Superman IV: The Quest for Peace is a 1987 superhero film directed by Sidney J. Furie and written by Lawrence Konner and Mark Rosenthal from a story by Christopher Reeve, Konner, and Rosenthal based on the DC Comics character Superman. The film stars Reeve, Gene Hackman, Jackie Cooper, Marc McClure, Jon Cryer, Sam Wanamaker, Jim Broadbent, Mariel Hemingway, and Margot Kidder.

It is the fifth film (including Supergirl) in the Superman film series and a sequel to Superman III (1983). It is the first film in the series not to have the involvement of producers Alexander and Ilya Salkind. The film also marks the final appearance of Reeve as Superman, who agreed to return in exchange for a large salary and some creative control, where he contributed to a script dealing with nuclear disarmament.

Shortly before the film's production, the film's producer, The Cannon Group, suffered a major financial crisis that forced major budget cuts, and 45 minutes of footage were deleted after negative test screenings. The film received overwhelmingly negative reviews from critics and fans, citing plot holes and poor special effects. Plans for Superman V were cancelled, and no Superman films were released until Superman Returns in 2006.