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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:00bd4ea9-b55e-4211-a669-19b7fc8d50fc,g:fe23032f-1b34-4d76-94d1-6ee997d5fb55-->
<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" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="tls-20240930.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_193756b1-16b8-47d5-bc66-b6dc6d31cd46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_113550c6-7c33-4a42-a9dd-95d02cc0e080" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_193756b1-16b8-47d5-bc66-b6dc6d31cd46" xlink:to="loc_us-gaap_GrossProfit_113550c6-7c33-4a42-a9dd-95d02cc0e080" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_afa4d83d-271a-47af-a3ec-163e550899b7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_193756b1-16b8-47d5-bc66-b6dc6d31cd46" xlink:to="loc_us-gaap_OperatingExpenses_afa4d83d-271a-47af-a3ec-163e550899b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_7d211b28-ed52-4b3d-b956-bc4934474487" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_5f6c685f-f314-4a96-ba4d-3e3760515855" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_7d211b28-ed52-4b3d-b956-bc4934474487" xlink:to="loc_us-gaap_OperatingIncomeLoss_5f6c685f-f314-4a96-ba4d-3e3760515855" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_55b0646e-3628-47d1-96f8-35334920b29e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_7d211b28-ed52-4b3d-b956-bc4934474487" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_55b0646e-3628-47d1-96f8-35334920b29e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_cab476fc-8864-4cc6-ae59-0a161e8b1819" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_7d211b28-ed52-4b3d-b956-bc4934474487" xlink:to="loc_us-gaap_InterestExpenseNonoperating_cab476fc-8864-4cc6-ae59-0a161e8b1819" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_3b11cc5b-b9f4-4670-a087-6e92e5ddfe3a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:loc xlink:type="locator" xlink:label="loc_tls_CostOfGoodsAndServiceExcludingImpairmentsDepreciationDepletionAndAmortization_4eac0497-8c56-43e5-a15b-f3851bc35552" xlink:href="tls-20240930.xsd#tls_CostOfGoodsAndServiceExcludingImpairmentsDepreciationDepletionAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_3b11cc5b-b9f4-4670-a087-6e92e5ddfe3a" xlink:to="loc_tls_CostOfGoodsAndServiceExcludingImpairmentsDepreciationDepletionAndAmortization_4eac0497-8c56-43e5-a15b-f3851bc35552" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductionRelatedImpairmentsOrCharges_d88213ef-1d25-49f7-bfe2-c6358a569244" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProductionRelatedImpairmentsOrCharges"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_3b11cc5b-b9f4-4670-a087-6e92e5ddfe3a" xlink:to="loc_us-gaap_ProductionRelatedImpairmentsOrCharges_d88213ef-1d25-49f7-bfe2-c6358a569244" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_9253c56b-9815-40da-b82f-6e01e8f1252a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_3b11cc5b-b9f4-4670-a087-6e92e5ddfe3a" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_9253c56b-9815-40da-b82f-6e01e8f1252a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_dd341c3b-281e-4024-9fa1-c1366772136f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_dc214469-36fd-4b00-b54f-7b079393aa1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_dd341c3b-281e-4024-9fa1-c1366772136f" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_dc214469-36fd-4b00-b54f-7b079393aa1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_f83df07b-c55d-4b0e-b30f-871377cd6504" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_dd341c3b-281e-4024-9fa1-c1366772136f" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_f83df07b-c55d-4b0e-b30f-871377cd6504" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_0eb2dad8-9986-4e03-9beb-d2729df69a87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_dd341c3b-281e-4024-9fa1-c1366772136f" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_0eb2dad8-9986-4e03-9beb-d2729df69a87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c2222c58-ba3e-4531-b20a-4311a039c761" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_cea9fdda-7852-4a17-8a60-1151f15533ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c2222c58-ba3e-4531-b20a-4311a039c761" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_cea9fdda-7852-4a17-8a60-1151f15533ad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_c843fe7d-379b-4c13-9c99-c7ef1c8fdf5c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c2222c58-ba3e-4531-b20a-4311a039c761" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_c843fe7d-379b-4c13-9c99-c7ef1c8fdf5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_9252b569-9223-4e55-ad22-e17823ce4261" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_dcab03bd-def5-4a2c-a0b2-354b3d804e3c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_9252b569-9223-4e55-ad22-e17823ce4261" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_dcab03bd-def5-4a2c-a0b2-354b3d804e3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3f058e5c-18ce-4078-b099-f316ed737401" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_9252b569-9223-4e55-ad22-e17823ce4261" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3f058e5c-18ce-4078-b099-f316ed737401" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS" xlink:type="simple" xlink:href="tls-20240930.