The Greatest is a 1977 biographical sports film about the life of boxer Muhammad Ali, in which Ali plays himself. It was directed by Tom Gries. The film follows Ali's life from the 1960 Summer Olympics to his regaining the heavyweight crown from George Foreman in their famous "Rumble in the Jungle" fight in 1974. The film consists largely of archival footage of Ali's boxing matches used in the screenplay.

A biographical film or biopic is a film that dramatizes the life of an actual person or group of people. Such films show the life of a historical person and the central character's real name is used. They differ from docudrama films and historical drama films in that they attempt to comprehensively tell a single person's life story or at least the most historically important years of their lives.