The three-letter acronym MTK may refer to the following:
- Mississippi Thunder Kings a competitive minor hockey association, in Ontario Canada for the towns of Carleton Place, Almonte, Pakenham and surrounding areas.
- Michael, Thomas and Karen, is the name of the sons and daughter of the founder of MTK Electronics, Inc. Located in Medford, NY USA.
- MediaTek Inc. - a Taiwanese designer of chip sets for Navigation, Wireless and other Consumer Electronics equipment.
- MTK - a special set of NMEA commands for GPS chips from MediaTek Inc.
- MTK Hungária FC
- Main-Taunus-Kreis
- Montauk - town in New York
- Mount Kisco - town in New York
- Międzynarodowe Targi Katowickie - Katowice International Fair
- Mediengruppe Telekommander - a German band
- Maa- ja metsätaloustuottajain Keskusliitto MTK r.y. - Finnish Central Union of Agricultural Producers and Forest Owners