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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:2612ea41-e5c8-43c2-9a32-6b40e7eb447f,g:113c0ba5-5106-48be-9cef-bc4a5f851503-->
<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-20240630.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_6ebaf49b-9289-4e10-8785-ba1d0a4711aa" 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_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_1e0eb114-d024-4c50-8890-dadeefdf7ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_6ebaf49b-9289-4e10-8785-ba1d0a4711aa" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_1e0eb114-d024-4c50-8890-dadeefdf7ee7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_7584d4af-0c48-4ae7-b0b3-a1186f1962c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_6ebaf49b-9289-4e10-8785-ba1d0a4711aa" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_7584d4af-0c48-4ae7-b0b3-a1186f1962c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bae6216f-d703-4edc-b85c-45e280f5e506" 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_e3e43e3c-a5c9-40f5-beea-f916ab59b51f" 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_bae6216f-d703-4edc-b85c-45e280f5e506" xlink:to="loc_us-gaap_OperatingIncomeLoss_e3e43e3c-a5c9-40f5-beea-f916ab59b51f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_66a0ee34-7d68-4460-abe3-de72da0874da" 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_bae6216f-d703-4edc-b85c-45e280f5e506" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_66a0ee34-7d68-4460-abe3-de72da0874da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_c98731d0-6730-4537-af8c-840125cf5c92" 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_bae6216f-d703-4edc-b85c-45e280f5e506" xlink:to="loc_us-gaap_InterestExpenseNonoperating_c98731d0-6730-4537-af8c-840125cf5c92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_9706c15f-0255-4969-983a-65079fdf4bac" 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_3ef322e4-00e1-41e6-aea6-37f075f5c46e" 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_9706c15f-0255-4969-983a-65079fdf4bac" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_3ef322e4-00e1-41e6-aea6-37f075f5c46e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_15121521-7884-466c-a7c0-2872e829ded6" 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_9706c15f-0255-4969-983a-65079fdf4bac" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_15121521-7884-466c-a7c0-2872e829ded6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_94fd5804-c728-40c4-8b65-765816f9b821" 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_030c2d1a-59a8-4abe-a655-b44652b94c85" 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_94fd5804-c728-40c4-8b65-765816f9b821" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_030c2d1a-59a8-4abe-a655-b44652b94c85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_1a5ca367-5c9d-4732-bf4e-e4fae770360d" 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_94fd5804-c728-40c4-8b65-765816f9b821" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_1a5ca367-5c9d-4732-bf4e-e4fae770360d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_ff0a2e69-5221-4769-8f3a-0b6d9c5a07c5" 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_GeneralAndAdministrativeExpense_13b16d15-154b-4d22-8639-e45b7ec008bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ff0a2e69-5221-4769-8f3a-0b6d9c5a07c5" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_13b16d15-154b-4d22-8639-e45b7ec008bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_4532c427-ff03-4d97-b84e-582c3af1e535" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ff0a2e69-5221-4769-8f3a-0b6d9c5a07c5" xlink:to="loc_us-gaap_GrossProfit_4532c427-ff03-4d97-b84e-582c3af1e535" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_2800de47-0da0-434f-8f4c-fb7f7377a40d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ff0a2e69-5221-4769-8f3a-0b6d9c5a07c5" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_2800de47-0da0-434f-8f4c-fb7f7377a40d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS" xlink:type="simple" xlink:href="tls-20240630.