8c91d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_7e5d7283-90e1-47d5-aa6a-513ce0134ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtPercentageBearingVariableInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_7e5d7283-90e1-47d5-aa6a-513ce0134ac9" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_8104478f-1bd5-409a-b3de-a7acc66a50fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_8104478f-1bd5-409a-b3de-a7acc66a50fd" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DebtInstrumentAnniversaryOptionsExercisablePeriod_8b0ab60b-78fa-4b63-bc63-bad49b4117c9" xlink:href="scsc-20210930.xsd#scsc_DebtInstrumentAnniversaryOptionsExercisablePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_scsc_DebtInstrumentAnniversaryOptionsExercisablePeriod_8b0ab60b-78fa-4b63-bc63-bad49b4117c9" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_57527f6c-b6d7-4054-97f0-0987b9c21781" xlink:to="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_aff7edab-da8b-4098-b425-07f37f457be3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:to="loc_us-gaap_CreditFacilityAxis_aff7edab-da8b-4098-b425-07f37f457be3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_aff7edab-da8b-4098-b425-07f37f457be3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_aff7edab-da8b-4098-b425-07f37f457be3" xlink:to="loc_us-gaap_CreditFacilityDomain_aff7edab-da8b-4098-b425-07f37f457be3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_5f5a6725-d4e2-4542-b13d-03ba33feb1bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_aff7edab-da8b-4098-b425-07f37f457be3" xlink:to="loc_us-gaap_CreditFacilityDomain_5f5a6725-d4e2-4542-b13d-03ba33feb1bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_MultiCurrencyRevolvingCreditFacilityAmendedCreditAgreementMember_9872203d-a3cc-45d7-8288-f29b77ab4874" xlink:href="scsc-20210930.xsd#scsc_MultiCurrencyRevolvingCreditFacilityAmendedCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_5f5a6725-d4e2-4542-b13d-03ba33feb1bf" xlink:to="loc_scsc_MultiCurrencyRevolvingCreditFacilityAmendedCreditAgreementMember_9872203d-a3cc-45d7-8288-f29b77ab4874" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_TermLoanFacilityMember_9effb82c-bd63-463a-9ac2-a15a35b5622e" xlink:href="scsc-20210930.xsd#scsc_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_5f5a6725-d4e2-4542-b13d-03ba33feb1bf" xlink:to="loc_scsc_TermLoanFacilityMember_9effb82c-bd63-463a-9ac2-a15a35b5622e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_28775878-5584-4b1c-b4a7-ccbb55eed0d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_5f5a6725-d4e2-4542-b13d-03ba33feb1bf" xlink:to="loc_us-gaap_LetterOfCreditMember_28775878-5584-4b1c-b4a7-ccbb55eed0d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_46bb647b-7bc3-45db-9bd2-a62e55c2e20a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:to="loc_us-gaap_VariableRateAxis_46bb647b-7bc3-45db-9bd2-a62e55c2e20a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_46bb647b-7bc3-45db-9bd2-a62e55c2e20a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_46bb647b-7bc3-45db-9bd2-a62e55c2e20a" xlink:to="loc_us-gaap_VariableRateDomain_46bb647b-7bc3-45db-9bd2-a62e55c2e20a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_712401d4-8cc8-4774-b051-0ac4802d0ed0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_46bb647b-7bc3-45db-9bd2-a62e55c2e20a" xlink:to="loc_us-gaap_VariableRateDomain_712401d4-8cc8-4774-b051-0ac4802d0ed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_dd1dd8f9-08a1-46a4-b9a4-124ad9382d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_712401d4-8cc8-4774-b051-0ac4802d0ed0" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_dd1dd8f9-08a1-46a4-b9a4-124ad9382d7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_AlternateBaseRateLoansMember_3881941d-1678-4d46-9f49-c350ea5ba36b" xlink:href="scsc-20210930.xsd#scsc_AlternateBaseRateLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_712401d4-8cc8-4774-b051-0ac4802d0ed0" xlink:to="loc_scsc_AlternateBaseRateLoansMember_3881941d-1678-4d46-9f49-c350ea5ba36b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0d03802d-ba42-4a8b-8d53-67c2ebb66b82" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:to="loc_srt_RangeAxis_0d03802d-ba42-4a8b-8d53-67c2ebb66b82" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0d03802d-ba42-4a8b-8d53-67c2ebb66b82_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0d03802d-ba42-4a8b-8d53-67c2ebb66b82" xlink:to="loc_srt_RangeMember_0d03802d-ba42-4a8b-8d53-67c2ebb66b82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_85c942ca-f97c-4b06-8b44-44fcd0a7377b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0d03802d-ba42-4a8b-8d53-67c2ebb66b82" xlink:to="loc_srt_RangeMember_85c942ca-f97c-4b06-8b44-44fcd0a7377b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_0e71e82c-3deb-46df-8b00-def9cc9c0244" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_85c942ca-f97c-4b06-8b44-44fcd0a7377b" xlink:to="loc_srt_MinimumMember_0e71e82c-3deb-46df-8b00-def9cc9c0244" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c13caa19-5818-4ba2-ae8a-55a39aa8d914" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_85c942ca-f97c-4b06-8b44-44fcd0a7377b" xlink:to="loc_srt_MaximumMember_c13caa19-5818-4ba2-ae8a-55a39aa8d914" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_e8491b1a-69a1-4381-95c1-81b17d7aeca3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_e8491b1a-69a1-4381-95c1-81b17d7aeca3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e8491b1a-69a1-4381-95c1-81b17d7aeca3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e8491b1a-69a1-4381-95c1-81b17d7aeca3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e8491b1a-69a1-4381-95c1-81b17d7aeca3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4a9e0fdd-6328-436e-a7ff-2090350ccb39" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e8491b1a-69a1-4381-95c1-81b17d7aeca3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4a9e0fdd-6328-436e-a7ff-2090350ccb39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_MississippiRevenueBondMember_137d54c4-ee1f-4db8-902e-d45e6daf321b" xlink:href="scsc-20210930.xsd#scsc_MississippiRevenueBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4a9e0fdd-6328-436e-a7ff-2090350ccb39" xlink:to="loc_scsc_MississippiRevenueBondMember_137d54c4-ee1f-4db8-902e-d45e6daf321b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_a1bdf39c-b0d7-4a33-92fe-3f7455705616" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d95031ee-fcba-4d94-a751-fbbcb556b6a6" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_a1bdf39c-b0d7-4a33-92fe-3f7455705616" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_a1bdf39c-b0d7-4a33-92fe-3f7455705616_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_a1bdf39c-b0d7-4a33-92fe-3f7455705616" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_a1bdf39c-b0d7-4a33-92fe-3f7455705616_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_7e3adbd6-5430-4211-a8df-dfd4a77df4fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_a1bdf39c-b0d7-4a33-92fe-3f7455705616" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_7e3adbd6-5430-4211-a8df-dfd4a77df4fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_04a8b4fd-1399-410e-97e1-75b9b05fa127" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_7e3adbd6-5430-4211-a8df-dfd4a77df4fe" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_04a8b4fd-1399-410e-97e1-75b9b05fa127" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/DerivativesandHedgingActivitiesNarrativeDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#DerivativesandHedgingActivitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/DerivativesandHedgingActivitiesNarrativeDetails" xlink:type="extended" id="i6ac0d0e98e464a5eabc0f4161330778b_DerivativesandHedgingActivitiesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_1df94f7a-c08b-4bda-8987-b423547f395d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_19a0c83c-0501-4e50-a036-6686ba21b103" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_1df94f7a-c08b-4bda-8987-b423547f395d" xlink:to="loc_us-gaap_DerivativeNotionalAmount_19a0c83c-0501-4e50-a036-6686ba21b103" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_6ff1ab8e-ed0f-4e0a-aa19-1fc66fecb06f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_1df94f7a-c08b-4bda-8987-b423547f395d" xlink:to="loc_us-gaap_DerivativeTable_6ff1ab8e-ed0f-4e0a-aa19-1fc66fecb06f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_81e540e8-cb3f-4065-83f8-8523a348e747" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_