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_3e7274fd-1288-48fb-b7ca-d1ad8f55cd2b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_a6e0cdcd-65d1-4910-8b13-eb12477e0e06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_3e7274fd-1288-48fb-b7ca-d1ad8f55cd2b" xlink:to="loc_us-gaap_NetIncomeLoss_a6e0cdcd-65d1-4910-8b13-eb12477e0e06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_fe88bcaa-86f9-4d9a-b692-f473927c0564" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_3e7274fd-1288-48fb-b7ca-d1ad8f55cd2b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_fe88bcaa-86f9-4d9a-b692-f473927c0564" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_26e235d0-bf12-45f7-9d07-2de8ef77b729" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_b84528e3-5c58-494b-8a4d-1daca5993d33" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_26e235d0-bf12-45f7-9d07-2de8ef77b729" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_b84528e3-5c58-494b-8a4d-1daca5993d33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_624fca70-ac9c-456c-90a7-9a23c8f08231" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_26e235d0-bf12-45f7-9d07-2de8ef77b729" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_624fca70-ac9c-456c-90a7-9a23c8f08231" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="tls-20240930.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_f7efccf9-e09b-4c8a-92a2-9ca36df5379b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_7e06d5c9-e1c1-4b33-bedd-0835099d880a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f7efccf9-e09b-4c8a-92a2-9ca36df5379b" xlink:to="loc_us-gaap_LiabilitiesCurrent_7e06d5c9-e1c1-4b33-bedd-0835099d880a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_20eda732-1578-45ec-8ffc-0314802e8785" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f7efccf9-e09b-4c8a-92a2-9ca36df5379b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_20eda732-1578-45ec-8ffc-0314802e8785" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a3546a5c-912e-455e-b98a-d253a3659963" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f7efccf9-e09b-4c8a-92a2-9ca36df5379b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a3546a5c-912e-455e-b98a-d253a3659963" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_cf653aef-073a-4ab7-a142-47e03fb36c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f7efccf9-e09b-4c8a-92a2-9ca36df5379b" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_cf653aef-073a-4ab7-a142-47e03fb36c3e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_8dfd76c9-5ec1-4654-8ac7-8f805d3b1036" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f7efccf9-e09b-4c8a-92a2-9ca36df5379b" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_8dfd76c9-5ec1-4654-8ac7-8f805d3b1036" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_881e3898-0b0c-4fa3-922c-d1f741f5cb85" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_881e3898-0b0c-4fa3-922c-d1f741f5cb85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrent_f42aabb9-f698-454a-aba8-f68ceb09c13a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredCompensationLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrent_f42aabb9-f698-454a-aba8-f68ceb09c13a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_5d4a4727-7c77-41a2-8628-6f6ee7fb53fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_5d4a4727-7c77-41a2-8628-6f6ee7fb53fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_3617b71e-f1a2-4db3-a2ba-818de5c6d530" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_3617b71e-f1a2-4db3-a2ba-818de5c6d530" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_61d5a255-62ad-428e-8468-05db4a3397cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_61d5a255-62ad-428e-8468-05db4a3397cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_5666c220-52a8-4944-81f1-db351335d0d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_d2cf30dd-d991-4586-ab65-41911c471b26" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_5666c220-52a8-4944-81f1-db351335d0d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_27a40216-54a2-4a5d-b7b8-ac32d2bb36f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_AssetsCurrent_27a40216-54a2-4a5d-b7b8-ac32d2bb36f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_91538873-3895-4f65-b1ee-9999fec29735" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_91538873-3895-4f65-b1ee-9999fec29735" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_434c0d60-0a80-498e-8320-ca225b37c65e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