The Mansion of Madness is a 1973 Mexican horror film directed by Juan López Moctezuma, in his directorial debut, and starring Claudio Brook, Arthur Hansel, Ellen Sherman, and Martin LaSalle. Set in 19th-century France, the film follows a journalist visiting a rural insane asylum in which he uncovers that the inmates have overtaken the doctors and staff, and implemented a series of gruesome treatments. It is loosely based on the Edgar Allan Poe short story "The System of Doctor Tarr and Professor Fether".