6ff1ab8e-ed0f-4e0a-aa19-1fc66fecb06f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_81e540e8-cb3f-4065-83f8-8523a348e747" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_81e540e8-cb3f-4065-83f8-8523a348e747_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_81e540e8-cb3f-4065-83f8-8523a348e747" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_81e540e8-cb3f-4065-83f8-8523a348e747_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1eb2fe9d-3188-4309-a62d-e41599f7dc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_81e540e8-cb3f-4065-83f8-8523a348e747" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1eb2fe9d-3188-4309-a62d-e41599f7dc7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_661d7768-7a6e-4757-9dd8-c79270712f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1eb2fe9d-3188-4309-a62d-e41599f7dc7d" xlink:to="loc_us-gaap_ForeignExchangeContractMember_661d7768-7a6e-4757-9dd8-c79270712f1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_fdd489e6-f0ff-4139-8fbb-256f6e7c8069" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1eb2fe9d-3188-4309-a62d-e41599f7dc7d" xlink:to="loc_us-gaap_InterestRateSwapMember_fdd489e6-f0ff-4139-8fbb-256f6e7c8069" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_InterestRateSwapMaturingApril302024Member_c25fd585-fcf9-4cd0-ac9f-adb9c2130520" xlink:href="scsc-20210930.xsd#scsc_InterestRateSwapMaturingApril302024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_fdd489e6-f0ff-4139-8fbb-256f6e7c8069" xlink:to="loc_scsc_InterestRateSwapMaturingApril302024Member_c25fd585-fcf9-4cd0-ac9f-adb9c2130520" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_InterestRateSwapMaturingApril302026Member_791e2377-86ef-4611-9f62-0190b01a175a" xlink:href="scsc-20210930.xsd#scsc_InterestRateSwapMaturingApril302026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_fdd489e6-f0ff-4139-8fbb-256f6e7c8069" xlink:to="loc_scsc_InterestRateSwapMaturingApril302026Member_791e2377-86ef-4611-9f62-0190b01a175a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/DerivativesandHedgingActivitiesScheduleofCashFlowHedgeIncludedinAccumulatedOtherComprehensiveIncomeLossNetofIncomeTaxesDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#DerivativesandHedgingActivitiesScheduleofCashFlowHedgeIncludedinAccumulatedOtherComprehensiveIncomeLossNetofIncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/DerivativesandHedgingActivitiesScheduleofCashFlowHedgeIncludedinAccumulatedOtherComprehensiveIncomeLossNetofIncomeTaxesDetails" xlink:type="extended" id="i9465f3a74415427f9ab17ea9aa603e81_DerivativesandHedgingActivitiesScheduleofCashFlowHedgeIncludedinAccumulatedOtherComprehensiveIncomeLossNetofIncomeTaxesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_5a34bf36-6203-4f30-836b-f086a3b3b253" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_5a34bf36-6203-4f30-836b-f086a3b3b253" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_b32f65f9-ca52-4b57-9a3f-1a898004f088" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_b32f65f9-ca52-4b57-9a3f-1a898004f088" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent_c479d6b4-6817-4538-817f-b82b7ddf7abf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent_c479d6b4-6817-4538-817f-b82b7ddf7abf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent_027ffe04-f680-4d40-b8b7-f31f69dc2089" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent_027ffe04-f680-4d40-b8b7-f31f69dc2089" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_bab8de5b-4bc8-4de0-9c4a-694881ca44a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_bab8de5b-4bc8-4de0-9c4a-694881ca44a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_359066a7-8d97-472f-850c-c187f6f0a3d6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3ea21da5-705a-40e8-b5cd-850f5f675a14" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_359066a7-8d97-472f-850c-c187f6f0a3d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_a295ceab-677f-4dc4-be0f-714c13171759" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_359066a7-8d97-472f-850c-c187f6f0a3d6" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_a295ceab-677f-4dc4-be0f-714c13171759" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_a295ceab-677f-4dc4-be0f-714c13171759_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_a295ceab-677f-4dc4-be0f-714c13171759" xlink:to="loc_us-gaap_HedgingRelationshipDomain_a295ceab-677f-4dc4-be0f-714c13171759_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_8cebd44c-ca05-44c5-82c9-7848765718b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_a295ceab-677f-4dc4-be0f-714c13171759" xlink:to="loc_us-gaap_HedgingRelationshipDomain_8cebd44c-ca05-44c5-82c9-7848765718b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_14e5330c-c8f5-4516-b844-23925729f0fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_8cebd44c-ca05-44c5-82c9-7848765718b5" xlink:to="loc_us-gaap_InterestRateSwapMember_14e5330c-c8f5-4516-b844-23925729f0fa" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/DerivativesandHedgingActivitiesDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#DerivativesandHedgingActivitiesDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/DerivativesandHedgingActivitiesDerivativeInstrumentsDetails" xlink:type="extended" id="i7574cc0666c64eb08ca292e61a957fbb_DerivativesandHedgingActivitiesDerivativeInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_ec150cea-eda0-49c1-919c-e1715fb920fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_791a8744-1f9c-4567-8ea5-e38843f385d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_ec150cea-eda0-49c1-919c-e1715fb920fe" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_791a8744-1f9c-4567-8ea5-e38843f385d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_65ccbf75-6eb4-42a4-8274-680f6845cdab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_ec150cea-eda0-49c1-919c-e1715fb920fe" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_65ccbf75-6eb4-42a4-8274-680f6845cdab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_3e38e9a8-6427-44aa-abbd-5e7a4341e290" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_ec150cea-eda0-49c1-919c-e1715fb920fe" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_3e38e9a8-6427-44aa-abbd-5e7a4341e290" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_37eb1739-7b03-43fa-bd82-a11b7ed2a8f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_3e38e9a8-6427-44aa-abbd-5e7a4341e290" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_37eb1739-7b03-43fa-bd82-a11b7ed2a8f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_37eb1739-7b03-43fa-bd82-a11b7ed2a8f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_37eb1739-7b03-43fa-bd82-a11b7ed2a8f9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_37eb1739-7b03-43fa-bd82-a11b7ed2a8f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0991a5cf-f176-46d3-8f7d-596cb7566d29" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_37eb1739-7b03-43fa-bd82-a11b7ed2a8f9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0991a5cf-f176-46d3-8f7d-596cb7566d29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_f46e8836-73ef-4aa2-b714-c55ad06cf97a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0991a5cf-f176-46d3-8f7d-596cb7566d29" xlink:to="loc_us-gaap_ForeignExchangeContractMember_f46e8836-73ef-4aa2-b714-c55ad06cf97a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_18109f1a-fc38-4aee-af31-653ba180c489" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0991a5cf-f176-46d3-8f7d-596cb7566d29" xlink:to="loc_us-gaap_InterestRateSwapMember_18109f1a-fc38-4aee-af31-653ba180c489" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ForeignCurrencyHedgeMember_59f21453-35f5-48e0-afe3-58517e602334" xlink:href="scsc-20210930.xsd#scsc_ForeignCurrencyHedgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0991a5cf-f176-46d3-8f7d-596cb7566d29" xlink:to="loc_scsc_ForeignCurrencyHedgeMember_59f21453-35f5-48e0-afe3-58517e602334" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_75d30f8b-c423-4436-b928-dff73069e5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_3e38e9a8-6427-44aa-abbd-5e7a4341e290" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_75d30f8b-c423-4436-b928-dff73069e5e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_75d30f8b-c423-4436-b928-dff73069e5e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_75d30f8b-c423-4436-b928-dff73069e5e5" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_75d30f8b-c423-4436-b928-dff73069e5e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_