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_73784af3-ad2e-4b48-92d0-4316029f5ab9" 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_7a1c3cf1-5cbc-415d-9bc4-024c25049eb2" 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_73784af3-ad2e-4b48-92d0-4316029f5ab9" xlink:to="loc_us-gaap_NetIncomeLoss_7a1c3cf1-5cbc-415d-9bc4-024c25049eb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e797538a-f45d-4c46-ae38-38593971fb1f" 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_73784af3-ad2e-4b48-92d0-4316029f5ab9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e797538a-f45d-4c46-ae38-38593971fb1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f5510e4f-d529-4c2d-8fa8-1b3b0353db7b" 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_a3bc10d9-af90-40ef-a8d3-3d1bc9e99454" 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_f5510e4f-d529-4c2d-8fa8-1b3b0353db7b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_a3bc10d9-af90-40ef-a8d3-3d1bc9e99454" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_82e9e235-46f3-4216-90f2-6a5753d6de61" 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_f5510e4f-d529-4c2d-8fa8-1b3b0353db7b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_82e9e235-46f3-4216-90f2-6a5753d6de61" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="tls-20240630.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" 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_9a75d4e0-39fe-4ea3-ad7a-06d9d4eb7b8b" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_AssetsCurrent_9a75d4e0-39fe-4ea3-ad7a-06d9d4eb7b8b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_79fe76fd-8922-4214-a9af-c22cad9d3dd5" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_79fe76fd-8922-4214-a9af-c22cad9d3dd5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_641199fd-025c-4d4c-9624-a8d246008e62" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_641199fd-025c-4d4c-9624-a8d246008e62" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_66c1c154-cfa8-426a-87bf-15d5829b5e8a" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_66c1c154-cfa8-426a-87bf-15d5829b5e8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_30675026-88b5-4fc1-8023-9139f127b5b5" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_Goodwill_30675026-88b5-4fc1-8023-9139f127b5b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_dd640ee8-d1b0-473b-a2c7-7d5a2baddce8" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_dd640ee8-d1b0-473b-a2c7-7d5a2baddce8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_6720e4dc-3d68-4157-be81-4e62201b4bef" 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_394ce89d-2f44-49ca-87a6-4bd87b3a8b76" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_6720e4dc-3d68-4157-be81-4e62201b4bef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_96570613-f94b-46c3-8272-a4308ba328de" 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_125a683c-58c4-4157-a068-b63cfa07abe2" 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_96570613-f94b-46c3-8272-a4308ba328de" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_125a683c-58c4-4157-a068-b63cfa07abe2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrent_e824c92a-3157-47b6-b560-27cb52584cc4" 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_96570613-f94b-46c3-8272-a4308ba328de" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrent_e824c92a-3157-47b6-b560-27cb52584cc4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_de1ab3c9-7080-45c8-8b76-f0cb2fbe6830" 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_96570613-f94b-46c3-8272-a4308ba328de" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_de1ab3c9-7080-45c8-8b76-f0cb2fbe6830" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_eda1d2a1-b66a-4c62-8569-be015ffd23a5" 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_96570613-f94b-46c3-8272-a4308ba328de" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_eda1d2a1-b66a-4c62-8569-be015ffd23a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_0922f0a9-efe0-4f51-9d11-dec1df73c975" 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_96570613-f94b-46c3-8272-a4308ba328de" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_0922f0a9-efe0-4f51-9d11-dec1df73c975" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_bb020cca-b452-4629-ab9c-4176cdd0483d" 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_96570613-f94b-46c3-8272-a4308ba328de" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_bb020cca-b452-4629-ab9c-4176cdd0483d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_eaae439f-8888-400c-b4f9-154faabe2db1" 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_996e4682-c367-43f5-9e9b-24ef666bdcb0" 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_eaae439f-8888-400c-b4f9-154faabe2db1" xlink:to="loc_us-gaap_CommonStockValue_996e4682-c367-43f5-9e9b-24ef666bdcb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_d1030160-434f-4d68-83fb-77f7dc1e8b47" 