-----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,
 APW30Kzdb2aRj5dNHS9tFnnjVGQ6VkUhb79eJF8kla2ax5sbrGnbOWbYK85xowsV
 OxNCsGpv7d1Z0To9X4L9SA==

<SEC-DOCUMENT>0001179110-05-009085.txt : 20050506
<SEC-HEADER>0001179110-05-009085.hdr.sgml : 20050506
<ACCEPTANCE-DATETIME>20050506111740
ACCESSION NUMBER:		0001179110-05-009085
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040809
FILED AS OF DATE:		20050506
DATE AS OF CHANGE:		20050506

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALPHA PRO TECH LTD
		CENTRAL INDEX KEY:			0000884269
		STANDARD INDUSTRIAL CLASSIFICATION:	ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES [3842]
		IRS NUMBER:				631030494
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		60 CENTURIAN DR
		STREET 2:		SUITE 112
		CITY:			MARKHAM ONTARIO CANA
		STATE:			A6
		BUSINESS PHONE:		9054790654

	MAIL ADDRESS:	
		STREET 1:		60 CENTURION DR
		STREET 2:		STE 112
		CITY:			MARKHAM ON
		STATE:			A6

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BFD INDUSTRIES INC
		DATE OF NAME CHANGE:	19930328

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ANDERSON DAVID B
		CENTRAL INDEX KEY:			0001306140

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15725
		FILM NUMBER:		05806014

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		905-479-0654

	MAIL ADDRESS:	
		STREET 1:		60 CENTURIAN DRIVE SUITE # 112
		CITY:			MARKHAM
		STATE:			A6
		ZIP:			L3R 9R2
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4/A -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2004-08-09</periodOfReport>

    <dateOfOriginalSubmission>2004-12-23</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000884269</issuerCik>
        <issuerName>ALPHA PRO TECH LTD</issuerName>
        <issuerTradingSymbol>APT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001306140</rptOwnerCik>
            <rptOwnerName>ANDERSON DAVID B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>60 CENTURIAN DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 112</rptOwnerStreet2>
            <rptOwnerCity>MARKHAM</rptOwnerCity>
            <rptOwnerState>A6</rptOwnerState>
            <rptOwnerZipCode>L3R 9R2</rptOwnerZipCode>
            <rptOwnerStateDescription>ONTARIO, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.58</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-08-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.58</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2005-08-09</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-08-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>25000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>Sheldon Hoffman, by power of attorney</signatureName>
        <signatureDate>2005-05-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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