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		<isConfidential>false</isConfidential>
		<filerInfo>

			<filer>
				<issuerCredentials>
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					<ccc>XXXXXXXX</ccc>
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			<seriesClassInfo>
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				<classId>C000010262</classId>
				<classId>C000010264</classId>
				<classId>C000010265</classId>
				<classId>C000010266</classId>
				<classId>C000140371</classId>
				<classId>C000140372</classId>
				<classId>C000140373</classId>
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		<genInfo>
			<regName>MASSMUTUAL SELECT FUNDS</regName>
			<regFileNumber>811-08274</regFileNumber>
			<regCik>0000916053</regCik>
			<regLei>PJVR01EN4PJWVNUIQ236</regLei>
			<regStreet1>100 BRIGHT MEADOW BLVD.</regStreet1>
			<regCity>ENFIELD</regCity>
			<regStateConditional regCountry="US" regState="US-CT"/>
			<regZipOrPostalCode>06082-1981</regZipOrPostalCode>
			<regPhone>8605621000</regPhone>
			<seriesName>MassMutual RetireSMART by JPMorgan 2020 Fund</seriesName>
			<seriesId>S000003675</seriesId>
			<seriesLei>549300KKTI7TU7LB2P61</seriesLei>
			<repPdEnd>2020-09-30</repPdEnd>
			<repPdDate>2019-12-31</repPdDate>
			<isFinalFiling>N</isFinalFiling>
		</genInfo>
		<fundInfo>
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			<totLiabs>14002401.58</totLiabs>
			<netAssets>391236936.44</netAssets>
			<assetsAttrMiscSec>0</assetsAttrMiscSec>
			<assetsInvested>0</assetsInvested>
			<amtPayOneYrBanksBorr>0</amtPayOneYrBanksBorr>
			<amtPayOneYrCtrldComp>0</amtPayOneYrCtrldComp>
			<amtPayOneYrOthAffil>0</amtPayOneYrOthAffil>
			<amtPayOneYrOther>0</amtPayOneYrOther>
			<amtPayAftOneYrBanksBorr>0</amtPayAftOneYrBanksBorr>
			<amtPayAftOneYrCtrldComp>0</amtPayAftOneYrCtrldComp>
			<amtPayAftOneYrOthAffil>0</amtPayAftOneYrOthAffil>
			<amtPayAftOneYrOther>0</amtPayAftOneYrOther>
			<delayDeliv>0</delayDeliv>
			<standByCommit>0</standByCommit>
			<liquidPref>0</liquidPref>
			<cshNotRptdInCorD>0</cshNotRptdInCorD>
			<isNonCashCollateral>N</isNonCashCollateral>
			<returnInfo>
				<monthlyTotReturns>
					<monthlyTotReturn classId="C000010262" rtn1="1.44" rtn2="0.95" rtn3="1.05"/>
					<monthlyTotReturn classId="C000010264" rtn1="1.37" rtn2="0.9" rtn3="1.08"/>
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				<monthlyReturnCats/>
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				<othMon2 netRealizedGain="-507186.64" netUnrealizedAppr="4353758.34"/>
				<othMon3 netRealizedGain="15082.13" netUnrealizedAppr="4103063.13"/>
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			<mon2Flow redemption="11478156.26" reinvestment="0" sales="7509394.89"/>
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		<invstOrSecs>
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				<name>BARINGS GLOBAL FLOATING RATE F</name>
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				<title>BARINGS GLBL FLTNG RT Y</title>
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					<ticker value="BXFYX"/>
					<other otherDesc="SEDOL Number" value="BDHDVM1"/>
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				<curCd>USD</curCd>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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					<isNonCashCollateral>N</isNonCashCollateral>
					<isLoanByFund>N</isLoanByFund>
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				<name>JPMORGAN EMERGING MARKETS DEBT</name>
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				<curCd>USD</curCd>
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				<payoffProfile>Long</payoffProfile>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
					<isCashCollateral>N</isCashCollateral>
					<isNonCashCollateral>N</isNonCashCollateral>
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			<invstOrSec>
				<name>JPMORGAN EMERGING MARKETS STRA</name>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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					<isNonCashCollateral>N</isNonCashCollateral>
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			<invstOrSec>
				<name>JPMORGAN INTERNATIONAL RESEARC</name>
				<lei>HXS35OABUD2FH4OQXR78</lei>
				<title>JPM INTL RES ENH EQ INDX R6</title>
