Martin (also known internationally as Wampyr) is a 1977 American horror film written and directed by George A. Romero, and starring John Amplas. Its plot follows a troubled young man who believes himself to be a vampire with ambiguous legitimacy. Shot in 1976, Martin was Romero's fifth feature film and followed The Crazies (1973).

Romero said that Martin was the favorite of all his films. The film is also the first collaboration between George Romero and special effects artist Tom Savini. While a prosecution for obscenity did not result, the film was seized and confiscated in the UK under Section 3 of the Obscene Publications Act 1959 during the video nasty panic.