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_eaae439f-8888-400c-b4f9-154faabe2db1" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_d1030160-434f-4d68-83fb-77f7dc1e8b47" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6dcef54e-41f0-4470-9e74-634749c125f6" 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_eaae439f-8888-400c-b4f9-154faabe2db1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6dcef54e-41f0-4470-9e74-634749c125f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_b27228ae-07c5-40ba-9675-8e96a03601f4" 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_eaae439f-8888-400c-b4f9-154faabe2db1" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_b27228ae-07c5-40ba-9675-8e96a03601f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_709ae285-4cc4-4796-8d7f-4a6a9c560d62" 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_dc61e211-6974-4d40-9340-e057ecdf68ff" 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_709ae285-4cc4-4796-8d7f-4a6a9c560d62" xlink:to="loc_us-gaap_CommitmentsAndContingencies_dc61e211-6974-4d40-9340-e057ecdf68ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_8c8f56a4-345a-43b5-a7f9-5a9802e93dde" 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_709ae285-4cc4-4796-8d7f-4a6a9c560d62" xlink:to="loc_us-gaap_Liabilities_8c8f56a4-345a-43b5-a7f9-5a9802e93dde" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_5dbb3598-f849-4776-bea1-714ff543297f" 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_709ae285-4cc4-4796-8d7f-4a6a9c560d62" xlink:to="loc_us-gaap_StockholdersEquity_5dbb3598-f849-4776-bea1-714ff543297f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_61c1a0a7-006a-4763-84b7-861f70fc089a" 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_02a3c6b0-47a0-42db-9526-afab64b9e599" 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_61c1a0a7-006a-4763-84b7-861f70fc089a" xlink:to="loc_us-gaap_LiabilitiesCurrent_02a3c6b0-47a0-42db-9526-afab64b9e599" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_87e40e3c-6169-4c4b-bdf7-d6e905531c4b" 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_61c1a0a7-006a-4763-84b7-861f70fc089a" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_87e40e3c-6169-4c4b-bdf7-d6e905531c4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d84a48de-4841-4d49-84af-0f0d66913652" 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_61c1a0a7-006a-4763-84b7-861f70fc089a" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d84a48de-4841-4d49-84af-0f0d66913652" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_6b8aa7cc-f388-4f64-a366-c9708916b851" 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_61c1a0a7-006a-4763-84b7-861f70fc089a" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_6b8aa7cc-f388-4f64-a366-c9708916b851" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_988d9040-bc64-47ef-b666-4af96f3862ed" 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_61c1a0a7-006a-4763-84b7-861f70fc089a" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_988d9040-bc64-47ef-b666-4af96f3862ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_02891d60-4b6e-45c2-b5ba-80263af99164" 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_2b393f89-8ade-41d3-b188-a23ffda6c496" 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_02891d60-4b6e-45c2-b5ba-80263af99164" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2b393f89-8ade-41d3-b188-a23ffda6c496" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_0f65b6e6-86f3-4ff2-b386-e4c1c793ddf9" 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_02891d60-4b6e-45c2-b5ba-80263af99164" xlink:to="loc_us-gaap_ReceivablesNetCurrent_0f65b6e6-86f3-4ff2-b386-e4c1c793ddf9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_99a333b8-e873-49a2-8b14-3319e2cc82bb" 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_02891d60-4b6e-45c2-b5ba-80263af99164" xlink:to="loc_us-gaap_InventoryNet_99a333b8-e873-49a2-8b14-3319e2cc82bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_e24a4867-d92c-41ab-9297-7c9e095d3ea4" 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_02891d60-4b6e-45c2-b5ba-80263af99164" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_e24a4867-d92c-41ab-9297-7c9e095d3ea4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_2bb4b494-394f-4e41-99dc-22848aff225e" 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_02891d60-4b6e-45c2-b5ba-80263af99164" xlink:to="loc_us-gaap_OtherAssetsCurrent_2bb4b494-394f-4e41-99dc-22848aff225e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="tls-20240630.