Event Horizon is a 1997 science fiction horror film directed by Paul W. S. Anderson and written by Philip Eisner. It stars Laurence Fishburne, Sam Neill, Kathleen Quinlan and Joely Richardson. Set in 2047, it follows a crew of astronauts sent on a rescue mission after a missing spaceship, the Event Horizon, spontaneously appears in orbit around Neptune, only to discover that a sinister force has come back with it.

The film had a troubled production, with filming and editing rushed by Paramount when it became clear that Titanic would not meet its projected release. The original 130-minute cut of the film was heavily edited by the studio's demand, to Anderson's consternation.

On release, the film was a commercial and critical failure, grossing $42 million on a $60 million production budget. However, it began to sell well on home video; its initial DVD release sold so well that Paramount contacted Anderson to begin working on a restoration of the deleted footage, but it had been either lost or destroyed. In the years since, the film has developed a cult following and is referenced in other works of popular culture.