Legacy of Satan is a 1974 horror film written and directed by Gerard Damiano. It stars John Francis, Lisa Christian, Paul Barry, Deborah Horlen and Sandra Peabody, who respectively portray Dr. Muldavo, Maya, George, the High Priestess, and a cult member. Set in New York, the film revolves around Maya (Christian), a young woman who is chosen to be the queen of a satanic cult, and her descent into madness when her normal life is hindered by a series of evocative dreams. Originally written as a hardcore film, Damiano ultimately decided to rewrite it as a psychological horror film.

Damiano shot the film on a shoestring budget and featured a cast of relatively unknown actors. The film is notable for being the debut film of Christa Helm, an aspiring actress who was murdered three years after the release of this film. Filmed in 1972, the film subsequently had a limited theatrical release in 1973 and became a part of the grindhouse circuit as a double feature to both Tobe Hooper's landmark horror film The Texas Chain Saw Massacre (1974) and Andy Milligan's Blood (1973) from 1974 to 1976. It has been met to generally negative reviews with the score of the film being heavily criticized by critics.