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				<identifiers>
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					<ticker value="JEIQX"/>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
					<isCashCollateral>N</isCashCollateral>
					<isNonCashCollateral>N</isNonCashCollateral>
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			</invstOrSec>
			<invstOrSec>
				<name>JPMORGAN REALTY INCOME FUND</name>
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					<isin value="US9045044537"/>
					<ticker value="JPINX"/>
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				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>4566112.03</valUSD>
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				<payoffProfile>Long</payoffProfile>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
					<isCashCollateral>N</isCashCollateral>
					<isNonCashCollateral>N</isNonCashCollateral>
					<isLoanByFund>N</isLoanByFund>
				</securityLending>
			</invstOrSec>
			<invstOrSec>
				<name>JPMORGAN US GOVERNMENT MONEY M</name>
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				<curCd>USD</curCd>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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					<isLoanByFund>N</isLoanByFund>
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			<invstOrSec>
				<name>MASSMUTUAL PREMIER CORE BOND F</name>
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				<cusip>57629H350</cusip>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
					<isCashCollateral>N</isCashCollateral>
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				<name>MASSMUTUAL PREMIER HIGH YIELD</name>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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			<invstOrSec>
				<name>MASSMUTUAL PREMIER INTERNATION</name>
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				<identifiers>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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					<isLoanByFund>N</isLoanByFund>
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				<name>MASSMUTUAL PREMIER STRATEGIC E</name>
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				<title>MASSMUTUAL PREMIER ST EMMK I</title>
				<cusip>57629H293</cusip>
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				<curCd>USD</curCd>
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				<payoffProfile>Long</payoffProfile>
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				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
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					<isNonCashCollateral>N</isNonCashCollateral>
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			</invstOrSec>
			<invstOrSec>
				<name>MASSMUTUAL SELECT BLUE CHIP GR</name>
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				<title>MASSMUTUAL SEL BL CH GR I</title>
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				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
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			</invstOrSec>
			<invstOrSec>
				<name>MASSMUTUAL SELECT DIVERSIFIED</name>
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				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
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					<isLoanByFund>N</isLoanByFund>
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			<invstOrSec>
				<name>MASSMUTUAL SELECT FOCUSED VALU</name>
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				<title>MASSMUTUAL SEL FOC VALUE I</title>
				<cusip>57630A626</cusip>
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				<curCd>USD</curCd>
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				<issuerCat>RF</issuerCat>
				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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					<isNonCashCollateral>N</isNonCashCollateral>
					<isLoanByFund>N</isLoanByFund>
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			</invstOrSec>
			<invstOrSec>
				<name>MASSMUTUAL SELECT FUNDAMENTAL</name>
				<lei>549300KVPK2RZW6Y4C91</lei>
				<title>MASSMUTUAL SEL FUNDA VAL I</title>
				<cusip>57630A634</cusip>
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					<ticker value="MFUZX"/>
					<other otherDesc="SEDOL Number" value="B3S43M7"/>
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				<curCd>USD</curCd>
