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          <ccc>XXXXXXXX</ccc>
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        <classId>C000198085</classId>
        <classId>C000198084</classId>
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    </filerInfo>
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      <regCik>0000916053</regCik>
      <regLei>PJVR01EN4PJWVNUIQ236</regLei>
      <regStreet1>1295 STATE STREET</regStreet1>
      <regCity>SPRINGFIELD</regCity>
      <regStateConditional regCountry="US" regState="US-MA"/>
      <regZipOrPostalCode>01111-0001</regZipOrPostalCode>
      <regPhone>413-744-1000</regPhone>
      <seriesName>MassMutual Select T. Rowe Price Retirement 2040 Fund</seriesName>
      <seriesId>S000061121</seriesId>
      <seriesLei>549300N5B4IU7SW59114</seriesLei>
      <repPdEnd>2025-09-30</repPdEnd>
      <repPdDate>2025-06-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
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      <totLiabs>112299.53</totLiabs>
      <netAssets>275047079.72</netAssets>
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      <assetsInvested>0.00000000</assetsInvested>
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      </invstOrSec>
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        <name>MassMutual Select T Rowe Price Large Cap Blend Fund Class</name>
        <lei>N/A</lei>
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        <name>MassMutual Select T Rowe Price Small and Mid Cap Blend Fund</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>T Rowe Price Limited Duration Inflation Focused Bond Fund</name>
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      </invstOrSec>
      <invstOrSec>
        <name>MassMutual Select T Rowe Price Bond Asset Fund</name>
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        <title>MassMutual Select T Rowe Price Bond Asset Fund</title>
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        <name>MassMutual Select T Rowe Price Real Assets Fund</name>
        <lei>549300R72Z32F8UXRK48</lei>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      </invstOrSec>
      <invstOrSec>
        <name>T Rowe Price US Treasury Long-Term Index Fund</name>
        <lei>81MQEQSHGI5PN6BWN277</lei>
        <title>T Rowe Price US Treasury Long-Term Index Fund</title>
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        <fairValLevel>1</fairValLevel>
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      </invstOrSec>
      <invstOrSec>
        <name>T Rowe Price Institutional Floating Rate Fund</name>
        <lei>863VOPTBPYYVTH00FU88</lei>
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        <cusip>77958B402</cusip>
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      </invstOrSec>
      <invstOrSec>
        <name>T Rowe Price US Treasury Money Fund Inc</name>
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        <fairValLevel>1</fairValLevel>
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      </invstOrSec>
      <invstOrSec>
        <name>T Rowe Price Dynamic Global Bond Fund</name>
        <lei>549300RBL73KV0WZZF27</lei>
        <title>T Rowe Price Dynamic Global Bond Fund</title>
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        <fairValLevel>1</fairValLevel>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>MassMutual Select T Rowe Price International Equity Fund</name>
        <lei>549300G89FEBNQ8XDD49</lei>
        <title>MassMutual Select T Rowe Price International Equity Fund</title>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      </invstOrSec>
      <invstOrSec>
        <name>T Rowe Price Emerging Markets Bond Fund</name>
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          <isin value="US77956H5349"/>
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        <balance>156024.13000000</balance>
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        <valUSD>1452584.61000000</valUSD>
        <pctVal>0.528122171476</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <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>2025-07-28</ncom:dateSigned>
      <ncom:nameOfApplicant>MASSMUTUAL SELECT FUNDS</ncom:nameOfApplicant>
      <ncom:signature>Renee Hitchcock</ncom:signature>
      <ncom:signerName>Renee Hitchcock</ncom:signerName>
      <ncom:title>CFO and Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
