Maniac (also known as Sex Maniac) is a 1934 American black-and-white exploitation horror film directed by Dwain Esper and written by Hildagarde Stadie, Esper's wife, as a loose adaptation of the 1843 Edgar Allan Poe story "The Black Cat", with references to his "Murders in the Rue Morgue". Esper and Stadie also made the 1936 exploitation film Marihuana.

The film, which was advertised with the tagline "He menaced women with his weird desires!", is in the public domain.

A restored version was made available in 1999, as part of a double feature with another Esper film, Narcotic! (1933). John Wilson, the founder of the Golden Raspberry Award, named Maniac one of the "100 Most Amusingly Bad Movies Ever Made" in his book The Official Razzie Movie Guide. Maniac has received negative reception since its release, being the first film considered the worst ever made and is an oft-cited example of pornographic films.