6f161ef1-0866-4343-969a-b9da92757db9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_75d30f8b-c423-4436-b928-dff73069e5e5" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_6f161ef1-0866-4343-969a-b9da92757db9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_4dda2169-2cf5-478c-a181-0154372bfbbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_6f161ef1-0866-4343-969a-b9da92757db9" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_4dda2169-2cf5-478c-a181-0154372bfbbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_AccruedLiabilitiesAndOtherCurrentLiabilitiesMember_59897987-3baf-4d7c-a6be-0bbd20472629" xlink:href="scsc-20210930.xsd#scsc_AccruedLiabilitiesAndOtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_6f161ef1-0866-4343-969a-b9da92757db9" xlink:to="loc_scsc_AccruedLiabilitiesAndOtherCurrentLiabilitiesMember_59897987-3baf-4d7c-a6be-0bbd20472629" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_f34f528a-71da-4225-ac53-da1254c53116" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_6f161ef1-0866-4343-969a-b9da92757db9" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_f34f528a-71da-4225-ac53-da1254c53116" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_b545a46c-9f1f-4551-8ead-6fbf0afc794b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_3e38e9a8-6427-44aa-abbd-5e7a4341e290" xlink:to="loc_us-gaap_HedgingDesignationAxis_b545a46c-9f1f-4551-8ead-6fbf0afc794b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_b545a46c-9f1f-4551-8ead-6fbf0afc794b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_b545a46c-9f1f-4551-8ead-6fbf0afc794b" xlink:to="loc_us-gaap_HedgingDesignationDomain_b545a46c-9f1f-4551-8ead-6fbf0afc794b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_36e7c6e0-4745-4bea-8f3e-f07a0cad8a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_b545a46c-9f1f-4551-8ead-6fbf0afc794b" xlink:to="loc_us-gaap_HedgingDesignationDomain_36e7c6e0-4745-4bea-8f3e-f07a0cad8a0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_fa72d0ba-745e-4789-86ed-57907cce8b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_36e7c6e0-4745-4bea-8f3e-f07a0cad8a0b" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_fa72d0ba-745e-4789-86ed-57907cce8b8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_6cd388f5-e4d8-43fb-97a9-88000d8b4efb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_36e7c6e0-4745-4bea-8f3e-f07a0cad8a0b" xlink:to="loc_us-gaap_NondesignatedMember_6cd388f5-e4d8-43fb-97a9-88000d8b4efb" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/FairValueofFinancialInstrumentsScheduleofRemainingAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#FairValueofFinancialInstrumentsScheduleofRemainingAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/FairValueofFinancialInstrumentsScheduleofRemainingAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended" id="i941b7a352d1945ce8df5eeab4b7d3a02_FairValueofFinancialInstrumentsScheduleofRemainingAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_6b04195b-db2b-4273-a3bc-ab0471cf80b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_fd43394f-8fb0-40b7-8af5-13cffb17f3ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6b04195b-db2b-4273-a3bc-ab0471cf80b0" xlink:to="loc_us-gaap_AssetsAbstract_fd43394f-8fb0-40b7-8af5-13cffb17f3ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_1af743fb-7be0-4507-8164-8b5d7a72d67e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fd43394f-8fb0-40b7-8af5-13cffb17f3ff" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_1af743fb-7be0-4507-8164-8b5d7a72d67e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_f1fbbe9e-be67-49b0-a7ee-51cb0e6b571a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fd43394f-8fb0-40b7-8af5-13cffb17f3ff" xlink:to="loc_us-gaap_DerivativeAssets_f1fbbe9e-be67-49b0-a7ee-51cb0e6b571a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_cf1b2206-dc1e-4fa4-8cb1-d6de6dcbf1ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fd43394f-8fb0-40b7-8af5-13cffb17f3ff" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_cf1b2206-dc1e-4fa4-8cb1-d6de6dcbf1ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_cfacdf34-b1cb-4aa6-aa10-c30b8e33c3b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6b04195b-db2b-4273-a3bc-ab0471cf80b0" xlink:to="loc_us-gaap_LiabilitiesAbstract_cfacdf34-b1cb-4aa6-aa10-c30b8e33c3b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_e3978919-79c3-44a2-9913-7030ac519ede" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_cfacdf34-b1cb-4aa6-aa10-c30b8e33c3b4" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_e3978919-79c3-44a2-9913-7030ac519ede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_d6aae7a8-a34c-4e28-8674-9b70c86084ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_cfacdf34-b1cb-4aa6-aa10-c30b8e33c3b4" xlink:to="loc_us-gaap_DerivativeLiabilities_d6aae7a8-a34c-4e28-8674-9b70c86084ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_72a4dd65-35e2-4bf9-8044-ecdfdbc2eaca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_cfacdf34-b1cb-4aa6-aa10-c30b8e33c3b4" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_72a4dd65-35e2-4bf9-8044-ecdfdbc2eaca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f9a17208-9cde-4886-853d-82e2845e7866" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_6b04195b-db2b-4273-a3bc-ab0471cf80b0" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f9a17208-9cde-4886-853d-82e2845e7866" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_071cd379-a4cc-44d9-864a-c6923f04c89d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f9a17208-9cde-4886-853d-82e2845e7866" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_071cd379-a4cc-44d9-864a-c6923f04c89d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_071cd379-a4cc-44d9-864a-c6923f04c89d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_071cd379-a4cc-44d9-864a-c6923f04c89d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_071cd379-a4cc-44d9-864a-c6923f04c89d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_373d6cf7-4f28-46a3-9876-a4a1f69ac53a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_071cd379-a4cc-44d9-864a-c6923f04c89d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_373d6cf7-4f28-46a3-9876-a4a1f69ac53a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_c41bacf5-556c-42e3-a299-f360bcab5997" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_373d6cf7-4f28-46a3-9876-a4a1f69ac53a" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_c41bacf5-556c-42e3-a299-f360bcab5997" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_d4b13040-b523-443d-9433-616f231756f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_373d6cf7-4f28-46a3-9876-a4a1f69ac53a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_d4b13040-b523-443d-9433-616f231756f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_807d105c-5d27-42fc-8582-9291f6292d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_373d6cf7-4f28-46a3-9876-a4a1f69ac53a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_807d105c-5d27-42fc-8582-9291f6292d5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_f7b0b088-7d4b-4d9b-915b-29e98fb470ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f9a17208-9cde-4886-853d-82e2845e7866" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_f7b0b088-7d4b-4d9b-915b-29e98fb470ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f7b0b088-7d4b-4d9b-915b-29e98fb470ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f7b0b088-7d4b-4d9b-915b-29e98fb470ab" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f7b0b088-7d4b-4d9b-915b-29e98fb470ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_28d90114-cd99-40ac-8050-2c6dc31a44d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f7b0b088-7d4b-4d9b-915b-29e98fb470ab" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_28d90114-cd99-40ac-8050-2c6dc31a44d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_5f6333bf-0be8-4e92-a21e-9921760ab0db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_28d90114-cd99-40ac-8050-2c6dc31a44d0" xlink:to="loc_us-gaap_ForeignExchangeContractMember_5f6333bf-0be8-4e92-a21e-9921760ab0db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ForeignCurrencyHedgeMember_a462e0d9-5f10-4194-8cf8-df210d18087f" xlink:href="scsc-20210930.xsd#scsc_ForeignCurrencyHedgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_28d90114-cd99-40ac-8050-2c6dc31a44d0" xlink:to="loc_scsc_ForeignCurrencyHedgeMember_a462e0d9-5f10-4194-8cf8-df210d18087f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_ae74fdd2-6447-4eb