Deranged (also known as Deranged: Confessions of a Necrophile) is a 1974 psychological horror film directed by Alan Ormsby and Jeff Gillen, and starring Roberts Blossom. Its plot, loosely based on the crimes of Ed Gein, follows Ezra Cobb, a middle-aged man in a rural Midwestern community who begins a string of serial murders and grave robberies after the death of his mother, a religious fanatic who raised him to be a misogynist. The film features a diegetic narration in which a newspaper columnist occasionally appears and narrates the events depicted. Though based on Gein, the film's title is misleading since Gein never experimented with necrophilia (although a necrophile is also defined as having "an obsessive fascination with death and corpses.")

Funded by an American concert promoter on a small budget, the production took place in Oshawa, Ontario in the winter of 1973, with a largely Canadian cast and crew. The film premiered in Los Angeles on March 20, 1974.

Deranged had disappeared since its release in 1974; however, it was rediscovered in Florida in the mid-1990s and was released into home video by distributor America International Pictures’ parent company Metro Goldwyn Mayer.