				<valUSD>7147851.01</valUSD>
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				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</assetCat>
				<issuerCat>RF</issuerCat>
				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
					<isCashCollateral>N</isCashCollateral>
					<isNonCashCollateral>N</isNonCashCollateral>
					<isLoanByFund>N</isLoanByFund>
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			</invstOrSec>
			<invstOrSec>
				<name>MASSMUTUAL SELECT FUNDAMENTAL</name>
				<lei>5493001X2CXO2NCCWO46</lei>
				<title>MASSMUTUAL SEL FUNDAMENTAL I</title>
				<cusip>57630E784</cusip>
				<identifiers>
					<isin value="US57630E7849"/>
					<ticker value="MOTZX"/>
					<other otherDesc="SEDOL Number" value="BLBP226"/>
				</identifiers>
				<balance>582053.287</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>4289732.73</valUSD>
				<pctVal>1.096453921</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</assetCat>
				<issuerCat>RF</issuerCat>
				<invCountry>US</invCountry>

				<isRestrictedSec>N</isRestrictedSec>

				<fairValLevel>1</fairValLevel>
				<securityLending>
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					<isNonCashCollateral>N</isNonCashCollateral>
					<isLoanByFund>N</isLoanByFund>
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			</invstOrSec>
			<invstOrSec>
				<name>MASSMUTUAL SELECT GROWTH OPPOR</name>
				<lei>549300B6PINPSEC9ND74</lei>
				<title>MASSMUTUAL SEL GROW OPP I</title>
				<cusip>57630A386</cusip>
				<identifiers>
					<isin value="US57630A3867"/>
					<ticker value="MMAZX"/>
					<other otherDesc="SEDOL Number" value="B6ZQ9D0"/>
				</identifiers>
				<balance>370793.686</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>2903314.56</valUSD>
				<pctVal>0.7420860071</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT MID CAP GROW</name>
				<lei>549300LPDVDBGPODUD56</lei>
				<title>MASSMUTL SEL M/C GR E II I</title>
				<cusip>57630A592</cusip>
				<identifiers>
					<isin value="US57630A5920"/>
					<ticker value="MEFZX"/>
					<other otherDesc="SEDOL Number" value="B68YWQ5"/>
				</identifiers>
				<balance>138130.885</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>3272320.67</valUSD>
				<pctVal>0.836403817</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT MID CAP VALU</name>
				<lei>549300IIX63KTQHRGE14</lei>
				<title>MASSMUTUAL SEL M/C VALUE I</title>
				<cusip>57630A378</cusip>
				<identifiers>
					<isin value="US57630A3784"/>
					<ticker value="MLUZX"/>
					<other otherDesc="SEDOL Number" value="B3R8SP8"/>
				</identifiers>
				<balance>249604.951</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>3254848.56</valUSD>
				<pctVal>0.8319379529</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT OVERSEAS FUN</name>
				<lei>RFO5LMPC4ZPVN8YRTC66</lei>
				<title>MASSMUTUAL SEL OVERSEAS I</title>
				<cusip>57630A576</cusip>
				<identifiers>
					<isin value="US57630A5763"/>
					<ticker value="MOSZX"/>
					<other otherDesc="SEDOL Number" value="B3Q8HF2"/>
				</identifiers>
				<balance>2100499.255</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>18526403.43</valUSD>
				<pctVal>4.735341095</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT SMALL CAP GR</name>
				<lei>9T0957ZK0MF24NE45C35</lei>
				<title>MASSMUTUAL SEL S/C GR EQ I</title>
				<cusip>57630A584</cusip>
				<identifiers>
					<isin value="US57630A5847"/>
					<ticker value="MSGZX"/>
					<other otherDesc="SEDOL Number" value="B45KKQ8"/>
				</identifiers>
				<balance>125394.209</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>1873389.48</valUSD>
				<pctVal>0.4788375804</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT SMALL CAP VA</name>
				<lei>549300BN7CXS1EJMX342</lei>
				<title>MASSMUTUAL SEL S/C VL EQ I</title>
				<cusip>57630E651</cusip>
				<identifiers>
					<isin value="US57630E6510"/>
					<ticker value="MMQIX"/>
					<other otherDesc="SEDOL Number" value="BLBP1N0"/>
				</identifiers>
				<balance>223916.611</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>2492191.88</valUSD>
				<pctVal>0.6370032192</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT STRATEGIC BO</name>
				<lei>761OL3UHRIX25W4KQ497</lei>
				<title>MASSMUTUAL SEL STRATEG BD I</title>
				<cusip>57630E578</cusip>
