    <SEC-DOCUMENT>0001171843-20-002964-index.html : 20200428
    <SEC-HEADER>0001171843-20-002964.hdr.sgml : 20200428
    <ACCEPTANCE-DATETIME>20200428163016
    ACCESSION NUMBER:		0001171843-20-002964
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		5
    FILED AS OF DATE:		20200428
    DATE AS OF CHANGE:		20200428
    EFFECTIVENESS DATE:		20200428

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			HARVARD BIOSCIENCE INC
    		CENTRAL INDEX KEY:			0001123494
    		STANDARD INDUSTRIAL CLASSIFICATION:	LABORATORY ANALYTICAL INSTRUMENTS [3826]
    		IRS NUMBER:				043306140
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33957
    		FILM NUMBER:		20825510

    	BUSINESS ADDRESS:
    		STREET 1:		84 OCTOBER HILL RD
    		CITY:			HOLLISTON
    		STATE:			MA
    		ZIP:			01746
    		BUSINESS PHONE:		5088938999

    	MAIL ADDRESS:
    		STREET 1:		84 OCTOBER HILL ROAD
    		CITY:			HOLLISTON
    		STATE:			MA
    		ZIP:			01746
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>defa14a_042820.htm
    <DESCRIPTION>DEFINITIVE ADDITIONAL MATERIALS
    <TEXT>
    Document 1 - file: defa14a_042820.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>pcard_1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: pcard_1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>pcard_2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: pcard_2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>pcard_3.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: pcard_3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>pcard_4.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: pcard_4.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>