- CAK stands for Akron-Canton Airport (airport code; Ohio)
- CAK stands for CDk Activating Kinase
- CAK stands for Centraal Administratie Kantoor (Dutch organisation for financing of special health care costs and institutions)
- CAK stands for Controlled-Atmosphere Killing (animal slaughter method)
- CAK stands for Christian Academy of Knoxville
- CAK stands for Center for Afrikansk Kulturformidling (Norwegian: Center for African Culture)
- CAK stands for Akron/Canton, OH, USA – Akron-Canton Regional Airport (Airport Code)
- CAK stands for Centra Aplikované Kybernetiky (Czech: Center for Applied Cybernetics)
- CAK stands for Card Authentication Key (electronic security)
- CAK stands for Cardiology Associates of Kentucky (Lexington, KY)
- CAK stands for Centre Angevin de Karaté Do (French martial arts school)
- CAK stands for Carcinome Adénoïde Kystique (French: Adenoid Cystic Carcinoma)
- CAK stands for Christopher Allen Kirkpatrick (NSYNC)
- CAK stands for Concept Assessment Kit (educational tool)
- CAK stands for Club d’Astronomie de Kintzheim (French: Kintzheim Astronomy Club; Kintzheim, France)
CAK