Incubus is a 1981 Canadian supernatural slasher film directed by John Hough and starring John Cassavetes, Kerrie Keane, and John Ireland. The plot focuses on a small Wisconsin town where a mysterious figure is raping and murdering young women. It is based on the 1976 novel of the same name by Ray Russell. The screenplay for the film was originally completed by Sandor Stern, though it was so significantly rewritten by star Cassavetes during production that a pseudonymous "George Franklin" received the official credit as screenwriter.

Principal photography of Incubus took place in Guelph, Ontario in the fall of 1980. Upon its theatrical release in 1982, the film received largely unfavorable reviews, with many citing its plot and overt violence as weaknesses. Despite its critical reception, the film earned approximately $5.6 million at the United States box office.