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://telos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_cc33870f-52a6-4cd2-a8ee-ea51dc6c56c4" 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_c2eeceba-01af-4d33-af5b-9dded02028c9" 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_cc33870f-52a6-4cd2-a8ee-ea51dc6c56c4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_c2eeceba-01af-4d33-af5b-9dded02028c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8435ba5a-1ba0-4b15-bc3d-f10ab8ae0573" 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_cc33870f-52a6-4cd2-a8ee-ea51dc6c56c4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8435ba5a-1ba0-4b15-bc3d-f10ab8ae0573" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_388c9061-d34d-4a34-9d30-6822d0c96f75" 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_cc33870f-52a6-4cd2-a8ee-ea51dc6c56c4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_388c9061-d34d-4a34-9d30-6822d0c96f75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" 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_6f69daca-6998-408d-abb9-3f486a7f62f0" 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_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_6f69daca-6998-408d-abb9-3f486a7f62f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_be49a01e-fe83-455d-a9ba-28e85258372b" 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_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_be49a01e-fe83-455d-a9ba-28e85258372b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_549232b5-b0eb-4d06-9977-9b0dd759a65e" 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_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_549232b5-b0eb-4d06-9977-9b0dd759a65e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_87ae8dfb-210e-440f-91f5-4ab2bba9c9ec" 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_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_87ae8dfb-210e-440f-91f5-4ab2bba9c9ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_tls_PaymentOfDFTHoldbackAmount_2a58a41a-4f13-4184-bb98-63ba8f9cf0fd" xlink:href="tls-20240630.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_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" xlink:to="loc_tls_PaymentOfDFTHoldbackAmount_2a58a41a-4f13-4184-bb98-63ba8f9cf0fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_4df51f6a-0c6a-47b9-9be6-8e9c087072db" 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_5947a074-3e9f-456f-8d2b-d9cae3b6b7b6" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_4df51f6a-0c6a-47b9-9be6-8e9c087072db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_c22bb804-3be2-4bee-8237-cb613a79c7ef" 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_a7e7e1db-9708-4709-886b-e295f5545ecb" 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_c22bb804-3be2-4bee-8237-cb613a79c7ef" xlink:to="loc_us-gaap_PaymentsToDevelopSoftware_a7e7e1db-9708-4709-886b-e295f5545ecb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_38f580d3-767d-4e04-ba32-70dde6f93bd5" 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_c22bb804-3be2-4bee-8237-cb613a79c7ef" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_38f580d3-767d-4e04-ba32-70dde6f93bd5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_66059297-7b3a-409c-974b-3e7c3b57421c" 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_c22bb804-3be2-4bee-8237-cb613a79c7ef" xlink:to="loc_us-gaap_PaymentsToAcquireInvestments_66059297-7b3a-409c-974b-3e7c3b57421c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_accc6550-b43c-46c6-8c4d-2a310a6e6f95" 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_2ba37e68-a817-4ab8-a19c-d04e7ceac7f4" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_NetIncomeLoss_2ba37e68-a817-4ab8-a19c-d04e7ceac7f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_5f5e4b65-36ac-47c0-bdc3-160a30b1f813" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_ShareBasedCompensation_5f5e4b65-36ac-47c0-bdc3-160a30b1f813" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_7f60e2ca-df1e-4b0a-8213-7c0f7c104056" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_7f60e2ca-df1e-4b0a-8213-7c0f7c104056" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_9c0baca2-9c3d-4a92-bdc0-f6edc81b6db2" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_9c0baca2-9c3d-4a92-bdc0-f6edc81b6db2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionExpense_409ff04f-7009-420c-8eeb-0dc0ddb1e8e5" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_AccretionExpense_409ff04f-7009-420c-8eeb-0dc0ddb1e8e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_c3c2d0c4-6b