-----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,
 S59RZcQWsh0OHn5G9gxg+CJbxcHcV+gJf/IhjPGhIeIXskUhjVC1LfjLoBiP5V5I
 VtR1FLvEtH46Ax0L3mikzg==

<SEC-DOCUMENT>0001335389-06-000075.txt : 20060508
<SEC-HEADER>0001335389-06-000075.hdr.sgml : 20060508
<ACCEPTANCE-DATETIME>20060508123044
ACCESSION NUMBER:		0001335389-06-000075
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060301
FILED AS OF DATE:		20060508
DATE AS OF CHANGE:		20060508

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HANCOCK JOHN PATRIOT PREFERRED DIVIDEND FUND
		CENTRAL INDEX KEY:			0000899581
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				043190056
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		C/O JOHN HANCOCK FUNDS
		STREET 2:		601 CONGRESS STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		617-663-3000

	MAIL ADDRESS:	
		STREET 1:		C/O JOHN HANCOCK FUNDS
		STREET 2:		601 CONGRESS STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PATRIOT PREFERRED DIVIDEND FUND
		DATE OF NAME CHANGE:	19930714

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Medina Steven
		CENTRAL INDEX KEY:			0001361987

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-07590
		FILM NUMBER:		06815637

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		617-663-2145

	MAIL ADDRESS:	
		STREET 1:		601 CONGRESS STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-03-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000899581</issuerCik>
        <issuerName>HANCOCK JOHN PATRIOT PREFERRED DIVIDEND FUND</issuerName>
        <issuerTradingSymbol>ppf</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001361987</rptOwnerCik>
            <rptOwnerName>Medina Steven</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>601 CONGRESS STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, the Adviser</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>Steven Medina</signatureName>
        <signatureDate>2006-05-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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