The Entity is a 1982 American supernatural horror film directed by Sidney J. Furie, and starring Barbara Hershey, Ron Silver, David Labiosa, Maggie Blye, Jacqueline Brookes, and Alex Rocco. The film follows a single mother in Los Angeles who is raped and tormented by an invisible poltergeist-like entity in her home. It was adapted for the screen by Frank De Felitta from his 1978 novel of the same name, which was based on the 1974 case of Doris Bither, a woman who claimed to have been repeatedly sexually assaulted by an invisible assailant, and who underwent observation by doctoral students at the University of California, Los Angeles.