Dementia 13, known in the United Kingdom as The Haunted and the Hunted, is a 1963 independently made black-and-white horror-thriller film produced by Roger Corman, and written and directed by Francis Ford Coppola in his feature film directorial debut. The film stars William Campbell and Luana Anders with Bart Patton, Mary Mitchell, and Patrick Magee. It was released in the United States by American International Pictures during the fall of 1963 as the bottom half of a double feature with Corman's X: The Man with the X-ray Eyes.

Although Coppola had been involved in at least two sexploitation films previously, Dementia 13 served as his first mainstream "legitimate" directorial effort. Corman offered Coppola the chance to direct a low-budget horror film in Ireland using funds left over from Corman's recently completed The Young Racers, on which Coppola had worked as a sound technician. The producer wanted a cheap Psycho copy, complete with gothic atmosphere and brutal killings, and Coppola quickly wrote a screenplay with Corman's requirements. Although given total directorial freedom during production, Coppola found himself at odds with Corman after completion. The producer declared it unreleasable and demanded several changes.

In 2017, Coppola's company, American Zoetrope, restored the director's cut under the supervision of James T. Mockoski, with editing by Robert Schafer, sound restoration by Jim McKee of Earwax Productions, and color supervision by Chris Martin of Mission Film and Design.