Incubus is a supernatural horror novel by American writer Ray Russell, first published by William Morrow and Company in 1976. Its plot follows a small California community that is plagued by a series of brutal rapes and murders that are discovered to be supernatural in origin.
It is the basis of the 1981 film of the same name directed by John Hough and starring John Cassavetes.
William Morrow and Company first published Incubus on January 6, 1976. It was re-printed by Dell Books in 1977 in paperback format, with later subsequent reprinting through 1981. Dell also published a paperback edition under the title The Incubus featuring the film adaptation's American poster artwork (in the United States, the film was released under this slightly extended title).
Will Errickson, writing about the novel for Reactor magazine in 2014, commented on its implicit sexual politics and explicit sexual themes, noting:
Filmmaker John Hough directed a 1981 film of the same name, based on a screenplay by Sandor Stern and starring John Cassavetes.