				<identifiers>
					<isin value="US57630E5785"/>
					<ticker value="MSBZX"/>
					<other otherDesc="SEDOL Number" value="BLBP1D0"/>
				</identifiers>
				<balance>2561257.669</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>27431069.63</valUSD>
				<pctVal>7.0113701123</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MASSMUTUAL SELECT TOTAL RETURN</name>
				<lei>5SN68FW6WBKEUI82IP46</lei>
				<title>MASSMUTUAL SEL TR BOND I</title>
				<cusip>57630A642</cusip>
				<identifiers>
					<isin value="US57630A6423"/>
					<ticker value="MSPZX"/>
					<other otherDesc="SEDOL Number" value="B3S22P7"/>
				</identifiers>
				<balance>2730022.306</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>27354823.51</valUSD>
				<pctVal>6.9918816354</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>MM SELECT EQUITY ASSET FUND</name>
				<lei>549300J2QYXGVT738886</lei>
				<title>MM SELECT EQUITY ASSET I</title>
				<cusip>57630G789</cusip>
				<identifiers>
					<isin value="US57630G7896"/>
					<ticker value="MSEJX"/>
				</identifiers>
				<balance>4382179.757</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>35933874.01</valUSD>
				<pctVal>9.1846834138</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>VANGUARD DEVELOPED MARKETS IND</name>
				<lei>3TVJ6OS71EDS4RAB2217</lei>
				<title>VANGUARD DEV MKT INDX INST</title>
				<cusip>921943882</cusip>
				<identifiers>
					<isin value="US9219438820"/>
					<ticker value="VTMNX"/>
					<other otherDesc="SEDOL Number" value="BYV12F8"/>
				</identifiers>
				<balance>463820.711</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>6567701.27</valUSD>
				<pctVal>1.6787017427</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>VANGUARD EMERGING MARKETS STOC</name>
				<lei>DR3FEI5HE6DDWHXGTR43</lei>
				<title>VANGUARD EM MKT STK IND INST</title>
				<cusip>922042601</cusip>
				<identifiers>
					<isin value="US9220426012"/>
					<ticker value="VEMIX"/>
					<other otherDesc="SEDOL Number" value="B168NK5"/>
				</identifiers>
				<balance>288989.01</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>8120591.18</valUSD>
				<pctVal>2.0756197648</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>VANGUARD MID CAP INDEX FUND</name>
				<lei>F7RXEPKL33W3OZ8V3S02</lei>
				<title>VANGUARD MID CAP INDEX ADM</title>
				<cusip>922908645</cusip>
				<identifiers>
					<isin value="US9229086452"/>
					<ticker value="VIMAX"/>
					<other otherDesc="SEDOL Number" value="B0BVY76"/>
				</identifiers>
				<balance>13187.137</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>2909873.65</valUSD>
				<pctVal>0.7437625078</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>VANGUARD REAL ESTATE INDEX FUN</name>
				<lei>B1HNOZOSPCLXHIVBEI82</lei>
				<title>VANGUARD REAL EST INDX ADM</title>
				<cusip>921908877</cusip>
				<identifiers>
					<isin value="US9219088773"/>
					<ticker value="VGSLX"/>
					<other otherDesc="SEDOL Number" value="BDD9V23"/>
				</identifiers>
				<balance>36335.178</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>4780982.72</valUSD>
				<pctVal>1.2220172163</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>VANGUARD SMALL CAP INDEX FUND</name>
				<lei>HZKQM2YGJWB4I8NIZL49</lei>
				<title>VANGUARD SML CAP INDX ADM</title>
				<cusip>922908686</cusip>
				<identifiers>
					<isin value="US9229086866"/>
					<ticker value="VSMAX"/>
					<other otherDesc="SEDOL Number" value="2570062"/>
				</identifiers>
				<balance>24437.074</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>1939570.56</valUSD>
				<pctVal>0.4957534372</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>VANGUARD TOTAL BOND MARKET IND</name>
				<lei>CIJB0QNLPT2SSWMJ5W92</lei>
				<title>VANGUARD TOT BD MKT IDX INST</title>
				<cusip>921937504</cusip>
				<identifiers>
					<isin value="US9219375048"/>
					<ticker value="VBTIX"/>
					<other otherDesc="SEDOL Number" value="2724944"/>
				</identifiers>
				<balance>1900791.002</balance>
				<units>NS</units>
				<curCd>USD</curCd>
				<valUSD>21003740.57</valUSD>
				<pctVal>5.3685474488</pctVal>
				<payoffProfile>Long</payoffProfile>
				<assetCat>EC</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>
		</invstOrSecs>
		<explntrNotes>