8-9717-646e51b83bac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_28d90114-cd99-40ac-8050-2c6dc31a44d0" xlink:to="loc_us-gaap_InterestRateSwapMember_ae74fdd2-6447-4eb8-9717-646e51b83bac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1e3990b1-b407-4f92-a556-3f3e44937705" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f9a17208-9cde-4886-853d-82e2845e7866" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1e3990b1-b407-4f92-a556-3f3e44937705" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1e3990b1-b407-4f92-a556-3f3e44937705_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1e3990b1-b407-4f92-a556-3f3e44937705" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1e3990b1-b407-4f92-a556-3f3e44937705_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_01e88a66-3cf0-4920-acff-eb6caf6e1cf2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1e3990b1-b407-4f92-a556-3f3e44937705" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_01e88a66-3cf0-4920-acff-eb6caf6e1cf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_f92f99fe-b20b-4558-99fd-f6fb50f6223d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_01e88a66-3cf0-4920-acff-eb6caf6e1cf2" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_f92f99fe-b20b-4558-99fd-f6fb50f6223d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/FairValueofFinancialInstrumentsScheduleofChangesinFairValueofContingentConsiderationsDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#FairValueofFinancialInstrumentsScheduleofChangesinFairValueofContingentConsiderationsDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/FairValueofFinancialInstrumentsScheduleofChangesinFairValueofContingentConsiderationsDetails" xlink:type="extended" id="id1000d62dff747f3ad81ff7a410909fc_FairValueofFinancialInstrumentsScheduleofChangesinFairValueofContingentConsiderationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_281d8423-1008-4947-9407-9c8e4d354439" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_793af28a-97af-4cbc-abad-01605cc8d18e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_281d8423-1008-4947-9407-9c8e4d354439" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_793af28a-97af-4cbc-abad-01605cc8d18e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_b984ca1f-4e17-4df1-88b0-9ad05db4c185" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_793af28a-97af-4cbc-abad-01605cc8d18e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_b984ca1f-4e17-4df1-88b0-9ad05db4c185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_61ca4b31-e033-4725-bbab-f2e1df6e3d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_793af28a-97af-4cbc-abad-01605cc8d18e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_61ca4b31-e033-4725-bbab-f2e1df6e3d2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_7b5f60bf-b7d3-4c09-8bbe-95b8f46f3d04" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_0d592113-d049-428e-bcaf-f6af384f3e09" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_281d8423-1008-4947-9407-9c8e4d354439" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_0d592113-d049-428e-bcaf-f6af384f3e09" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_da316a25-728e-4237-8eba-d7c2772a0f87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_0d592113-d049-428e-bcaf-f6af384f3e09" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_da316a25-728e-4237-8eba-d7c2772a0f87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_da316a25-728e-4237-8eba-d7c2772a0f87_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_da316a25-728e-4237-8eba-d7c2772a0f87" xlink:to="loc_us-gaap_SegmentDomain_da316a25-728e-4237-8eba-d7c2772a0f87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f2f3dac3-a2bf-4a21-b71d-0b09761ba383" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_da316a25-728e-4237-8eba-d7c2772a0f87" xlink:to="loc_us-gaap_SegmentDomain_f2f3dac3-a2bf-4a21-b71d-0b09761ba383" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ModernCommunicationsCloudMember_d6f3be8d-a5a2-46f9-a249-bae6a2cb4451" xlink:href="scsc-20210930.xsd#scsc_ModernCommunicationsCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_f2f3dac3-a2bf-4a21-b71d-0b09761ba383" xlink:to="loc_scsc_ModernCommunicationsCloudMember_d6f3be8d-a5a2-46f9-a249-bae6a2cb4451" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_00028ab1-5b9f-46a8-bf57-969573d9b0c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_0d592113-d049-428e-bcaf-f6af384f3e09" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_00028ab1-5b9f-46a8-bf57-969573d9b0c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00028ab1-5b9f-46a8-bf57-969573d9b0c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_00028ab1-5b9f-46a8-bf57-969573d9b0c0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00028ab1-5b9f-46a8-bf57-969573d9b0c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ed7fb5cd-7589-491b-af26-2f2742e5311f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_00028ab1-5b9f-46a8-bf57-969573d9b0c0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ed7fb5cd-7589-491b-af26-2f2742e5311f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_525202d7-4940-4049-aed4-341aacca3765" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ed7fb5cd-7589-491b-af26-2f2742e5311f" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_525202d7-4940-4049-aed4-341aacca3765" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#FairValueofFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="extended" id="ifd0de4198c7643aebf1c8b99b62e75e0_FairValueofFinancialInstrumentsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_699e8776-8400-46b0-82ea-f41316c2d193" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_00036da2-15ef-462e-87c0-a27aa9098876" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_699e8776-8400-46b0-82ea-f41316c2d193" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_00036da2-15ef-462e-87c0-a27aa9098876" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8d53103d-c023-4a17-8007-a80703fecf2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_699e8776-8400-46b0-82ea-f41316c2d193" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8d53103d-c023-4a17-8007-a80703fecf2c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_21be4edf-a681-4ad0-9661-e496b78526cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8d53103d-c023-4a17-8007-a80703fecf2c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_21be4edf-a681-4ad0-9661-e496b78526cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_21be4edf-a681-4ad0-9661-e496b78526cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_21be4edf-a681-4ad0-9661-e496b78526cc" xlink:to="loc_us-gaap_SegmentDomain_21be4edf-a681-4ad0-9661-e496b78526cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_eee6bb43-6f76-4c0b-96cd-2c364b004cfa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_21be4edf-a681-4ad0-9661-e496b78526cc" xlink:to="loc_us-gaap_SegmentDomain_eee6bb43-6f76-4c0b-96cd-2c364b004cfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ModernCommunicationsCloudMember_ff58bddc-b317-4324-967f-81c1ea5c71cc" xlink:href="scsc-20210930.xsd#scsc_ModernCommunicationsCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_eee6bb43-6f76-4c0b-96cd-2c364b004cfa" xlink:to="loc_scsc_ModernCommunicationsCloudMember_ff58bddc-b317-4324-967f-81c1ea5c71cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_03681709-0461-44d9-8698-584511626453" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8d53103d-c023-4a17-8007-a80703fecf2c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_03681709-0461-44d9-8698-584511626453" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_03681709-0461-44d9-8698-584511626453_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_03681709-0461-44d9-8698-584511626453" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_03681709-0461-44d9-8698-584511626453_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_195d441e-5bb7-4c2e-a693-c2883d46e23d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_03681709-0461-44d9-8698-584511626453" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_195d441e-5bb7-4c2e-a693-c2883d46e23d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_IntelisysMember_7414410f-637c-4edb-976a-990c9a0b7f3d" xlink:href="scsc-20210930.xsd#scsc_IntelisysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_195d441e-5bb7-4c2e-a693-c2883d46e23d" xlink:to="loc_scsc_IntelisysMember_7414410f-637c-4edb-976a-990c9a0b7f3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_874840c6-d029-4c1b-83bf-dd2f9c10a555" