Capricorn One is a 1978 British-produced American thriller film in which a reporter discovers that a supposed Mars landing by a crewed mission to the planet has been faked via a conspiracy involving the government and—under duress—the crew themselves. It was written and directed by Peter Hyams and produced by Lew Grade's ITC Entertainment. It stars Elliott Gould as the reporter, and James Brolin, Sam Waterston, and O. J. Simpson as the astronauts. Hal Holbrook plays a senior NASA official who goes along with governmental and corporate interests and helps to fake the mission.

The music score was created by Jerry Goldsmith.