Martin Mull (born August 18, 1943) is an American actor, comedian and painter from Chicago, best-known for frequent appearances on the television show Hollywood Squares. He is a graduate of the Rhode Island School of Design.

Following a period of stand-up comedy perforances and recordings, his first famous role was as Garth Gimble and Barth Gimble in the television nighttime absurdist soap opera Mary Hartman, Mary Hartman (1976), which led to spin-off comedy talk shows Fernwood 2-Night (1977) and America 2-Night (1978), in which he played Barth Gimble, emcee.

He sometimes had minor roles in major films (My Bodyguard (1980), Take This Job and Shove It (1981), Mr. Mom (1983), Growing Pains (1984), Clue (1985), Mrs. Doubtfire (1993), Jingle All the Way (1996)), and recurring roles on television series (Roseanne, Family Dog , Sabrina, the Teenage Witch, and The Ellen Show ) followed.