Manhattan is a 1979 American romantic comedy film directed by Woody Allen and produced by Charles H. Joffe. The screenplay was written by Allen and Marshall Brickman. Allen co-stars as a twice-divorced 42-year-old comedy writer who dates a 17-year-old girl (Mariel Hemingway) but falls in love with his best friend (Michael Murphy)'s mistress (Diane Keaton). Meryl Streep and Anne Byrne also star.

Manhattan was filmed in black-and-white and 2.35:1 widescreen. It features music by George Gershwin, including Rhapsody in Blue, which inspired the film. Allen described the film as a combination of Annie Hall and Interiors.

The film received critical acclaim and was nominated for the Academy Award for Best Supporting Actress for Hemingway and Best Writing, Screenplay Written Directly for the Screen for Allen and Brickman. Its North American box-office receipts of $39.9 million made it Allen's second biggest box-office hit (adjusting for inflation). Often considered one of his best films, it ranks 46th on AFI's 100 Years...100 Laughs list and number 63 on Bravo's "100 Funniest Movies".  In 2001 the United States Library of Congress deemed the film "culturally significant" and selected it for preservation in the National Film Registry.