Martin Landau (born June 20, 1928) is an American actor.

Landau began his career in the 1950s; his early films include a supporting role in Alfred Hitchcock's North by Northwest (1959). He played continuing roles in the television series Mission: Impossible for which he received Emmy Award nominations, and Space:1999. He received a Golden Globe Award for Best Supporting Actor - Motion Picture and his first nomination for an Academy Award for Best Supporting Actor for his work in Tucker: The Man and His Dream, and was also Oscar nominated for his role in Crimes and Misdemeanors (1989). His performance in the supporting role of Bela Lugosi in Ed Wood (1994) earned him the Academy Award, Screen Actors Guild Award and a Golden Globe. He continues to perform in film and television and heads the Hollywood branch of the Actors Studio.

Landau was born into a Jewish-American family in Brooklyn, New York, the son of Selma (née Buchanan) and Morris Landau, an Austrian-born machinist who scrambled to rescue relatives from the Nazis.