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    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000778207</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000025331</seriesId>
        <classId>C000075538</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
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    <genInfo>
      <regName>TRANSAMERICA SERIES TRUST</regName>
      <regFileNumber>811-04419</regFileNumber>
      <regCik>0000778207</regCik>
      <regLei>5493000QR1WGXIM5V222</regLei>
      <regStreet1>1801 CALIFORNIA STREET</regStreet1>
      <regStreet2>SUITE 5200</regStreet2>
      <regCity>DENVER</regCity>
      <regStateConditional regCountry="US" regState="US-CO"/>
      <regZipOrPostalCode>80202</regZipOrPostalCode>
      <regPhone>720-493-4256</regPhone>
      <seriesName>Transamerica ProFund UltraBear VP</seriesName>
      <seriesId>S000025331</seriesId>
      <seriesLei>549300BWIKLC5X3SPF71</seriesLei>
      <repPdEnd>2020-12-31</repPdEnd>
      <repPdDate>2020-06-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>18239279.61</totAssets>
      <totLiabs>15619.37</totLiabs>
      <netAssets>18223660.24</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>1959500.63000000</cshNotRptdInCorD>
      <curMetrics>
        <curMetric>
          <curCd>USD</curCd>
          <intrstRtRiskdv01 period10Yr="0.00000000" period1Yr="0.00000000" period30Yr="0.00000000" period3Mon="-830.57000000" period5Yr="0.00000000"/>
          <intrstRtRiskdv100 period10Yr="0.00000000" period1Yr="0.00000000" period30Yr="0.00000000" period3Mon="-83147.25000000" period5Yr="0.00000000"/>
        </curMetric>
      </curMetrics>
      <creditSprdRiskInvstGrade period10Yr="0.00000000" period1Yr="0.00000000" period30Yr="0.00000000" period3Mon="0.00000000" period5Yr="0.00000000"/>
      <creditSprdRiskNonInvstGrade period10Yr="0.00000000" period1Yr="0.00000000" period30Yr="0.00000000" period3Mon="0.00000000" period5Yr="0.00000000"/>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000075538" rtn1="-27.27000000" rtn2="-8.33000000" rtn3="-4.55000000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="-6607501.10000000" netUnrealizedAppr="-2242128.17000000"/>
            <mon2 netRealizedGain="-3182588.61000000" netUnrealizedAppr="886507.51000000"/>
            <mon3 netRealizedGain="-6154785.48000000" netUnrealizedAppr="4960898.71000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="-6607501.10000000" netUnrealizedAppr="-2242128.17000000"/>
              <instrMon2 netRealizedGain="-3182588.61000000" netUnrealizedAppr="886507.51000000"/>
              <instrMon3 netRealizedGain="-6154785.48000000" netUnrealizedAppr="4960898.71000000"/>
            </futureCategory>
          </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="6715469.00000000" reinvestment="0.00000000" sales="5152541.62000000"/>
      <mon2Flow redemption="2261663.10000000" reinvestment="0.00000000" sales="1208111.76000000"/>
      <mon3Flow redemption="1690232.82000000" reinvestment="0.00000000" sales="1872491.71000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>Chicago Mercantile Exchange</name>
        <lei>SNZ2OJLFK8MNNCLQOF39</lei>
        <title>S+P500 EMINI FUT  SEP20 XCME 20200918</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="ADI1CVS09"/>
        </identifiers>
        <balance>-245.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>752807.81000000</valUSD>
        <pctVal>4.130936376588</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Chicago Mercantile Exchange</counterpartyName>
              <counterpartyLei>SNZ2OJLFK8MNNCLQOF39</counterpartyLei>
            </counterparties>
            <payOffProf>Short</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>E-mini S&amp;P 500 Index</indexName>
                <indexIdentifier>ESU0 Index</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2020-09-18</expDate>
            <notionalAmt>-38608370.31000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>752807.81000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>State Street Global Advisors</name>
        <lei>549300BZ5TGIFZUZDZ37</lei>
        <title>State Street Institutional US Government Money Market Fund</title>
        <cusip>857492706</cusip>
        <identifiers>
          <isin value="US8574927062"/>
        </identifiers>
        <balance>3108457.36000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3108457.36000000</valUSD>
        <pctVal>17.05726137923</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BlackRock Liquidity Funds</name>
        <lei>5493002L9DNZ83RX7V61</lei>
        <title>BlackRock Liquidity Funds: T-Fund, Institutional Shares</title>
        <cusip>09248U718</cusip>
        <identifiers>
          <isin value="US09248U7182"/>
        </identifiers>
        <balance>3108457.35000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3108457.35000000</valUSD>
        <pctVal>17.05726132435</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>UBS Select Treasury Preferred Fund</name>
        <lei>549300DXQ8KM8WHPPG39</lei>
        <title>UBS Select Treasury Preferred Fund</title>
        <cusip>90262Y877</cusip>
        <identifiers>
          <isin value="US90262Y8773"/>
        </identifiers>
        <balance>3108457.35000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3108457.35000000</valUSD>
        <pctVal>17.05726132435</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>The Dreyfus Corporation</name>
        <lei>549300MKKM9KT7BF6329</lei>
        <title>Dreyfus Treasury &amp; Agency Cash Management Institutional Shares</title>
        <cusip>261908107</cusip>
        <identifiers>
          <isin value="US2619081076"/>
        </identifiers>
        <balance>3109345.04000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3109345.04000000</valUSD>
        <pctVal>17.06213240946</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>FIXED INC CLEARING CORP.REPO</name>
        <lei>549300H47WTHXPU08X20</lei>
        <title>FIXED INC CLEARING CORP.REPO</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="85748R009"/>
        </identifiers>
        <balance>3108457.35000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>3108457.35000000</valUSD>
        <pctVal>17.05726132435</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <clearedCentCparty centralCounterparty="FIXED INC CLEARING CORP.REPO" isCleared="Y"/>
          <isTriParty>N</isTriParty>
          <repurchaseRt>0.00000000</repurchaseRt>
          <maturityDt>2020-07-01</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>2948700.00000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>3170640.69000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <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>2020-07-24</ncom:dateSigned>
      <ncom:nameOfApplicant>TRANSAMERICA SERIES TRUST</ncom:nameOfApplicant>
      <ncom:signature>Vincent Toner</ncom:signature>
      <ncom:signerName>Vincent Toner</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
