Gavin Muir (September 8, 1900 – May 24, 1972) was an American film, television, and theatre actor.
Muir's mother was American, and his father was Scottish. Although he was born in Chicago, he was educated in England at the University College School.
Muir's career included acting on Broadway through 1933. His first film appearance was in 1932 in a short film, then in John Ford's Mary of Scotland in 1936. His film career continued through 1965, often in character roles, and with a sort of specialty in villains with British accents.