-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 RCuNQvqoFI6vWxGHTlnJRhYDl+8ZLmbNA3k+MxNX3xjK3uoMuYKZ/wW8IN9yz5B1
 XUQ33tKnXYibQ76T2AtoNA==

<SEC-DOCUMENT>0000831655-08-000007.txt : 20080730
<SEC-HEADER>0000831655-08-000007.hdr.sgml : 20080730
<ACCEPTANCE-DATETIME>20080730085957
ACCESSION NUMBER:		0000831655-08-000007
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20080722
FILED AS OF DATE:		20080730
DATE AS OF CHANGE:		20080730

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Florence Dan
		CENTRAL INDEX KEY:			0001441347

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05531
		FILM NUMBER:		08977408

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		413-226-1527

	MAIL ADDRESS:	
		STREET 1:		1500 MAIN STREET P.O. BOX 15189
		STREET 2:		BABSON CAPITAL MANAGEMENT LLC
		CITY:			SPRINGFIELD
		STATE:			MA
		ZIP:			01115

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
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>flo56.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2008-07-22</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441347</rptOwnerCik>
            <rptOwnerName>Florence Dan</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>BABSON CAPITAL MANAGEMENT LLC</rptOwnerStreet1>
            <rptOwnerStreet2>1500 MAIN STREET</rptOwnerStreet2>
            <rptOwnerCity>SPRINGFIELD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01115</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Treasurer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>By: Ann Malloy as Attorney-in-fact for</signatureName>
        <signatureDate>2008-07-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>florence2008.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 Treasurer of MassMutual Corporate Investors and
MassMutual Participation Investors (each, a "Trust"), hereby appoint and
designate 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:                                     July 28, 2008
                 -------------------------------------------------------------
Name:    Dan Florence
Title:   Treasurer of MassMutual Corporate Investor and MassMutual
         Participation Investors











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