_434c0d60-0a80-498e-8320-ca225b37c65e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_afb7b8f5-f29f-4e63-a95a-aa6b2185966e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_afb7b8f5-f29f-4e63-a95a-aa6b2185966e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_6596505d-5f62-42f7-a7ef-1f306e1569ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_Goodwill_6596505d-5f62-42f7-a7ef-1f306e1569ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_b1613e7b-60c8-4486-a2aa-3f2e7b57b137" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_b1613e7b-60c8-4486-a2aa-3f2e7b57b137" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_5d56479b-3427-4e30-a3ac-44e91310f75c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c52526e1-f88e-4bb3-ba9d-9fec9aa3bfe8" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_5d56479b-3427-4e30-a3ac-44e91310f75c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_c62eda05-81ac-4981-a5d5-8adff325c701" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_8cc26c14-2da2-4223-a944-772274b17402" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c62eda05-81ac-4981-a5d5-8adff325c701" xlink:to="loc_us-gaap_CommitmentsAndContingencies_8cc26c14-2da2-4223-a944-772274b17402" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_76f117f9-6f54-4107-bd0e-2ec886954f8d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c62eda05-81ac-4981-a5d5-8adff325c701" xlink:to="loc_us-gaap_Liabilities_76f117f9-6f54-4107-bd0e-2ec886954f8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_954ddd67-9184-439a-adac-b016b3aec49c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c62eda05-81ac-4981-a5d5-8adff325c701" xlink:to="loc_us-gaap_StockholdersEquity_954ddd67-9184-439a-adac-b016b3aec49c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_96921d95-3157-4628-8afc-926c245d9360" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_1694ead6-bd0d-4d37-9e63-9acabf74b0d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_96921d95-3157-4628-8afc-926c245d9360" xlink:to="loc_us-gaap_CommonStockValue_1694ead6-bd0d-4d37-9e63-9acabf74b0d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_531845f5-5e9f-48e4-9c17-10b8b4f500e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_96921d95-3157-4628-8afc-926c245d9360" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_531845f5-5e9f-48e4-9c17-10b8b4f500e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_e528e44e-5922-4386-b005-c5849d4007f8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_96921d95-3157-4628-8afc-926c245d9360" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_e528e44e-5922-4386-b005-c5849d4007f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_96b0c2a2-5807-4596-9c71-22568751f52b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_96921d95-3157-4628-8afc-926c245d9360" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_96b0c2a2-5807-4596-9c71-22568751f52b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_0519f13a-a7ec-4122-926a-73e6d551e655" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3e012ba3-55ec-4312-ab56-722c81191050" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0519f13a-a7ec-4122-926a-73e6d551e655" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3e012ba3-55ec-4312-ab56-722c81191050" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_b0305f3d-9bb9-4470-b72c-0c9bfdf8c35f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0519f13a-a7ec-4122-926a-73e6d551e655" xlink:to="loc_us-gaap_ReceivablesNetCurrent_b0305f3d-9bb9-4470-b72c-0c9bfdf8c35f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_f9a8e69f-ef5f-4707-8665-5f451d6736ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0519f13a-a7ec-4122-926a-73e6d551e655" xlink:to="loc_us-gaap_InventoryNet_f9a8e69f-ef5f-4707-8665-5f451d6736ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_a0d498e0-9612-43ef-abed-41e336418537" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrepaidExpenseCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0519f13a-a7ec-4122-926a-73e6d551e655" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_a0d498e0-9612-43ef-abed-41e336418537" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_741e829a-1483-4ad3-81b2-f6088d5cd4bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0519f13a-a7ec-4122-926a-73e6d551e655" xlink:to="loc_us-gaap_OtherAssetsCurrent_741e829a-1483-4ad3-81b2-f6088d5cd4bb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="tls-20240930.