    <SEC-DOCUMENT>0001171843-25-007668-index.html : 20251201
    <SEC-HEADER>0001171843-25-007668.hdr.sgml : 20251201
    <ACCEPTANCE-DATETIME>20251201080014
    ACCESSION NUMBER:		0001171843-25-007668
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20251201
    DATE AS OF CHANGE:		20251201

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NORTHERN TECHNOLOGIES INTERNATIONAL CORP
    		CENTRAL INDEX KEY:			0000875582
    		STANDARD INDUSTRIAL CLASSIFICATION:	COATING, ENGRAVING & ALLIED SERVICES [3470]
    		ORGANIZATION NAME:           	04 Manufacturing
    		EIN:				410857886
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			0831

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-11038
    		FILM NUMBER:		251537174

    	BUSINESS ADDRESS:
    		STREET 1:		4201 WOODLAND ROAD
    		STREET 2:		PO BOX 69
    		CITY:			CIRCLE PINES
    		STATE:			MN
    		ZIP:			55014
    		BUSINESS PHONE:		(763) 225-6601

    	MAIL ADDRESS:
    		STREET 1:		4201 WOODLAND ROAD
    		STREET 2:		PO BOX 69
    		CITY:			CIRCLE PINES
    		STATE:			MN
    		ZIP:			55014

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	NORTHERN INSTRUMENTS CORP
    		DATE OF NAME CHANGE:	19930328
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>defa14a112025.htm
    <DESCRIPTION>FORM DEFA14A
    <TEXT>
    Document 1 - file: defa14a112025.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>proxy_01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: proxy_01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>proxy_02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: proxy_02.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>