Superman III is a 1983 superhero film directed by Richard Lester from a screenplay by David Newman and Leslie Newman based on the DC Comics character Superman. It is the third installment in the Superman film series and the sequel to Superman II (1980). The film stars Christopher Reeve, Richard Pryor, Jackie Cooper, Marc McClure, Annette O'Toole, Annie Ross, Pamela Stephenson, Robert Vaughn, and Margot Kidder. In the film, Superman battles a corrupt businessman who has constructed a powerful supercomputer to kill him.

Superman III was released in the United States on June 17, 1983. The film proved less successful than its predecessors, both critically and financially, grossing $80.2 million worldwide. A sequel, Superman IV: The Quest for Peace, was released in 1987.