8f-465f-95fe-b65aac64879d" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_c3c2d0c4-6b8f-465f-95fe-b65aac64879d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_6c3a6137-4429-4e33-97c9-4b84c69a0319" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_6c3a6137-4429-4e33-97c9-4b84c69a0319" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_f67ef189-9cf3-4988-b8c2-48d6e4e03223" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_f67ef189-9cf3-4988-b8c2-48d6e4e03223" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_ae77aa27-4eed-47d3-814a-8cf775ac005e" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_ae77aa27-4eed-47d3-814a-8cf775ac005e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_14d82c93-d00f-4b97-897d-9657c6117094" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_14d82c93-d00f-4b97-897d-9657c6117094" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_f1f40b5a-c22f-47ed-b525-8f7cc14d36de" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_f1f40b5a-c22f-47ed-b525-8f7cc14d36de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_6b73bb56-a38e-440b-809a-f910bd3aa597" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_6b73bb56-a38e-440b-809a-f910bd3aa597" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_1a085df8-07d0-4861-8a4e-86be7d0962e8" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_1a085df8-07d0-4861-8a4e-86be7d0962e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_782e8d10-b66e-4a88-a711-e4db9be6dfdf" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_782e8d10-b66e-4a88-a711-e4db9be6dfdf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_3394e5e7-d0fd-41eb-ad36-a5d58e2686b8" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_3394e5e7-d0fd-41eb-ad36-a5d58e2686b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_31f38c1d-6750-4bf9-abac-98236dcfc24a" 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_accc6550-b43c-46c6-8c4d-2a310a6e6f95" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_31f38c1d-6750-4bf9-abac-98236dcfc24a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/SIGNIFICANTACCOUNTINGPOLICIESRestructuringCostsDetails" xlink:type="simple" xlink:href="tls-20240630.xsd#SIGNIFICANTACCOUNTINGPOLICIESRestructuringCostsDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/SIGNIFICANTACCOUNTINGPOLICIESRestructuringCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_e71ceabb-58b5-4703-8366-5712134a572c" 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_cb03d7d0-6a99-4bf6-a968-9dc74c6b6a0c" 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_e71ceabb-58b5-4703-8366-5712134a572c" xlink:to="loc_us-gaap_SeveranceCosts1_cb03d7d0-6a99-4bf6-a968-9dc74c6b6a0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringCosts_27b08372-301e-403d-9d59-cb8adf20f6d1" 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_e71ceabb-58b5-4703-8366-5712134a572c" xlink:to="loc_us-gaap_OtherRestructuringCosts_27b08372-301e-403d-9d59-cb8adf20f6d1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/ACCOUNTSRECEIVABLENETDetails" xlink:type="simple" xlink:href="tls-20240630.xsd#ACCOUNTSRECEIVABLENETDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/ACCOUNTSRECEIVABLENETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_22724482-51e6-47c4-88a9-0096fa4c9929" 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_7de95ab9-add5-496d-8fd6-63f544be2da5" 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_22724482-51e6-47c4-88a9-0096fa4c9929" xlink:to="loc_us-gaap_BilledContractReceivables_7de95ab9-add5-496d-8fd6-63f544be2da5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledContractsReceivable_cfb5d383-0f56-4760-9aba-c45aed83c2b2" 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_22724482-51e6-47c4-88a9-0096fa4c9929" xlink:to="loc_us-gaap_UnbilledContractsReceivable_cfb5d383-0f56-4760-9aba-c45aed83c2b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_373aa744-7558-45b7-9278-33878b81423e" 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_22724482-51e6-47c4-88a9-0096fa4c9929" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_373aa744-7558-45b7-9278-33878b81423e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_9ae216f8-fe61-4b5c-9bd8-f5f5b1ba7003" 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_22724482-51e6-47c4-88a9-0096fa4c9929" xlink:to="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_9ae216f8-fe61-4b5c-9bd8-f5f5b1ba7003" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INVENTORIESNETDetails" xlink:type="simple" xlink:href="tls-20240630.