The Cinema Audio Society (CAS) is the largest single group of Sound Professionals in the motion picture and television industry.

Combining talent from IATSE Locals 695 and 700, the membership includes Sound Mixers in Production, as well as mixers who specialize in Music Scoring, Video Post Sweetening, A.D.R. and Foley. Associate Members include Sound Editors, Technicians, Recordists, and Microphone Boom Operators.