			<explntrNote note="Assets and liabilities are reported on a trade date basis, consistent with the MassMutual Funds' financial statements. Differences between N-PORT reported values and the Funds' financial statements may occur due to foreign securities' mark-to-market adjustments, expense adjustments, and other non-material items identified by the fund administrator during the financial statement review process.&#10;" noteItem="B.1.a"/>
			<explntrNote note="Assets and liabilities are reported on a trade date basis, consistent with the MassMutual Funds' financial statements. Differences between N-PORT reported values and the Funds' financial statements may occur due to foreign securities' mark-to-market adjustments, expense adjustments, and other non-material items identified by the fund administrator during the financial statement review process.&#10;" noteItem="B.1.b"/>
			<explntrNote note="Assets and liabilities are reported on a trade date basis, consistent with the MassMutual Funds' financial statements. Differences between N-PORT reported values and the Funds' financial statements may occur due to foreign securities' mark-to-market adjustments, expense adjustments, and other non-material items identified by the fund administrator during the financial statement review process.&#10;" noteItem="B.1.c"/>
			<explntrNote note="Payable amount for investments purchased on a delayed&#10;delivery, when issued, or other firm commitment basis generally is determined based on&#10;the number of days between trade date and settlement date.  Payable amount for purchases of bank loan securities for&#10;which the settlement date is unknown also are included." noteItem="B.2.d"/>
			<explntrNote note="Amounts reported include U.S. Dollar cash and the base equivalent of foreign currency balances (identified cost plus unrealized gain/loss). Amounts are derived from the fund's General Ledger and may differ from financial statements due to adjustments made by the fund administrator during the financial statement review process. " noteItem="B.2.f"/>
			<explntrNote note="DV01 indicates the estimated change in the price of the security given a one basis point change in the 'yield to worst' or the sensitivity of the security's value to a one basis point parallel shift in the yield curve. For floating rate securities, the value of DV01 is calculated by scaling the Effective Duration by 1/100th. For derivatives, when calculating the value of DV01, it is assumed that the volatility will not stay constant given a shift in the yield curve. Accordingly, the DV01 result shows the anticipated move in the present value/market value given a one basis point shift in the yield curve. Risk metrics at the security level are provided by a third-party vendor (ICE). As of the current filing, ICE has gaps in its coverage (e.g., certain CMOs, options on futures, non-U.S. futures). We have attempted to gather missing information from the Funds' subadvisers; however, missing security-level risk metrics may result in non-material errors in portfolio-level calculations._x000D_&#10;" noteItem="B.3.a"/>
			<explntrNote note="DV100 is based on the Effective Duration of the security and is an option-adjusted measure. It represents the average change in a security's market value (price plus accrued interest) given both up and down 100 basis point shifts in the underlying government par yield curve. This calculation incorporates the effect of embedded optionality for corporate bonds and changes in prepayments for mortgage-backed securities. In the event that a bond's currency has no associated government yield curve, the U.S. Treasury curve is used for the calculation. Risk metrics at the security level are provided by a third-party vendor (ICE). As of the current filing, ICE has gaps in its coverage (e.g., certain CMOs, options on futures, non-U.S. futures). We have attempted to gather missing information from the Funds' subadvisers; however, missing security-level risk metrics may result in non-material errors in portfolio-level calculations._x000D_&#10;" noteItem="B.3.b"/>