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8d53103d-c023-4a17-8007-a80703fecf2c" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_874840c6-d029-4c1b-83bf-dd2f9c10a555" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_874840c6-d029-4c1b-83bf-dd2f9c10a555_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_874840c6-d029-4c1b-83bf-dd2f9c10a555" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_874840c6-d029-4c1b-83bf-dd2f9c10a555_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_519ac617-03f5-4969-8c78-2efdd6ff65eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_874840c6-d029-4c1b-83bf-dd2f9c10a555" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_519ac617-03f5-4969-8c78-2efdd6ff65eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_f3d9cb35-62ba-4215-b778-1f93ac9085cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_519ac617-03f5-4969-8c78-2efdd6ff65eb" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_f3d9cb35-62ba-4215-b778-1f93ac9085cc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/SegmentInformationFinancialInformationbySegmentDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#SegmentInformationFinancialInformationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/SegmentInformationFinancialInformationbySegmentDetails" xlink:type="extended" id="i9d54b6e63ebc4087b299c041db2afda0_SegmentInformationFinancialInformationbySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1003af05-c64d-4e80-bcd9-23771a44a32f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1003af05-c64d-4e80-bcd9-23771a44a32f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_c5d58b0c-9d0b-4a73-abe9-be8e0740f75b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:to="loc_us-gaap_DepreciationAndAmortization_c5d58b0c-9d0b-4a73-abe9-be8e0740f75b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_389572a1-b541-4084-9c14-86b660ed0251" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_389572a1-b541-4084-9c14-86b660ed0251" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_2891e47d-cd04-4ec9-bd55-5ff6a0ebf9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:to="loc_us-gaap_OperatingIncomeLoss_2891e47d-cd04-4ec9-bd55-5ff6a0ebf9a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_87c60b5e-fb03-404c-ae74-eae4e2321b37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_87c60b5e-fb03-404c-ae74-eae4e2321b37" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_78e2098c-883b-4476-ae1d-de21b6ce8fef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f1152cec-55fb-4dc2-83fa-25feb694b010" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_78e2098c-883b-4476-ae1d-de21b6ce8fef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7f86ae0b-c9a6-4528-a630-bb475bd352d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_78e2098c-883b-4476-ae1d-de21b6ce8fef" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7f86ae0b-c9a6-4528-a630-bb475bd352d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7f86ae0b-c9a6-4528-a630-bb475bd352d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7f86ae0b-c9a6-4528-a630-bb475bd352d0" xlink:to="loc_us-gaap_SegmentDomain_7f86ae0b-c9a6-4528-a630-bb475bd352d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_09f5fe01-945a-4567-bb94-d05f29a7aa6e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7f86ae0b-c9a6-4528-a630-bb475bd352d0" xlink:to="loc_us-gaap_SegmentDomain_09f5fe01-945a-4567-bb94-d05f29a7aa6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_SpecialtyTechnologySolutionsMember_b16fe238-40aa-4f2c-b86d-618d43e14acd" xlink:href="scsc-20210930.xsd#scsc_SpecialtyTechnologySolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_09f5fe01-945a-4567-bb94-d05f29a7aa6e" xlink:to="loc_scsc_SpecialtyTechnologySolutionsMember_b16fe238-40aa-4f2c-b86d-618d43e14acd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ModernCommunicationsCloudMember_60226241-8cda-4d7b-9f31-e89102c4ec6b" xlink:href="scsc-20210930.xsd#scsc_ModernCommunicationsCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_09f5fe01-945a-4567-bb94-d05f29a7aa6e" xlink:to="loc_scsc_ModernCommunicationsCloudMember_60226241-8cda-4d7b-9f31-e89102c4ec6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_e4f5ba1a-d5ad-4827-89a5-94df881f713a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_78e2098c-883b-4476-ae1d-de21b6ce8fef" xlink:to="loc_srt_ConsolidationItemsAxis_e4f5ba1a-d5ad-4827-89a5-94df881f713a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_e4f5ba1a-d5ad-4827-89a5-94df881f713a_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_e4f5ba1a-d5ad-4827-89a5-94df881f713a" xlink:to="loc_srt_ConsolidationItemsDomain_e4f5ba1a-d5ad-4827-89a5-94df881f713a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_6adb8ce6-21bf-45ae-ab15-0a8aa8d477ea" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_e4f5ba1a-d5ad-4827-89a5-94df881f713a" xlink:to="loc_srt_ConsolidationItemsDomain_6adb8ce6-21bf-45ae-ab15-0a8aa8d477ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_b6a4f22b-2c2a-4691-81f3-9ba9c52abd0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6adb8ce6-21bf-45ae-ab15-0a8aa8d477ea" xlink:to="loc_us-gaap_OperatingSegmentsMember_b6a4f22b-2c2a-4691-81f3-9ba9c52abd0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_31efd012-22a7-403e-bc52-1c108781d364" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6adb8ce6-21bf-45ae-ab15-0a8aa8d477ea" xlink:to="loc_us-gaap_CorporateNonSegmentMember_31efd012-22a7-403e-bc52-1c108781d364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ReportableGeographicalComponentsMember_100c86d2-6f81-42f6-b3fa-444256458f59" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ReportableGeographicalComponentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6adb8ce6-21bf-45ae-ab15-0a8aa8d477ea" xlink:to="loc_srt_ReportableGeographicalComponentsMember_100c86d2-6f81-42f6-b3fa-444256458f59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_GeographyEliminationsMember_653d1d8f-4f61-4daa-9c2b-e138f8cf5ea4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_GeographyEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6adb8ce6-21bf-45ae-ab15-0a8aa8d477ea" xlink:to="loc_srt_GeographyEliminationsMember_653d1d8f-4f61-4daa-9c2b-e138f8cf5ea4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_0ea5e5d4-8eef-4c64-a8d9-56b688d285be" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_78e2098c-883b-4476-ae1d-de21b6ce8fef" xlink:to="loc_srt_StatementGeographicalAxis_0ea5e5d4-8eef-4c64-a8d9-56b688d285be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_0ea5e5d4-8eef-4c64-a8d9-56b688d285be_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_0ea5e5d4-8eef-4c64-a8d9-56b688d285be" xlink:to="loc_srt_SegmentGeographicalDomain_0ea5e5d4-8eef-4c64-a8d9-56b688d285be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_036f849c-3944-4d49-8cd5-e4398dfb58f2" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_0ea5e5d4-8eef-4c64-a8d9-56b688d285be" xlink:to="loc_srt_SegmentGeographicalDomain_036f849c-3944-4d49-8cd5-e4398dfb58f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_UnitedStatesandCanadaMember_741a0044-7a5c-4c60-aac1-f0af16d6aa04" xlink:href="scsc-20210930.xsd#scsc_UnitedStatesandCanadaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_036f849c-3944-4d49-8cd5-e4398dfb58f2" xlink:to="loc_scsc_UnitedStatesandCanadaMember_741a0044-7a5c-4c60-aac1-f0af16d6aa04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_0260c094-77de-4f29-8d42-69610f805d04" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_036f849c-3944-4d49-8cd5-e4398dfb58f2" xlink:to="loc_us-gaap_NonUsMember_0260c094-77de-4f29-8d42-69610f805d04" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/SegmentInformationAssetsBySegmentDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#SegmentInformationAssetsBySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/SegmentInformationAssetsBySegmentDetails" xlink:type="extended" id="i04664c26e2f94f82b6f07cd02c5eadbc_SegmentInformationAssetsBySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_7c54602a-8d1d-4b2c-a53d-cd9350164a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_0a07e591-fb5a-41a0-904a-34b24139484b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7c54602a-8d1d-4b2c-a53d-cd9350164a0b" xlink:to="loc_us-gaap_Assets_0a07e591-fb5a-41a0-904a-34b24139484b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_b45699b7-5cac-482c-b638-bab7e5d178d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7c54602a-8d1d-4b2c-a53d-cd9350164a0b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