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_c47b4e1b-c8f6-4a27-9eea-334661aece31" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_c47b4e1b-c8f6-4a27-9eea-334661aece31" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_42ea6307-b970-4a32-8a23-63c95bbcb588" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_42ea6307-b970-4a32-8a23-63c95bbcb588" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_cec86915-6c2c-4c2e-b6bc-75e1d54591ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_cec86915-6c2c-4c2e-b6bc-75e1d54591ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_0f634e95-f6dc-457b-a372-f9c9cb07aad6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_0f634e95-f6dc-457b-a372-f9c9cb07aad6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_tls_PaymentOfDFTHoldbackAmount_8098c11c-9c16-4a8c-81e9-14a29bacf7dc" xlink:href="tls-20240930.xsd#tls_PaymentOfDFTHoldbackAmount"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:to="loc_tls_PaymentOfDFTHoldbackAmount_8098c11c-9c16-4a8c-81e9-14a29bacf7dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_49643d8e-6c46-4b98-a5bf-f990784fec88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_73f958f4-e960-4192-b997-9fe80f8c0342" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_49643d8e-6c46-4b98-a5bf-f990784fec88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d7b14177-dd3e-4328-bdb1-d248b621e941" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToDevelopSoftware_0e7a197d-3435-4112-85a3-8c60e4b2dd8b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToDevelopSoftware"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d7b14177-dd3e-4328-bdb1-d248b621e941" xlink:to="loc_us-gaap_PaymentsToDevelopSoftware_0e7a197d-3435-4112-85a3-8c60e4b2dd8b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7e0e24b5-8f90-42d5-95bc-cf2af051f2fa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d7b14177-dd3e-4328-bdb1-d248b621e941" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7e0e24b5-8f90-42d5-95bc-cf2af051f2fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_d2a01db2-1c65-4bab-afa4-bb8700f5a4ec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireInvestments"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d7b14177-dd3e-4328-bdb1-d248b621e941" xlink:to="loc_us-gaap_PaymentsToAcquireInvestments_d2a01db2-1c65-4bab-afa4-bb8700f5a4ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_0659ebc9-bdfa-470d-8077-48638b7c939f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_NetIncomeLoss_0659ebc9-bdfa-470d-8077-48638b7c939f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_2ee15a18-0a81-40eb-80a2-76a50f94fd9c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_ShareBasedCompensation_2ee15a18-0a81-40eb-80a2-76a50f94fd9c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_2d679b57-1c82-4d75-83a6-731bc1f4ceba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_2d679b57-1c82-4d75-83a6-731bc1f4ceba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_469a9f47-3b7f-4174-9cd4-b88c37ef3f36" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_469a9f47-3b7f-4174-9cd4-b88c37ef3f36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionExpense_2b89413b-bd71-4b1f-9110-5da8e8036f3f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccretionExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_AccretionExpense_2b89413b-bd71-4b1f-9110-5da8e8036f3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_cf07704f-5a2b-4ef6-a9f1-4368632889fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_cf07704f-5a2b-4ef6-a9f1-4368632889fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_544015c3-5f7b-47af-b664-ac8562e2268d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_544015c3-5f7b-47af-b664-ac8562e2268d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_5610d918-ee08-4789-94a0-fbfcf3d0a92a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_5610d918-ee08-4789-94a0-fbfcf3d0a92a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_67190d20-071d-4e15-94d2-f367de373cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_67190d20-071d-4e15-94d2-f367de373cdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_8668eddb-c9b4-488c-940b-2b668da94412" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_8668eddb-c9b4-488c-940b-2b668da94412" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_de0202a4-ad6c-4200-aec4-7a8f5aa40e3b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_de0202a4-ad6c-4200-aec4-7a8f5aa40e3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_21c702e0-d9e8-447b-a267-a696ba91858a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_21c702e0-d9e8-447b-a267-a696ba91858a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_f634171d-bd30-4959-affa-590793361b44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_f634171d-bd30-4959-affa-590793361b44" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_6f3ec8fe-428d-4a61-9075-8ff372747831" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_6f3ec8fe-428d-4a61-9075-8ff372747831" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_3f559ae4-af39-4d5b-b95b-36775ae41d21" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_3f559ae4-af39-4d5b-b95b-36775ae41d21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_4d69fce9-19fb-44f6-b89d-2b83fd7a434d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_4d69fce9-19fb-44f6-b89d-2b83fd7a434d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_3a53aed7-29eb-4d5c-a8df