Killer Klowns from Outer Space is a 1988 American science fiction horror comedy film written, directed and produced by the Chiodo Brothers, and starring Grant Cramer, Suzanne Snyder, John Allen Nelson and John Vernon. It is the only film written and directed by the Chiodo Brothers, who also created the practical effects and makeup. It concerns a clan of evil extraterrestrials who resemble clowns. They arrive on Earth and invade a small town in order to capture, kill and harvest the human inhabitants to use as sustenance by drinking their blood.

Killer Klowns from Outer Space was filmed in Watsonville, California, and at the Santa Cruz Beach Boardwalk. The film utilizes practical effects, including rubber suits. The score was composed by John Massari. The film received generally positive reviews and has been considered a cult classic.

Sequels have been in development hell since the original film's release. Stephen Chiodo stated in 2016 that he hopes to produce three additional films, or possibly a television series. In 2018, NBCUniversal's Syfy announced that it was in talks to license the rights to make one or more sequels.