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_6241f278-19ba-42d3-b9b8-3bbcacf602b0" 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_8672501f-203a-4ea9-adb0-66d4bafb8666" 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_6241f278-19ba-42d3-b9b8-3bbcacf602b0" xlink:to="loc_us-gaap_InventoryGross_8672501f-203a-4ea9-adb0-66d4bafb8666" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryValuationReserves_81396c69-2d9b-49d1-b308-3cc1e6b29be5" 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_6241f278-19ba-42d3-b9b8-3bbcacf602b0" xlink:to="loc_us-gaap_InventoryValuationReserves_81396c69-2d9b-49d1-b308-3cc1e6b29be5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/PROPERTYANDEQUIPMENTNETPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="tls-20240630.xsd#PROPERTYANDEQUIPMENTNETPropertyPlantandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/PROPERTYANDEQUIPMENTNETPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_58643590-d5b5-4b4a-aad9-8e3fd15e1d95" 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_1bc6e548-4c4f-4321-9a81-470f9949b87a" 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_58643590-d5b5-4b4a-aad9-8e3fd15e1d95" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_1bc6e548-4c4f-4321-9a81-470f9949b87a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_9419db08-b583-489e-8c6a-407e4206e6b4" 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_58643590-d5b5-4b4a-aad9-8e3fd15e1d95" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_9419db08-b583-489e-8c6a-407e4206e6b4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="tls-20240630.xsd#INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_54da469d-a361-4a07-b1d3-1ebacc6b9493" 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_61f0ee3e-bb6b-46a0-b4c1-bea9da9a6358" 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_54da469d-a361-4a07-b1d3-1ebacc6b9493" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_61f0ee3e-bb6b-46a0-b4c1-bea9da9a6358" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_7857c324-d5cf-4f21-81cf-7edc64c2e398" 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_54da469d-a361-4a07-b1d3-1ebacc6b9493" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_7857c324-d5cf-4f21-81cf-7edc64c2e398" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_cee3ff05-400e-4745-94f0-0ff39e080853" 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_adbceb77-0a43-4df5-adbb-5d3aecc5f633" 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_cee3ff05-400e-4745-94f0-0ff39e080853" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_adbceb77-0a43-4df5-adbb-5d3aecc5f633" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_e3a3ea5f-dc96-45c5-8daa-cbf5df4dba14" 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_cee3ff05-400e-4745-94f0-0ff39e080853" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_e3a3ea5f-dc96-45c5-8daa-cbf5df4dba14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_80ed53a0-09d7-4b47-a0be-e8aebccc8dc8" 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_a40f7e83-84b9-4117-85dd-5fa9fe62c068" 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_80ed53a0-09d7-4b47-a0be-e8aebccc8dc8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a40f7e83-84b9-4117-85dd-5fa9fe62c068" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7f3e8a22-0837-4544-a6b2-08f393553d5f" 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_80ed53a0-09d7-4b47-a0be-e8aebccc8dc8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7f3e8a22-0837-4544-a6b2-08f393553d5f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INTANGIBLEASSETSNETFiniteLivedIntangibleAssetsDetails_1" xlink:type="simple" xlink:href="tls-20240630.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_b204e948-f6e0-4e6c-80ae-1f79cc3c0471" 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_1172b83a-6437-41ab-82ae-de90036b13cf" 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_b204e948-f6e0-4e6c-80ae-1f79cc3c0471" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1172b83a-6437-41ab-82ae-de90036b13cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_edcbd86d-4edd-42d4-b818-9b0b73a1f5a7" 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_b204e948-f6e0-4e6c-80ae-1f79cc3c0471" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_edcbd86d-4edd-42d4-b818-9b0b73a1f5a7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/INTANGIBLEASSETSNETAmortizationExpenseDetails" xlink:type="simple" xlink:href="tls-20240630.xsd#INTANGIBLEASSETSNETAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://telos.com/role/INTANGIBLEASSETSNETAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_tls_IntangibleAssetsAmortizationExpense_dedb1975-5ebd-4a6c-9f63-2b032ecd7b1c" xlink:href="tls-20240630.xsd#tls_IntangibleAssetsAmortizationExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_d3c1874d-62bd-4140-8b0d-b10af77cccfd" 