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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001244657-08-000010.txt : 20080219
<SEC-HEADER>0001244657-08-000010.hdr.sgml : 20080218
<ACCEPTANCE-DATETIME>20080219144619
ACCESSION NUMBER:		0001244657-08-000010
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20080211
FILED AS OF DATE:		20080219
DATE AS OF CHANGE:		20080219

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MASSMUTUAL PARTICIPATION INVESTORS
		CENTRAL INDEX KEY:			0000831655
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				043025730
		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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MASSMUTUAL CORPORATE INVESTORS II
		DATE OF NAME CHANGE:	19880417

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BENSON DONALD E
		CENTRAL INDEX KEY:			0001244657

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05531
		FILM NUMBER:		08626190

	BUSINESS ADDRESS:	
		STREET 1:		60 SOUTH SIXTH ST STE 3800
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402

	MAIL ADDRESS:	
		STREET 1:		60 SOUTH SIXTH ST STE 3800
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55450
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>ben51.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-02-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000831655</issuerCik>
        <issuerName>MASSMUTUAL PARTICIPATION INVESTORS</issuerName>
        <issuerTradingSymbol>MPV</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001244657</rptOwnerCik>
            <rptOwnerName>BENSON DONALD E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>MARQUETTE FINANCIAL COMPANIES</rptOwnerStreet1>
            <rptOwnerStreet2>60 SOUTH SIXTH STREET, SUITE 3800</rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>TRUSTEE MMPI</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2008-02-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>8222.08</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Sale amount includes shares acquired through dividend reinvestment plan not previously reported since last Form 4 filing pursuant to Rule 16a-11 under the Securities Exchange Act of 1934, as amended.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>By: Sara C. Stinson  as Attorney-in-fact for</signatureName>
        <signatureDate>2008-02-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>benson.txt
<TEXT>







SEC Form 3, Form 4 and Form 5 and Application for EDGAR Access
(Form ID) Confirmation of Authority to Sign

Pursuant to Instruction 7 to SEC "Form 3 - Initial Statement
of Beneficial Ownership of Security," "Form 4--Statement of
Changes in Beneficial Ownership" and "Form 5 - Annual Statement
of Beneficial Ownership of Securities" the undersigned, being a
Trustee of MassMutual Corporate Investors and MassMutual
Participation Investors (each, a "Trust"), hereby appoint and
designate Sara Stinson, Mark Godin, Melissa Busso, Ruth Howe,
Ann Malloy and Melissa LaGrant and each of them singly, my true
and lawful power of attorney with full power to (a) apply for
access to the EDGAR filing system in my name and (b) sign for
me and file with the Securities and Exchange Commission, the
New York Stock Exchange and the Trust said SEC Forms 3 4 and/or
5 with respect to shares of the Trust purchased or sold by the
undersigned or any other change of beneficial ownership relating
to equity or derivative securities of the Trust required to be
reported by the undersigned.

This authorization shall remain in effect until a written
revocation is executed by the undersigned and filed with the
Securities and Exchange Commission.



Signature and Date:                      October 18, 2007
                 -----------------------------------------

Name:    Donald E. Benson
Title:   Trustee of MassMutual Corporate Investors
         and MassMutual Participation Investors


















</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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