			<explntrNote note="CS01 measures the change in price for a one basis point change in the Option Adjusted Spread (OAS) of the bond. It is calculated by shifting the bond's OAS up and down one basis point and observing the average change from the starting Input Price, holding the term structure of interest rates and volatility assumptions constant. This indicates the sensitivity of price to a change in the risk premium demanded by the market. CS01 is not computed for most derivatives, except for single-name Credit Default Swaps. Since Treasuries are insensitive to changes in credit spread/risk premiums, a spread duration of zero is assumed. Risk metrics at the security level are provided by a third-party vendor (ICE). As of the current filing, ICE has gaps in its coverage (e.g., certain CMOs, options on futures, non-U.S. futures). We have attempted to gather missing information from the Funds' subadvisers; however, missing security-level risk metrics may result in non-material errors in portfolio-level calculations._x000D_&#10;" noteItem="B.3.c"/>
			<explntrNote note="The market value of securities on loan as calculated by the Lending Agent may differ from the market value of those securities using the fund's approved pricing services. Due to this difference in pricing sources, the aggregate market value of securities on loan for a fund as reported on Form N-PORT may differ from the total value of securities on loan reported in the Notes to Portfolio of Investments in a fund's annual financial statement." noteItem="B.4.a.iii"/>
			<explntrNote note="Beginning in December 2019, the MassMutual Funds began accepting non-cash collateral in the securities lending program. The aggregate value of non-cash collateral reported includes the actual principal amount of that collateral as of the close of business on month-end but the market value is calculated based on the prior day's price." noteItem="B.4.b.ii"/>
			<explntrNote note="Monthly total returns for each share class are calculated by the Funds' Sub-Administrator, State Street Bank. The returns are reported without deducting sales loads and redemption fees." noteItem="B.5.a"/>

			<explntrNote note="TBAs are reported as securities rather than as derivatives." noteItem="C.1.a"/>
			<explntrNote note="Certain derivative investments (e.g., options, futures and swaps), private investments, commercial paper, bank loans, and reverse repurchase agreements do not have a standard industry CUSIP and are assigned a 'dummy' CUSIP number by the Funds' Custodian, State Street Bank. Foreign currency forwards do not have a CUSIP in the Custodian's system." noteItem="C.1.d"/>
			<explntrNote note="Certain derivative investments (e.g., OTC options and swaps), private investments, commercial paper, and reverse repurchase agreements do not have an ISIN, SEDOL, ticker or other industry-recognized identifier. For bank loans, we provide the Bank Loan LNX ID. For foreign currency forwards, we provide the Custodian's trade identification number. For investments for which no standard industry or other identifier is available, we are responding with N/A and a description of 'Additional identifier not available.'" noteItem="C.1.e.iii"/>
			<explntrNote note="Issuer type for certain SLM Student Loan Trust asset-backed securities is reported as USGA (U.S. government agency) even though the security may have been issued by Sallie Mae as a private entity. The third-party vendor (ICE) provides the issuer type classification and is unable at this time to differentiate Sallie Mae securities issued prior to or after termination of the entity's federal charter." noteItem="C.4.b"/>
			<explntrNote note="Country codes tagged as N/A indicate that the security is a cross-border supranational/multinational." noteItem="C.5.a"/>

			<explntrNote note="Restricted securities include any equity or fixed income security acquired in a private offering, or any fixed income security flagged by a third-party vendor as exempt from registration under Rule 144A or Regulation S of the Security Act of 1933." noteItem="C.6"/>