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_dedb1975-5ebd-4a6c-9f63-2b032ecd7b1c" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_d3c1874d-62bd-4140-8b0d-b10af77cccfd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_abf7cea7-c8b4-41be-a178-263d8b705e99" 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_dedb1975-5ebd-4a6c-9f63-2b032ecd7b1c" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_abf7cea7-c8b4-41be-a178-263d8b705e99" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSOtherAssetsDetails" xlink:type="simple" xlink:href="tls-20240630.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_8a1540ec-b68c-482d-abc6-d0e40f655fb7" 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_bd12ea92-14fd-4b89-924b-892161f3c190" 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_8a1540ec-b68c-482d-abc6-d0e40f655fb7" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_bd12ea92-14fd-4b89-924b-892161f3c190" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_dac07531-f4fa-4e0d-bf88-719ca9f12c4f" 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_8a1540ec-b68c-482d-abc6-d0e40f655fb7" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_dac07531-f4fa-4e0d-bf88-719ca9f12c4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_29473945-be91-486d-a75e-c138dbee4ba1" 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_8a1540ec-b68c-482d-abc6-d0e40f655fb7" xlink:to="loc_us-gaap_Investments_29473945-be91-486d-a75e-c138dbee4ba1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSAccountsPayableandOtherAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="tls-20240630.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_ab128c7f-43d5-4578-8d8f-41c00f0dabdd" 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_538d0b7c-20be-4e09-8935-22ca32afab33" 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_ab128c7f-43d5-4578-8d8f-41c00f0dabdd" xlink:to="loc_us-gaap_AccountsPayableCurrent_538d0b7c-20be-4e09-8935-22ca32afab33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_61bab6b8-a992-4c52-ac44-a77347fcd4e2" 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_ab128c7f-43d5-4578-8d8f-41c00f0dabdd" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_61bab6b8-a992-4c52-ac44-a77347fcd4e2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/OTHERBALANCESHEETCOMPONENTSOtherCurrentLiabilitiesDetails" xlink:type="simple" xlink:href="tls-20240630.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_2b3eea64-6835-44ea-83b7-2d8e67ee1faa" 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_aa729f2e-a7f2-4ba2-9127-530ffd39fbe4" xlink:href="tls-20240630.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_2b3eea64-6835-44ea-83b7-2d8e67ee1faa" xlink:to="loc_tls_OtherAccruedExpensesCurrent_aa729f2e-a7f2-4ba2-9127-530ffd39fbe4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_tls_OtherCurrentLiabilitiesOther_0ed9011a-4ac3-4659-8d46-004bb66f393f" xlink:href="tls-20240630.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_2b3eea64-6835-44ea-83b7-2d8e67ee1faa" xlink:to="loc_tls_OtherCurrentLiabilitiesOther_0ed9011a-4ac3-4659-8d46-004bb66f393f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_50e24a41-d3a2-4fc8-b825-161614e2b640" 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_2b3eea64-6835-44ea-83b7-2d8e67ee1faa" xlink:to="loc_us-gaap_RestructuringReserveCurrent_50e24a41-d3a2-4fc8-b825-161614e2b640" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://telos.com/role/SUPPLEMENTALCASHFLOWINFORMATIONCashCashEquivalentsandRestrictedCashDetails" xlink:type="simple" xlink:href="tls-20240630.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_2175d9b3-f0fc-4e5a-bb78-18865ff6f980" 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_454f6165-5a4d-4bb4-acca-372ff58d0ba1" 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_2175d9b3-f0fc-4e5a-bb78-18865ff6f980" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_454f6165-5a4d-4bb4-acca-372ff58d0ba1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_d19727b6-f630-4200-a907-93611f3fa7e9" 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_2175d9b3-f0fc-4e5a-bb78-18865ff6f980" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_d19727b6-f630-4200-a907-93611f3fa7e9" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