-a5b54301d6cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_65235237-a08e-476f-8444-ab48d2e994d8" xlink:to="loc_us-gaap_AssetImpairmentCharges_3a53aed7-29eb-4d5c-a8df-a5b54301d6cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_badc2a9c-4bb0-4491-a28e-c8e6b14656cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1e6aca68-6282-4cc9-97ac-0bccb23db3d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_badc2a9c-4bb0-4491-a28e-c8e6b14656cd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1e6aca68-6282-4cc9-97ac-0bccb23db3d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_3ab8cf35-e1cf-4776-a47e-6340096c5e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_badc2a9c-4bb0-4491-a28e-c8e6b14656cd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_3ab8cf35-e1cf-4776-a47e-6340096c5e6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_071e989a-b5ba-42e7-b4db-540e39e7b2e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_badc2a9c-4bb0-4491-a28e-c8e6b14656cd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_071e989a-b5ba-42e7-b4db-540e39e7b2e0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/SIGNIFICANTACCOUNTINGPOLICIESRestructuringExpensesandImpairmentLossDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#SIGNIFICANTACCOUNTINGPOLICIESRestructuringExpensesandImpairmentLossDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/SIGNIFICANTACCOUNTINGPOLICIESRestructuringExpensesandImpairmentLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_23b1c5b8-f914-4c93-b9f4-918d7c1c657a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringSettlementAndImpairmentProvisions"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_1db23d01-c78a-4a2c-93e2-7c35c0e3688d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_23b1c5b8-f914-4c93-b9f4-918d7c1c657a" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_1db23d01-c78a-4a2c-93e2-7c35c0e3688d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_56e16428-c660-4d1a-83cb-5e286c59d2fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_23b1c5b8-f914-4c93-b9f4-918d7c1c657a" xlink:to="loc_us-gaap_RestructuringCharges_56e16428-c660-4d1a-83cb-5e286c59d2fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_817cb73b-1bec-4b35-903d-40ec0371f88e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_be4f6915-7347-4d08-b638-c65bcd71ff05" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeveranceCosts1"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RestructuringCharges_817cb73b-1bec-4b35-903d-40ec0371f88e" xlink:to="loc_us-gaap_SeveranceCosts1_be4f6915-7347-4d08-b638-c65bcd71ff05" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringCosts_073b86d6-f943-4b9e-a1bd-7ee5317df736" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherRestructuringCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RestructuringCharges_817cb73b-1bec-4b35-903d-40ec0371f88e" xlink:to="loc_us-gaap_OtherRestructuringCosts_073b86d6-f943-4b9e-a1bd-7ee5317df736" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/ACCOUNTSRECEIVABLENETScheduleofAccountsNotesLoansandFinancingReceivableDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#ACCOUNTSRECEIVABLENETScheduleofAccountsNotesLoansandFinancingReceivableDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/ACCOUNTSRECEIVABLENETScheduleofAccountsNotesLoansandFinancingReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_90e43df7-dece-45e8-a890-f53521133adf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BilledContractReceivables_6dd5f109-3564-4fba-9a0d-adee0f2dfa99" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BilledContractReceivables"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_90e43df7-dece-45e8-a890-f53521133adf" xlink:to="loc_us-gaap_BilledContractReceivables_6dd5f109-3564-4fba-9a0d-adee0f2dfa99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledContractsReceivable_f9ab3343-74f3-4831-87a3-c547ef05e2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnbilledContractsReceivable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_90e43df7-dece-45e8-a890-f53521133adf" xlink:to="loc_us-gaap_UnbilledContractsReceivable_f9ab3343-74f3-4831-87a3-c547ef05e2dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_07d9d6b8-40d1-431f-b450-d0282c3900e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_90e43df7-dece-45e8-a890-f53521133adf" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_07d9d6b8-40d1-431f-b450-d0282c3900e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_d0f7e74a-698b-4cd8-aaa8-d728817d908d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerAssetGrossCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_90e43df7-dece-45e8-a890-f53521133adf" xlink:to="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_d0f7e74a-698b-4cd8-aaa8-d728817d908d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INVENTORIESNETDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#INVENTORIESNETDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/INVENTORIESNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_a2309598-c184-45ac-bcd9-ad17f20b4aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryGross_1bdeb7e1-09b4-45a1-aace-ce8c0d68f23c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_a2309598-c184-45ac-bcd9-ad17f20b4aa7" xlink:to="loc_us-gaap_InventoryGross_1bdeb7e1-09b4-45a1-aace-ce8c0d68f23c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryValuationReserves_4644ea35-7e70-448a-a7ae-2ad7d7549d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryValuationReserves"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_a2309598-c184-45ac-bcd9-ad17f20b4aa7" xlink:to="loc_us-gaap_InventoryValuationReserves_4644ea35-7e70-448a-a7ae-2ad7d7549d9f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/PROPERTYANDEQUIPMENTNETDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#PROPERTYANDEQUIPMENTNETDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/PROPERTYANDEQUIPMENTNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_5940e982-2b1f-4a25-90a9-c4ceba18a41e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_a0beaa6d-f387-434e-9490-f55685b94f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_5940e982-2b1f-4a25-90a9-c4ceba18a41e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_a0beaa6d-f387-434e-9490-f55685b94f9a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_abc6bdbf-d0a6-4675-aafb-4d904b6694f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_5940e982-2b1f-4a25-90a9-c4ceba18a41e" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_abc6bdbf-d0a6-4675-aafb-4d904b6694f2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8f9d5d8c-4afc-41e2-8685-adeb6f89ca1c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_733de021-7d76-46b7-b71a-e9016cebb599" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8f9d5d8c-4afc-41e2-8685-adeb6f89ca1c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_733de021-7d76-46b7-b71a-e9016cebb599" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_93345adc-c314-4b38-8e28-60f72e3999a8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8f9d5d8c-4afc-41e2-8685-adeb6f89ca1c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_93345adc-c314-4b38-8e28-60f72e3999a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_83ee470b-5f6e-4bc8-b11a-48272e91d3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_8dc62729-1c30-4894-9e6d-871e5194c50d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_83ee470b-5f6e-4bc8-b11a-48272e91d3e7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_8dc62729-1c30-4894-9e6d-871e5194c50d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_08fb2183-fea0-4bf2-a46c-2ca69eaa203d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_83ee470b-5f6e-4bc8-b11a-48272e91d3e7" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_08fb2183-fea0-4bf2-a46c-2ca69eaa203d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_09ac5c46-ed53-4f0e-a1de-838944367269" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_da462332-d7cc-435f-870b-a445ac7f6be4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_09ac5c46-ed53-4f0e-a1de-838944367269" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_da462332-d7cc-435f-870b-a445ac7f6be4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_972954f5-921b-4d81-969c-533a87692bee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_09ac5c46-ed53-4f0e-a1de-838944367269" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_972954f5-921b-4d81-969c-533a87692bee" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails_1" xlink:type="simple" xlink:href="tls-20240930.xsd#INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails_1"/>
  <link:calculationLink xlink:role="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_dbeb017b-670d-4e1e-a155-1e2cc9c4ebaa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bd6d1218-9652-4dd2-8450-ba78ab99927c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_dbeb017b-670d-4e1e-a155-1e2cc9c4ebaa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bd6d1218-9652-4dd2-8450-ba78ab99927c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_411d0b30-6700-4573-b936-a37cd5fa15fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_dbeb017b-670d-4e1e-a155-1e2cc9c4ebaa" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_411d0b30-6700-4573-b936-a37cd5fa15fb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INTANGIBLEASSETSNETAmortizationExpenseDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#INTANGIBLEASSETSNETAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/INTANGIBLEASSETSNETAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_tls_IntangibleAssetsAmortizationExpense_fac92992-dc22-4b0f-ba7f-834b3cc46706" xlink:href="tls-20240930.xsd#tls_IntangibleAssetsAmortizationExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_f524cb7a-25b2-4d15-99db-1b10472ed197" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_tls_IntangibleAssetsAmortizationExpense_fac92992-dc22-4b0f-ba7f-834b3cc46706" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_f524cb7a-25b2-4d15-99db-1b10472ed197" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_2c408ee9-3030-4777-9213-e2e41fb27c4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSoldAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_tls_IntangibleAssetsAmortizationExpense_fac92992-dc22-4b0f-ba7f-834b3cc46706" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_2c408ee9-3030-4777-9213-e2e41fb27c4a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSOtherAssetsDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#OTHERBALANCESHEETCOMPONENTSOtherAssetsDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSOtherAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_ccd2dea1-778b-43a4-8973-ff37ab24a631" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_b18dfda3-425d-4c3b-bf4e-a0aba0c077c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_ccd2dea1-778b-43a4-8973-ff37ab24a631" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_b18dfda3-425d-4c3b-bf4e-a0aba0c077c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_8cc8c4fc-fef4-43cf-98f0-608ac8f2bc9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_ccd2dea1-778b-43a4-8973-ff37ab24a631" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_8cc8c4fc-fef4-43cf-98f0-608ac8f2bc9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_94f89a99-18f1-47ae-bc52-38da9a662791" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Investments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_ccd2dea1-778b-43a4-8973-ff37ab24a631" xlink:to="loc_us-gaap_Investments_94f89a99-18f1-47ae-bc52-38da9a662791" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSAccountsPayableandOtherAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#OTHERBALANCESHEETCOMPONENTSAccountsPayableandOtherAccruedLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSAccountsPayableandOtherAccruedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_bab081af-845b-4f47-8911-b9ad18d8954b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_31f97235-c414-4030-83d5-19363fa3d11b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_bab081af-845b-4f47-8911-b9ad18d8954b" xlink:to="loc_us-gaap_AccountsPayableCurrent_31f97235-c414-4030-83d5-19363fa3d11b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_d026e4fb-d88b-4d7b-8682-540be15cfb54" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_bab081af-845b-4f47-8911-b9ad18d8954b" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_d026e4fb-d88b-4d7b-8682-540be15cfb54" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSOtherCurrentLiabilitiesDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#OTHERBALANCESHEETCOMPONENTSOtherCurrentLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSOtherCurrentLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_eb806fe0-c49a-41b0-8674-08af1a4da3ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_tls_OtherAccruedExpensesCurrent_e135ee68-516c-4852-a572-8086194411ee" xlink:href="tls-20240930.xsd#tls_OtherAccruedExpensesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_eb806fe0-c49a-41b0-8674-08af1a4da3ba" xlink:to="loc_tls_OtherAccruedExpensesCurrent_e135ee68-516c-4852-a572-8086194411ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_tls_OtherCurrentLiabilitiesOther_7fb6734f-3c79-4e11-a45d-e5e5fd38d4c9" xlink:href="tls-20240930.xsd#tls_OtherCurrentLiabilitiesOther"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_eb806fe0-c49a-41b0-8674-08af1a4da3ba" xlink:to="loc_tls_OtherCurrentLiabilitiesOther_7fb6734f-3c79-4e11-a45d-e5e5fd38d4c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_3e2084f1-94a5-4eae-82be-e310b8cae153" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_eb806fe0-c49a-41b0-8674-08af1a4da3ba" xlink:to="loc_us-gaap_RestructuringReserveCurrent_3e2084f1-94a5-4eae-82be-e310b8cae153" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/SUPPLEMENTALCASHFLOWINFORMATIONCashCashEquivalentsandRestrictedCashDetails" xlink:type="simple" xlink:href="tls-20240930.xsd#SUPPLEMENTALCASHFLOWINFORMATIONCashCashEquivalentsandRestrictedCashDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/SUPPLEMENTALCASHFLOWINFORMATIONCashCashEquivalentsandRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9ba1401a-edf2-4239-95bb-70af42a4ac8d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_a0e44907-c335-4ab3-848e-edf5539b2732" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9ba1401a-edf2-4239-95bb-70af42a4ac8d" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_a0e44907-c335-4ab3-848e-edf5539b2732" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_c273e6f7-b02e-410b-869b-dd305c063de5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9ba1401a-edf2-4239-95bb-70af42a4ac8d" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_c273e6f7-b02e-410b-869b-dd305c063de5" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
