-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Uz84JSt5Zje7MCbcTosyQqiK4N1C99cu1f6S6VPegVcAMtFKWqXD/ikHxPJOd6Fy
 YK+jU1ef7P1BcIb2mObhhQ==

<SEC-DOCUMENT>0000831655-05-000003.txt : 20050722
<SEC-HEADER>0000831655-05-000003.hdr.sgml : 20050722
<ACCEPTANCE-DATETIME>20050722153535
ACCESSION NUMBER:		0000831655-05-000003
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:			Grant Laura
		CENTRAL INDEX KEY:			0001333310

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05531
		FILM NUMBER:		05968704

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		413-226-1505

	MAIL ADDRESS:	
		STREET 1:		1500 MAIN STREET
		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>gra8.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>0001333310</rptOwnerCik>
            <rptOwnerName>Grant Laura</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: 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>lauragrant.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 the Treasurer 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/Laura Grant   July 15, 2005
                           -------------------------------------------------

Name:    Laura Grant
Title:   Treasurer, MassMutual Corporate Investors and MassMutual
Participation Investors.


















</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
