Marathon Man is a 1976 American thriller film directed by John Schlesinger. It was adapted by William Goldman from his 1974 novel of the same title and stars Dustin Hoffman, Laurence Olivier, Roy Scheider, William Devane and Marthe Keller. In the film, "Babe" Levy, a graduate student, becomes embroiled in a plot by Nazi war criminal Christian Szell to retrieve ill-gotten diamonds from a safe deposit box owned by Szell's dead brother. Babe becomes unwittingly involved due to his brother Doc's dealings with Szell.

John Richard Schlesinger was an English film and stage director, and actor. He emerged in the early 1960s as a leading light of the British New Wave, before embarking on a successful career in Hollywood, often directing films dealing frankly in provocative subject matter, combined with his status as one of the rare openly gay directors working in mainstream films.