Jacob "Jack" Kruschen (March 20, 1922 – April 2, 2002) was a Canadian character actor who worked primarily in American film, television and radio. Kruschen was nominated for the Academy Award for Best Supporting Actor for his role as Dr. Dreyfuss in the 1960 comedy-drama The Apartment.

Kruschen began working at a radio station in Los Angeles when he was 16. During World War II, he served in the Army, assigned to the Armed Forces Radio Service (AFRS). Following the war, he resumed working on network programs, including Broadway Is My Beat (as Mugovin, a detective), and Pete Kelly's Blues (as club owner George Lupo),  as well as frequent episodic roles on anthology series, westerns and crime dramas. He also performed on Escape, Dragnet, Gunsmoke (usually as law-abiding locals), Full House, Crime Classics, Frontier Gentleman, Yours Truly, Johnny Dollar, Nightbeat and Suspense.