-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FT5Y2si6veCZm6Fd+KtIA+gL99z1Al5jxoYiGXBI48jbb+BT16Txt+kO6Vv7RgPP
 ywm6EnI1698PsYPcCTjU+w==

<SEC-DOCUMENT>0001415913-07-000009.txt : 20071025
<SEC-HEADER>0001415913-07-000009.hdr.sgml : 20071025
<ACCEPTANCE-DATETIME>20071025122425
ACCESSION NUMBER:		0001415913-07-000009
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20071019
FILED AS OF DATE:		20071025
DATE AS OF CHANGE:		20071025

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:			Syracuse Maleyne M.
		CENTRAL INDEX KEY:			0001415913

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05531
		FILM NUMBER:		071190194

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		917 859 5955

	MAIL ADDRESS:	
		STREET 1:		3 HANOVER SQUARE
		STREET 2:		APT. 13D
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10004
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>syr43.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-10-19</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001415913</rptOwnerCik>
            <rptOwnerName>Syracuse Maleyne M.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1500 MAIN STREET</rptOwnerStreet1>
            <rptOwnerStreet2>P O BOX 15189</rptOwnerStreet2>
            <rptOwnerCity>SPRINGFIELD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01115</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Trustee</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>By: Sara C. Stinson  as Attorney-in-fact for</signatureName>
        <signatureDate>2007-10-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>syracuse.txt
<DESCRIPTION>POA
<TEXT>
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 19, 2007
                 -------------------------------------------------------------

Name:    Maleyne M. Syracuse
Title:   Trustee of MassMutual Corporate Investors and
         MassMutual Participation Investors




















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