Manhattan is a 1979 romantic comedy film which tells about a divorced forty-something whose ex-wife is writing a tell-all book about their relationship. He is having an affair with a high school girl, and falls for his best friend's girlfriend. It stars Woody Allen, Diane Keaton, Michael Murphy, Mariel Hemingway, Meryl Streep and Anne Byrne.

The movie was written by Allen and Marshall Brickman, and directed by Allen. Allen insisted that this movie be shown in its proper aspect ratio when it was released on video. As a result, all copies of the movie on video are letterboxed.

It was nominated for Academy Awards for Best Actress in a Supporting Role (Mariel Hemingway) and Best Writing, Screenplay Written Directly for the Screen. The film is consistently on the Internet Movie Database's list of top 250 films and was #46 on American Film Institute's 100 Years, 100 Laughs. In 2001 the United States Library of Congress deemed the film "culturally significant" and selected it for preservation in the National Film Registry.