<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/nport" xmlns:com="http://www.sec.gov/edgar/common" xmlns:ncom="http://www.sec.gov/edgar/nportcommon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sec.gov/edgar/nport eis_NPORT_Filer.xsd">
  <headerData>
    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0001579881</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000086986</seriesId>
        <classId>C000252656</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>Calamos ETF Trust</regName>
      <regFileNumber>811-22887</regFileNumber>
      <regCik>0001579881</regCik>
      <regLei>549300B2KP9WEFDULJ54</regLei>
      <regStreet1>2020 CALAMOS COURT</regStreet1>
      <regCity>NAPERVILLE</regCity>
      <regStateConditional regCountry="US" regState="US-IL"/>
      <regZipOrPostalCode>60563</regZipOrPostalCode>
      <regPhone>630-245-7200</regPhone>
      <seriesName>Calamos S&amp;P 500 Structured Alt Protection ETF - October</seriesName>
      <seriesId>S000086986</seriesId>
      <seriesLei>529900FD0RPBHLDV4K79</seriesLei>
      <repPdEnd>2025-07-31</repPdEnd>
      <repPdDate>2025-04-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>16704761.81</totAssets>
      <totLiabs>804886.01</totLiabs>
      <netAssets>15899875.80</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
      <amtPayAftOneYrOthAffil>0.00000000</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>0.00000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000252656" rtn1="-0.16000000" rtn2="-0.97000000" rtn3="0.08000000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="68158.09000000" netUnrealizedAppr="-82659.19000000"/>
            <mon2 netRealizedGain="54532.77000000" netUnrealizedAppr="-239118.48000000"/>
            <mon3 netRealizedGain="49511.95000000" netUnrealizedAppr="-36165.86000000"/>
            <optionCategory>
              <instrMon1 netRealizedGain="68158.09000000" netUnrealizedAppr="-82659.19000000"/>
              <instrMon2 netRealizedGain="54532.77000000" netUnrealizedAppr="-239118.48000000"/>
              <instrMon3 netRealizedGain="49511.95000000" netUnrealizedAppr="-36165.86000000"/>
            </optionCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
      </returnInfo>
      <mon1Flow redemption="1930893.30000000" reinvestment="0.00000000" sales="0.00000000"/>
      <mon2Flow redemption="1916251.10000000" reinvestment="0.00000000" sales="0.00000000"/>
      <mon3Flow redemption="2530615.06000000" reinvestment="0.00000000" sales="0.00000000"/>


      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>S&amp;P 500</nameDesignatedIndex>
          <indexIdentifier>S&amp;P 500</indexIdentifier>

        </fundsDesignatedInfo>

      </varInfo>
    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>Goldman Sachs &amp; Co. LLC</name>
        <lei>FOR8UP27PHTHYVLBNG30</lei>
        <title>4SPY 250930 P 573.76</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="AEII17195"/>
        </identifiers>
        <balance>275.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>942289.37000000</valUSD>
        <pctVal>5.926394531962</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Goldman Sachs &amp; Co. LLC</counterpartyName>
              <counterpartyLei>FOR8UP27PHTHYVLBNG30</counterpartyLei>
            </counterparties>
            <putOrCall>Put</putOrCall>
            <writtenOrPur>Purchased</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>SPDR S&amp;P 500 ETF Trust</issuerName>
                <issueTitle>SPDR S&amp;P 500 ETF Trust</issueTitle>
                <identifiers>
                  <cusip value="78462F103"/>
                  <isin value="US78462F1030"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>573.76000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2025-09-30</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>100690.37000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Goldman Sachs &amp; Co. LLC</name>
        <lei>FOR8UP27PHTHYVLBNG30</lei>
        <title>4SPY 250930 C 612.03</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="AEII17187"/>
        </identifiers>
        <balance>-275.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-183395.36000000</valUSD>
        <pctVal>-1.15343894698</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Goldman Sachs &amp; Co. LLC</counterpartyName>
              <counterpartyLei>FOR8UP27PHTHYVLBNG30</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>SPDR S&amp;P 500 ETF Trust</issuerName>
                <issueTitle>SPDR S&amp;P 500 ETF Trust</issueTitle>
                <identifiers>
                  <cusip value="78462F103"/>
                  <isin value="US78462F1030"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>612.03000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2025-09-30</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>421318.64000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Goldman Sachs &amp; Co. LLC</name>
        <lei>FOR8UP27PHTHYVLBNG30</lei>
        <title>4SPY 250930 C 0.80</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="AEII17203"/>
        </identifiers>
        <balance>275.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>15157758.44000000</valUSD>
        <pctVal>95.33255876124</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Goldman Sachs &amp; Co. LLC</counterpartyName>
              <counterpartyLei>FOR8UP27PHTHYVLBNG30</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Purchased</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>SPDR S&amp;P 500 ETF Trust</issuerName>
                <issueTitle>SPDR S&amp;P 500 ETF Trust</issueTitle>
                <identifiers>
                  <cusip value="78462F103"/>
                  <isin value="US78462F1030"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>0.80000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2025-09-30</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-636404.56000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2025-06-10</ncom:dateSigned>
      <ncom:nameOfApplicant>Calamos ETF Trust</ncom:nameOfApplicant>
      <ncom:signature>Stephen Atkins</ncom:signature>
      <ncom:signerName>Stephen Atkins</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
