-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 GcGepQTHAZbMEqAaAKaGpmJI6MAXJhenYZbrpymp/qenIsrlUgcPvSwJT5sSne/t
 cy3BWLaByYlM+iiz7GuMVQ==

<SEC-DOCUMENT>0001418829-07-000002.txt : 20071119
<SEC-HEADER>0001418829-07-000002.hdr.sgml : 20071119
<ACCEPTANCE-DATETIME>20071119171443
ACCESSION NUMBER:		0001418829-07-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071115
FILED AS OF DATE:		20071119
DATE AS OF CHANGE:		20071119

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MASSMUTUAL CORPORATE INVESTORS
		CENTRAL INDEX KEY:			0000275694
		IRS NUMBER:				042483041
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1500 MAIN STREET
		STREET 2:		SUITE 600
		CITY:			SPRINGFIELD
		STATE:			MA
		ZIP:			01115
		BUSINESS PHONE:		4132261000

	MAIL ADDRESS:	
		STREET 1:		1500 MAIN STREET
		STREET 2:		SUITE 600
		CITY:			SPRINGFIELD
		STATE:			MA
		ZIP:			01115

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MASSACHUSETTS MUTUAL LIFE INSURANCE CO
		CENTRAL INDEX KEY:			0000225602
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-02183
		FILM NUMBER:		071257361

	BUSINESS ADDRESS:	
		STREET 1:		1295 STATE ST B050
		CITY:			SPRINGFIELD
		STATE:			MA
		ZIP:			01111
		BUSINESS PHONE:		4137448411
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>mas325.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-11-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000275694</issuerCik>
        <issuerName>MASSMUTUAL CORPORATE INVESTORS</issuerName>
        <issuerTradingSymbol>MCI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000225602</rptOwnerCik>
            <rptOwnerName>MASSACHUSETTS MUTUAL LIFE INSURANCE CO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1295 STATE STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SPRINGFIELD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>0111</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Sec 30(h) 10% Debt Holder</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Senior Fixed Rate Convertible Note due 11/15/2017</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-11-15</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2007-11-15</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>980071.87</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>30000000.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>MMCI</value>
                    <footnoteId id="F5"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>980071.87</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>980071.87</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Market</footnote>
        <footnote id="F2">On November 15, 2007, MassMutual Corporate Investors (the ?Trust?) issued to Massachusetts Mutual Life Insurance Company (?MassMutual?) an amended and restated Senior Fixed Rate Convertible Note (the &quot;Note&quot;) in the principal amount of $30,000,000 and due on November 15, 2017.  MassMutual, at its option, can convert the principal amount of the Note into the Trust?s common shares. The dollar amount of principal would be converted into an equivalent dollar amount of the Trust?s common shares based upon the average price of the common shares for ten business days prior to MassMutual?s notice of conversion. The Note replaced the Trust?s $20,000,000 Senior Convertible Fixed Rate Note held by MassMutual. Babson Capital Management LLC, the Trust?s investment adviser, and Cornerstone Real Estate Advisers LLC (?Cornerstone?) are both wholly-owned indirect subsidiaries of MassMutual.  As of November 15, 2007, Cornerstone was the beneficial owner of 27,009 shares of the Trust?s common
 stock.</footnote>
        <footnote id="F3">N/A</footnote>
        <footnote id="F4">11/15/2017</footnote>
        <footnote id="F5">Issuer's Common</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>By: Richard F. Buckley, Jr.  Vice President &amp; Assistant General Counsel</signatureName>
        <signatureDate>2007-11-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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