Behind the Green Door is a 1972 American pornographic film, widely considered one of the genre's "classic" pictures and one of the films that ushered in the Golden Age of Porn (1969–1984). Featuring Marilyn Chambers, who became a mainstream celebrity, it was one of the first hardcore films widely released in the United States and the feature-length directorial debut of the Mitchell brothers.

Plot

The manager of a diner asks two of his regular customers to tell him a supposedly true story that they had previously mentioned to him, involving a "green door". The rest of the movie appears to be a dramatization of the story's events, although no off-screen narration is heard.