Warrior of the Lost World (also known as Mad Rider) is a 1983 Italian post-apocalyptic science fiction film written and directed by David Worth and starring Robert Ginty, Persis Khambatta, and Donald Pleasence. It was created and first released in Italy under the title Il Giustiziere della terra perduta ("Vigilante of the Lost Earth") in 1983 during the wide popularity of the Mad Max films, and many subsequently created post-apocalyptic films of the 1980s. Later the film was given another Italian title for VHS and television markets, I predatori dell'anno Omega ("Raiders of the Omega year").

An anonymous warrior (Robert Ginty) on a supersonic cycle saves a girl (Persis Khambatta) and her father from a future tyrant (Donald Pleasence).

The film was on the show Mystery Science Theater 3000, episode 501.