    <SEC-DOCUMENT>0000921895-20-001024-index.html : 20200406
    <SEC-HEADER>0000921895-20-001024.hdr.sgml : 20200406
    <ACCEPTANCE-DATETIME>20200406170258
    ACCESSION NUMBER:		0000921895-20-001024
    CONFORMED SUBMISSION TYPE:	SC 13D/A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20200406
    DATE AS OF CHANGE:		20200406

    SUBJECT COMPANY:

    	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:		SC 13D/A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	005-60603
    		FILM NUMBER:		20777636

    	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

    FILED BY:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ENGINE CAPITAL, L.P.
    		CENTRAL INDEX KEY:			0001580320
    		IRS NUMBER:				364755478
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		SC 13D/A

    	BUSINESS ADDRESS:
    		STREET 1:		1370 BROADWAY
    		STREET 2:		5TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10018
    		BUSINESS PHONE:		(212) 321-0048

    	MAIL ADDRESS:
    		STREET 1:		1370 BROADWAY
    		STREET 2:		5TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10018

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Engine Capital Management, L.P.
    		DATE OF NAME CHANGE:	20180628

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Engine Capital, L.P.
    		DATE OF NAME CHANGE:	20130628
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>SC 13D/A
    <SEQUENCE>1
    <FILENAME>sc13da209488031_04062020.htm
    <TEXT>
    Document 1 - file: sc13da209488031_04062020.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>ex991to13da209488031_040620.htm
    <TEXT>
    Document 2 - file: ex991to13da209488031_040620.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>SC 13D/A
    <SEQUENCE>3
    <FILENAME>ex992to13da209488031_040620.pdf
    <DESCRIPTION>EXHIBIT 99.2 - LETTER TO ISSUER
    <TEXT>
    Document 3 - file: ex992to13da209488031_040620.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>