			<explntrNote note="Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Level 1 - Quoted prices (unadjusted) in active markets for identical investments that the Fund can access at the measurement date. Level 1 securities generally include actively traded domestic equity securities and American Depository Receipts, derivatives actively traded on a national securities exchange (such as futures and options), and shares of open-end mutual funds. Level 2 - Other significant observable inputs, including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc. Level 2 securities generally include debt securities such as U.S. Government and agency securities, mortgage-backed and asset-backed securities, municipal obligations, sovereign debt obligations, bank loans, corporate bonds, and securities valued at amortized cost; OTC derivatives such as swaps, options, swaptions, and forward foreign currency exchange contracts; broker-quoted securities; and non-exchange traded equity securities and equity securities traded on foreign exchanges._x000D_&#10;Level 3 - Significant unobservable inputs, including the Funds'/Fund's own assumptions in determining the fair value of investments). Level 3 securities include securities for which prices, spreads, or any other significant inputs are unobservable. Generally, securities whose trading has been suspended or that have been delisted from their primary trading exchange; securities in default or bankruptcy proceedings for which there is no current market quotation; and securities acquired in a non-public offering and for which there is no active market are categorized as Level 3." noteItem="C.8"/>
			<explntrNote note="Perpetual bonds held in the MassMutual Funds reflect a maturity date of 2099-12-31." noteItem="C.9.a"/>
			<explntrNote note="Instruments are classified as Floating when the coupon rate is determined by a formula that includes an index and margin. Other non-fixed coupon types are mapped as Variable. If an instrument has a fixed coupon rate of 0%, the coupon type will be mapped as None. For fixed-to-float instruments, coupon type will be Variable during the fixed period and Floating after the trigger date." noteItem="C.9.b.i"/>
			<explntrNote note="Certain securities flagged as both mandatory convertible and contingent convertible by the third-party vendor are redeemable or become convertible upon occurrence of some condition or event, e.g., default, tax change, or other trigger event. Related convertible data (description of reference instrument, conversion ratio, delta) is reported as N/A because it is unknown when or if the event will occur." noteItem="C.9.f.iii"/>
			<explntrNote note="Certain securities flagged as both mandatory convertible and contingent convertible by the third-party vendor are redeemable or become convertible upon occurrence of some condition or event, e.g., default, tax change, or other trigger event. Related convertible data (description of reference instrument, conversion ratio, delta) is reported as N/A because it is unknown when or if the event will occur." noteItem="C.9.f.iv"/>


			<explntrNote note="Certain currency forward contracts or options on currency forward contracts have been executed by counterparties for currency CNH, China's offshore Yuan traded outside mainland China. Our filing reflects currency code CNY, the Yuan traded within mainland China. Since CNY and CNH both refer to the Chinese currency and CNH is not an option for the filing, we have substituted CNY for CNH, as needed._x000D_&#10;" noteItem="C.11.e.i"/>
			<explntrNote note="Certain currency forward contracts or options on currency forward contracts have been executed by counterparties for currency CNH, China's offshore Yuan traded outside mainland China. Our filing reflects currency code CNY, the Yuan traded within mainland China. Since CNY and CNH both refer to the Chinese currency and CNH is not an option for the filing, we have substituted CNY for CNH, as needed._x000D_&#10;" noteItem="C.11.e.ii"/>
			<explntrNote note="The market value of securities on loan as calculated by the Lending Agent may differ from the market value of those securities using the fund's approved pricing services. Due to this difference in pricing sources, the aggregate market value of securities on loan for a fund as reported on Form N-PORT may differ from the total value of securities on loan reported in the Notes to Portfolio of Investments in a fund's annual financial statement." noteItem="C.12.c"/>
		</explntrNotes>
		<signature>
			<ncom:dateSigned>2020-02-21</ncom:dateSigned>
			<ncom:nameOfApplicant>MASSMUTUAL SELECT FUNDS</ncom:nameOfApplicant>
			<ncom:signature>/s/ Renee Hitchcock</ncom:signature>
			<ncom:signerName>Renee Hitchcock</ncom:signerName>
			<ncom:title>Treasurer and CFO</ncom:title>
		</signature>
	</formData>
	<documents>XXXX</documents>
</edgarSubmission>
