Martin Mull (born August 18, 1943) is an American actor who has appeared in many television and film roles. He is also a comedian, painter, and recording artist. As an actor, he first became known in his role on Mary Hartman, Mary Hartman and its spin-off Fernwood 2 Night. Among his other notable roles are Colonel Mustard in the 1985 film Clue, Leon Carp on Roseanne, and Willard Kraft on Sabrina, the Teenage Witch.
Mull has been a painter since the 1970s, and has had his work appear in group and solo exhibits throughout that time. He participated in the June 15, 1971 exhibit "Flush with the Walls" in the men's room of the Boston Museum of Art to protest the lack of contemporary and local art in the museum. His work often combines photorealist painting, and the pop art and collage styles. He published a book of some of his paintings, entitled Paintings Drawings and Words, in 1995. One of his paintings was used on the cover for the 2008 Joyce Carol Oates novel My Sister, My Love. Another painting, owned by Steve Martin titled After Dinner Drinks (2008), was used for the cover of Love Has Come For You, an album by Steve Martin and Edie Brickell.