_b45699b7-5cac-482c-b638-bab7e5d178d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f7ea0e3a-5a72-4dda-8734-5fa2d7b3cef6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7c54602a-8d1d-4b2c-a53d-cd9350164a0b" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f7ea0e3a-5a72-4dda-8734-5fa2d7b3cef6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a5b3d4be-7999-43ae-add5-b31be6fb090b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f7ea0e3a-5a72-4dda-8734-5fa2d7b3cef6" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a5b3d4be-7999-43ae-add5-b31be6fb090b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a5b3d4be-7999-43ae-add5-b31be6fb090b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5b3d4be-7999-43ae-add5-b31be6fb090b" xlink:to="loc_us-gaap_SegmentDomain_a5b3d4be-7999-43ae-add5-b31be6fb090b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9c5500a4-d281-4cc6-8e5b-067975bcbda4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5b3d4be-7999-43ae-add5-b31be6fb090b" xlink:to="loc_us-gaap_SegmentDomain_9c5500a4-d281-4cc6-8e5b-067975bcbda4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_SpecialtyTechnologySolutionsMember_83bf4475-3b72-46ff-b947-9a190d0ce1df" xlink:href="scsc-20210930.xsd#scsc_SpecialtyTechnologySolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9c5500a4-d281-4cc6-8e5b-067975bcbda4" xlink:to="loc_scsc_SpecialtyTechnologySolutionsMember_83bf4475-3b72-46ff-b947-9a190d0ce1df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_ModernCommunicationsCloudMember_6fa277a4-3007-4a56-a0f6-4e83faf28e35" xlink:href="scsc-20210930.xsd#scsc_ModernCommunicationsCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9c5500a4-d281-4cc6-8e5b-067975bcbda4" xlink:to="loc_scsc_ModernCommunicationsCloudMember_6fa277a4-3007-4a56-a0f6-4e83faf28e35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_862812d1-79a7-48e7-ace0-fe7e48202f57" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f7ea0e3a-5a72-4dda-8734-5fa2d7b3cef6" xlink:to="loc_srt_ConsolidationItemsAxis_862812d1-79a7-48e7-ace0-fe7e48202f57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_862812d1-79a7-48e7-ace0-fe7e48202f57_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_862812d1-79a7-48e7-ace0-fe7e48202f57" xlink:to="loc_srt_ConsolidationItemsDomain_862812d1-79a7-48e7-ace0-fe7e48202f57_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_9308560b-e35f-4cf6-b597-827d6493f1e7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_862812d1-79a7-48e7-ace0-fe7e48202f57" xlink:to="loc_srt_ConsolidationItemsDomain_9308560b-e35f-4cf6-b597-827d6493f1e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_9400c8bf-e0a9-40d7-aaf9-27db2c3b1561" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_9308560b-e35f-4cf6-b597-827d6493f1e7" xlink:to="loc_us-gaap_OperatingSegmentsMember_9400c8bf-e0a9-40d7-aaf9-27db2c3b1561" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_c35c9377-0cbb-4233-b3d8-43fadaecd5ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_9308560b-e35f-4cf6-b597-827d6493f1e7" xlink:to="loc_us-gaap_CorporateNonSegmentMember_c35c9377-0cbb-4233-b3d8-43fadaecd5ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_918c8b2e-1170-40ec-882f-c6e068936c34" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f7ea0e3a-5a72-4dda-8734-5fa2d7b3cef6" xlink:to="loc_srt_StatementGeographicalAxis_918c8b2e-1170-40ec-882f-c6e068936c34" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_918c8b2e-1170-40ec-882f-c6e068936c34_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_918c8b2e-1170-40ec-882f-c6e068936c34" xlink:to="loc_srt_SegmentGeographicalDomain_918c8b2e-1170-40ec-882f-c6e068936c34_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_48e5be32-132f-48f5-bab4-809633b1d28f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_918c8b2e-1170-40ec-882f-c6e068936c34" xlink:to="loc_srt_SegmentGeographicalDomain_48e5be32-132f-48f5-bab4-809633b1d28f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_UnitedStatesandCanadaMember_67350518-f117-49d9-9b54-2912b0f5cab8" xlink:href="scsc-20210930.xsd#scsc_UnitedStatesandCanadaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_48e5be32-132f-48f5-bab4-809633b1d28f" xlink:to="loc_scsc_UnitedStatesandCanadaMember_67350518-f117-49d9-9b54-2912b0f5cab8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_6549b9dc-8a4c-450e-92eb-318b27da54f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_48e5be32-132f-48f5-bab4-809633b1d28f" xlink:to="loc_us-gaap_NonUsMember_6549b9dc-8a4c-450e-92eb-318b27da54f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_aa8cf7dd-f4ba-484f-ac2f-ccc8ac03913a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_f7ea0e3a-5a72-4dda-8734-5fa2d7b3cef6" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_aa8cf7dd-f4ba-484f-ac2f-ccc8ac03913a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_aa8cf7dd-f4ba-484f-ac2f-ccc8ac03913a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_aa8cf7dd-f4ba-484f-ac2f-ccc8ac03913a" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_aa8cf7dd-f4ba-484f-ac2f-ccc8ac03913a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_420d63bb-8fb9-47c1-8af1-b751c63e7057" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_aa8cf7dd-f4ba-484f-ac2f-ccc8ac03913a" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_420d63bb-8fb9-47c1-8af1-b751c63e7057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentContinuingOperationsMember_137db3ba-9a93-4e10-8726-be344e411784" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_420d63bb-8fb9-47c1-8af1-b751c63e7057" xlink:to="loc_us-gaap_SegmentContinuingOperationsMember_137db3ba-9a93-4e10-8726-be344e411784" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/LeasesNarrativeDetails" xlink:type="extended" id="ia2a59cc271e24b4580510e11b17dbd9c_LeasesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_42001eb4-c761-4bd9-bf2f-a0069fb47d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_1fb61f3c-90cf-4288-bf74-32738eb8db0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42001eb4-c761-4bd9-bf2f-a0069fb47d3f" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_1fb61f3c-90cf-4288-bf74-32738eb8db0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_9b1cb985-1362-475e-8381-ffd095d93fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42001eb4-c761-4bd9-bf2f-a0069fb47d3f" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_9b1cb985-1362-475e-8381-ffd095d93fc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_5116ade1-7e82-4018-a55d-3960fc45617b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42001eb4-c761-4bd9-bf2f-a0069fb47d3f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_5116ade1-7e82-4018-a55d-3960fc45617b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_7516ecd0-257c-4e3f-854b-f8b17f50b642" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42001eb4-c761-4bd9-bf2f-a0069fb47d3f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_7516ecd0-257c-4e3f-854b-f8b17f50b642" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_a5941472-26d8-45c9-a440-a3b2f4b8eaaa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42001eb4-c761-4bd9-bf2f-a0069fb47d3f" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_a5941472-26d8-45c9-a440-a3b2f4b8eaaa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5a59c2b0-5bc5-41ae-91ea-78f9179aa9be" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_a5941472-26d8-45c9-a440-a3b2f4b8eaaa" xlink:to="loc_srt_RangeAxis_5a59c2b0-5bc5-41ae-91ea-78f9179aa9be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5a59c2b0-5bc5-41ae-91ea-78f9179aa9be_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5a59c2b0-5bc5-41ae-91ea-78f9179aa9be" xlink:to="loc_srt_RangeMember_5a59c2b0-5bc5-41ae-91ea-78f9179aa9be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_69dfbc9c-05ff-457a-b83c-ef3f058adab6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5a59c2b0-5bc5-41ae-91ea-78f9179aa9be" xlink:to="loc_srt_RangeMember_69dfbc9c-05ff-457a-b83c-ef3f058adab6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4517b1e2-803b-4350-a50a-669d08bda2f1" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_69dfbc9c-05ff-457a-b83c-ef3f058adab6" xlink:to="loc_srt_MinimumMember_4517b1e2-803b-4350-a50a-669d08bda2f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b3eede70-e559-4443-8b0e-175137803ec3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_69dfbc9c-05ff-457a-b83c-ef3f058adab6" xlink:to="loc_srt_MaximumMember_b3eede70-e559-4443-8b0e-175137803ec3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended" id="i78f6bcb861bc4a7eafa5aa45f1737907_CommitmentsandContingenciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_3193d6da-12d8-4c19-a007-24fba8da9345" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_BusinessAcquisitionCostOfAcquiredEntityCashHeldInEscrow_dd7c7574-4e6d-4161-9a34-96d0236cf454" xlink:href="scsc-20210930.xsd#scsc_BusinessAcquisitionCostOfAcquiredEntityCashHeldInEscrow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_3193d6da-12d8-4c19-a007-24fba8da9345" xlink:to="loc_scsc_BusinessAcquisitionCostOfAcquiredEntityCashHeldInEscrow_dd7c7574-4e6d-4161-9a34-96d0236cf454" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_5ea988df-5aea-4fa8-aa30-a2aa34d81a33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_3193d6da-12d8-4c19-a007-24fba8da9345" xlink:to="loc_us-gaap_OtherCommitmentsTable_5ea988df-5aea-4fa8-aa30-a2aa34d81a33" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_e782c7b6-2b66-4a38-a62d-9e6cb538e549" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_5ea988df-5aea-4fa8-aa30-a2aa34d81a33" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_e782c7b6-2b66-4a38-a62d-9e6cb538e549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e782c7b6-2b66-4a38-a62d-9e6cb538e549_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_e782c7b6-2b66-4a38-a62d-9e6cb538e549" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e782c7b6-2b66-4a38-a62d-9e6cb538e549_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dee88cdc-66b6-4e68-bc02-e3a8453742c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_e782c7b6-2b66-4a38-a62d-9e6cb538e549" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dee88cdc-66b6-4e68-bc02-e3a8453742c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_Network1Member_7774df6f-f713-43fd-a8f4-339712367d53" xlink:href="scsc-20210930.xsd#scsc_Network1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dee88cdc-66b6-4e68-bc02-e3a8453742c4" xlink:to="loc_scsc_Network1Member_7774df6f-f713-43fd-a8f4-339712367d53" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/CommitmentsandContingenciesSummaryofPreAcquisitionContingenciesDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#CommitmentsandContingenciesSummaryofPreAcquisitionContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/CommitmentsandContingenciesSummaryofPreAcquisitionContingenciesDetails" xlink:type="extended" id="iebd65e9e1f034a339f1a329061446e6c_CommitmentsandContingenciesSummaryofPreAcquisitionContingenciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_e97cd4e2-8665-47ef-b1eb-83dd86441ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_7ec514ef-8379-49d9-8b91-380e50c3f96a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_e97cd4e2-8665-47ef-b1eb-83dd86441ac9" xlink:to="loc_us-gaap_AssetsAbstract_7ec514ef-8379-49d9-8b91-380e50c3f96a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_27be9cbf-af16-4cfe-b6af-f6751930510d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7ec514ef-8379-49d9-8b91-380e50c3f96a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_27be9cbf-af16-4cfe-b6af-f6751930510d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_8ab2f7c5-3cc8-426f-803a-2c85232097f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7ec514ef-8379-49d9-8b91-380e50c3f96a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_8ab2f7c5-3cc8-426f-803a-2c85232097f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_1297f70e-5df1-4de6-9d3a-81cfb4582d58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_e97cd4e2-8665-47ef-b1eb-83dd86441ac9" xlink:to="loc_us-gaap_LiabilitiesAbstract_1297f70e-5df1-4de6-9d3a-81cfb4582d58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_5764739d-ee62-4b45-afa1-f07433e1d28a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1297f70e-5df1-4de6-9d3a-81cfb4582d58" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_5764739d-ee62-4b45-afa1-f07433e1d28a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_694b0b8d-3fde-458e-a57b-5f8516cf2b93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1297f70e-5df1-4de6-9d3a-81cfb4582d58" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_694b0b8d-3fde-458e-a57b-5f8516cf2b93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_300005df-86a8-4719-9308-cc1c6c0ff062" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_e97cd4e2-8665-47ef-b1eb-83dd86441ac9" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_300005df-86a8-4719-9308-cc1c6c0ff062" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_cbbd4674-40f4-43cc-8d3e-8661839e2465" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_300005df-86a8-4719-9308-cc1c6c0ff062" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_cbbd4674-40f4-43cc-8d3e-8661839e2465" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cbbd4674-40f4-43cc-8d3e-8661839e2465_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cbbd4674-40f4-43cc-8d3e-8661839e2465" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cbbd4674-40f4-43cc-8d3e-8661839e2465_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f0946b81-6fde-4146-ac06-8c3fa1e0d6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cbbd4674-40f4-43cc-8d3e-8661839e2465" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f0946b81-6fde-4146-ac06-8c3fa1e0d6b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_Network1Member_8d8dae1e-0e57-449b-939d-c272dbd816a5" xlink:href="scsc-20210930.xsd#scsc_Network1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f0946b81-6fde-4146-ac06-8c3fa1e0d6b1" xlink:to="loc_scsc_Network1Member_8d8dae1e-0e57-449b-939d-c272dbd816a5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/RestructuringSummaryofRestructuringandSeveranceCostsBySegmentDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#RestructuringSummaryofRestructuringandSeveranceCostsBySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/RestructuringSummaryofRestructuringandSeveranceCostsBySegmentDetails" xlink:type="extended" id="i410aa8e40f414e7aa9f207b6b1565f3d_RestructuringSummaryofRestructuringandSeveranceCostsBySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_b73de284-77ba-4bf7-94c8-fb0ec9a26c02" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_04404110-75cc-4592-b84c-4cc71a039adf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b73de284-77ba-4bf7-94c8-fb0ec9a26c02" xlink:to="loc_us-gaap_RestructuringCharges_04404110-75cc-4592-b84c-4cc71a039adf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_22a1bb6a-d480-484e-81d8-bb2498dd549a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b73de284-77ba-4bf7-94c8-fb0ec9a26c02" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_22a1bb6a-d480-484e-81d8-bb2498dd549a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_b8713f71-6cbf-4554-9dae-ce89d71675aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_22a1bb6a-d480-484e-81d8-bb2498dd549a" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_b8713f71-6cbf-4554-9dae-ce89d71675aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_b8713f71-6cbf-4554-9dae-ce89d71675aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_b8713f71-6cbf-4554-9dae-ce89d71675aa" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_b8713f71-6cbf-4554-9dae-ce89d71675aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_ff69a279-9931-40be-8187-50d576057c23" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_b8713f71-6cbf-4554-9dae-ce89d71675aa" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_ff69a279-9931-40be-8187-50d576057c23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_936ced50-52ef-42d6-9236-1cc24e2bd2ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_ff69a279-9931-40be-8187-50d576057c23" xlink:to="loc_us-gaap_EmployeeSeveranceMember_936ced50-52ef-42d6-9236-1cc24e2bd2ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_3dedf6a7-0eaf-40f9-bdf4-5605e7e2c9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_ff69a279-9931-40be-8187-50d576057c23" xlink:to="loc_us-gaap_OtherRestructuringMember_3dedf6a7-0eaf-40f9-bdf4-5605e7e2c9a0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/DiscontinuedOperationsNarrativeDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#DiscontinuedOperationsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/DiscontinuedOperationsNarrativeDetails" xlink:type="extended" id="i9ef73f684fa8482d83486b2071bb4dfc_DiscontinuedOperationsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_26e73694-9d52-473c-a090-a28e6b124af4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification_374a6b6d-c087-45bf-a819-49e5caa8b209" xlink:href="scsc-20210930.xsd#scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_26e73694-9d52-473c-a090-a28e6b124af4" xlink:to="loc_scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification_374a6b6d-c087-45bf-a819-49e5caa8b209" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_1a3f456e-68f6-4629-992b-e767d8c1e2c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_26e73694-9d52-473c-a090-a28e6b124af4" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_1a3f456e-68f6-4629-992b-e767d8c1e2c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_29a398e6-5441-4468-b813-ab28e030ac0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_26e73694-9d52-473c-a090-a28e6b124af4" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_29a398e6-5441-4468-b813-ab28e030ac0e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_42a28bbf-19ba-4982-af62-06c316ae0e9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_29a398e6-5441-4468-b813-ab28e030ac0e" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_42a28bbf-19ba-4982-af62-06c316ae0e9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_42a28bbf-19ba-4982-af62-06c316ae0e9c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_42a28bbf-19ba-4982-af62-06c316ae0e9c" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_42a28bbf-19ba-4982-af62-06c316ae0e9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_3eefc3a9-8633-4e62-8a55-0e50f693ff00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_42a28bbf-19ba-4982-af62-06c316ae0e9c" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_3eefc3a9-8633-4e62-8a55-0e50f693ff00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_bcfab76b-999b-41b3-94f5-4bf1a4064562" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_3eefc3a9-8633-4e62-8a55-0e50f693ff00" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_bcfab76b-999b-41b3-94f5-4bf1a4064562" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/DiscontinuedOperationsComponentofNetLossDiscontinuedOperationsDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#DiscontinuedOperationsComponentofNetLossDiscontinuedOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/DiscontinuedOperationsComponentofNetLossDiscontinuedOperationsDetails" xlink:type="extended" id="i998eefbeca6244338236277ef15e007c_DiscontinuedOperationsComponentofNetLossDiscontinuedOperationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_c7f270f3-b109-486d-9f47-cd5368282a0c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_c7f270f3-b109-486d-9f47-cd5368282a0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_92369a09-6d3f-45fc-b040-b8c66c5883d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_92369a09-6d3f-45fc-b040-b8c66c5883d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_e3da727d-5633-443d-9eb3-f81a1bfed0fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_e3da727d-5633-443d-9eb3-f81a1bfed0fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_1269ae70-6d5a-4024-a61f-58d073749b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_1269ae70-6d5a-4024-a61f-58d073749b0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_8d055ab2-3543-4462-a096-715837fc9d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_8d055ab2-3543-4462-a096-715837fc9d3f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense_770c8c5c-ddff-4c33-986f-53bff4e45446" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense_770c8c5c-ddff-4c33-986f-53bff4e45446" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification_148e805e-1f1c-418a-83d2-3929529f42a3" xlink:href="scsc-20210930.xsd#scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification_148e805e-1f1c-418a-83d2-3929529f42a3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet_8073cbf4-baf7-4552-9371-469f0c068b73" xlink:href="scsc-20210930.xsd#scsc_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_scsc_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet_8073cbf4-baf7-4552-9371-469f0c068b73" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_fd57698c-85b9-40b4-9d39-46940528a38f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_fd57698c-85b9-40b4-9d39-46940528a38f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_8620b802-7a9a-40f3-8c02-7456d6ec0078" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_8620b802-7a9a-40f3-8c02-7456d6ec0078" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_5266a39e-ef6a-441e-b9e2-25dceca6d446" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_5266a39e-ef6a-441e-b9e2-25dceca6d446" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1eef5f3-15dc-4fc6-8f80-ea509bfc03eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_554ae38b-8b59-42f4-8fbe-ec18ad335539" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1eef5f3-15dc-4fc6-8f80-ea509bfc03eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_2971b071-5079-4077-a2b4-53a140a55849" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1eef5f3-15dc-4fc6-8f80-ea509bfc03eb" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_2971b071-5079-4077-a2b4-53a140a55849" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_2971b071-5079-4077-a2b4-53a140a55849_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_2971b071-5079-4077-a2b4-53a140a55849" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_2971b071-5079-4077-a2b4-53a140a55849_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_79b6c54e-e666-41bd-b7a2-3793ba60a468" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_2971b071-5079-4077-a2b4-53a140a55849" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_79b6c54e-e666-41bd-b7a2-3793ba60a468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_86a8f673-4c76-4d07-93cb-07d484dac920" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_79b6c54e-e666-41bd-b7a2-3793ba60a468" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_86a8f673-4c76-4d07-93cb-07d484dac920" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.scansource.com/role/DiscontinuedOperationsSignificantNoncashOperatingItemsDetails" xlink:type="simple" xlink:href="scsc-20210930.xsd#DiscontinuedOperationsSignificantNoncashOperatingItemsDetails"/>
  <link:definitionLink xlink:role="http://www.scansource.com/role/DiscontinuedOperationsSignificantNoncashOperatingItemsDetails" xlink:type="extended" id="i866d9841079543fc9e9ec0e5c6bc7dd3_DiscontinuedOperationsSignificantNoncashOperatingItemsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_9c10a870-1af5-4dde-a186-eadd53d3c636" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification_85c9e423-e5d6-42d3-8da3-1288a63c04e1" xlink:href="scsc-20210930.xsd#scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_9c10a870-1af5-4dde-a186-eadd53d3c636" xlink:to="loc_scsc_DisposalGroupIncludingDiscontinuedOperationLossOnHeldForSaleClassification_85c9e423-e5d6-42d3-8da3-1288a63c04e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpenditureDiscontinuedOperations_53a8cb62-6ad5-419e-a499-1c329f37f53e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalExpenditureDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_9c10a870-1af5-4dde-a186-eadd53d3c636" xlink:to="loc_us-gaap_CapitalExpenditureDiscontinuedOperations_53a8cb62-6ad5-419e-a499-1c329f37f53e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_a6e2c1dc-4aed-4982-9e95-d07d5db356e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_9c10a870-1af5-4dde-a186-eadd53d3c636" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_a6e2c1dc-4aed-4982-9e95-d07d5db356e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_d1f93c43-45a9-4dd1-bff8-c16fbcc65a5f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_a6e2c1dc-4aed-4982-9e95-d07d5db356e6" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_d1f93c43-45a9-4dd1-bff8-c16fbcc65a5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_d1f93c43-45a9-4dd1-bff8-c16fbcc65a5f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_d1f93c43-45a9-4dd1-bff8-c16fbcc65a5f" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_d1f93c43-45a9-4dd1-bff8-c16fbcc65a5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_072f4a7b-96ad-41bd-aca5-e677767e4bba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_d1f93c43-45a9-4dd1-bff8-c16fbcc65a5f" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_072f4a7b-96ad-41bd-aca5-e677767e4bba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_515b772e-400c-47d0-9bc7-c76fff76667d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_072f4a7b-96ad-41bd-aca5-e677767e4bba" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_515b772e-400c-47d0-9bc7-c76fff76667d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
