Frank Marion Thomas (July 13, 1889 – November 25, 1989) was an American character actor of stage, screen and television.

Thomas's parents were Jesse and Virginia Thomas. He first appeared on Broadway in 1914. Thomas also played many supporting roles in films from the 1930s through the 1970s. In 1937 alone, he appeared in 21 films. His best-known films were We Who Are About To Die (1937), A Man to Remember (1938), A Shot In the Dark (1941), Desert Trail (1942), and No Place for a Lady (1943). His last screen appearance was in The Killing of a Chinese Bookie (1976).

He performed on television from the 1950s to the 1970s. He was president (Shepherd) of The Lambs (1962–63).^{[citation needed]}

He and his wife, actress Mona Bruns, were the parents of actor Frankie Thomas. He died in 1989 at the age of 100, and is interred next to his wife, who also died at 100, at Forest Lawn Memorial Park, Hollywood, California.

(Per AFI database)