Parts: The Clonus Horror (also known as The Clonus Horror, or simply Clonus) is a 1979 science fiction horror film directed, co-written and produced by Robert S. Fiveson, and starring Peter Graves, Tim Donnelly, Dick Sargent, Keenan Wynn, Paulette Breen and Frank Ashmore. The film is about an isolated desert community where clones are bred to serve as a source of replacement organs for the wealthy and powerful.

An independent production, Parts was released in the United States in August 1979. It was nominated at the 7th Saturn Awards for "Best Film Produced for Under $1,000,000". It gained further recognition after being featured on the comedy television series Mystery Science Theater 3000 in 1997.

In 2005, the filmmakers filed a lawsuit against DreamWorks Pictures for copyright infringement, citing numerous similarities between Clonus and the Michael Bay film The Island. The two parties reached a seven-figure settlement, the terms of which were sealed by the court.