-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 O9z9c0tY/KPZGz8Z0HU5TmzEsXVGjvgdwP/+9TINJJRgbVvz/s/50LqtfX8/KwZD
 9G3428/xhD6lOqSz55NO+w==

<SEC-DOCUMENT>0000831655-05-000002.txt : 20050722
<SEC-HEADER>0000831655-05-000002.hdr.sgml : 20050722
<ACCEPTANCE-DATETIME>20050722153532
ACCESSION NUMBER:		0000831655-05-000002
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20050715
FILED AS OF DATE:		20050722
DATE AS OF CHANGE:		20050722

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Brown Michael Harlan
		CENTRAL INDEX KEY:			0001333406

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05531
		FILM NUMBER:		05968703

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		914-523-7748

	MAIL ADDRESS:	
		STREET 1:		210 TRINITY PASS
		CITY:			POUND RIDGE
		STATE:			NY
		ZIP:			10576

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>bro9.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-07-15</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333406</rptOwnerCik>
            <rptOwnerName>Brown Michael Harlan</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>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>By: Mark Godin as Attorney-in-fact for</signatureName>
        <signatureDate>2005-07-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>michaelbrownpoa.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 (i)
Rosemary Baker (ii) Kelly Schetzel and (iii) Mark Godin, 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:        S/Michael Harlan Brown     July 15, 2005
                           ----------------------------------

Name: Michael Harlan Brown
Title:Trustee, MassMutual Corporate Investors and MassMutual Participation
Investors.


















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