Samuel Joel “Zero” Mostel (February 28, 1915 – September 8, 1977) was an American actor and comedian of stage and screen.

Mostel is best known for his portrayal of comic characters such as Tevye on stage in Fiddler on the Roof, Pseudolus on stage and on screen in A Funny Thing Happened on the Way to the Forum, and Max Bialystock in the original film version of The Producers. Mostel was a student of Don Richardson, using an acting technique based on muscle memory. He was blacklisted during the 1950s, and his testimony before the House Committee on Un-American Activities was well-publicized. He was a Tony Award and Obie Award winner.