Manhattan is a 1979 American romantic comedy-drama film directed by Woody Allen and produced by Charles H. Joffe from a screenplay 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's (Michael Murphy) mistress (Diane Keaton). Meryl Streep and Anne Byrne also star.

Manhattan was Allen's first film in black-and-white, and was shot in 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.

Upon its release in April 1979 by United Artists, Manhattan received critical acclaim and was nominated for the Academy Award for Best Supporting Actress for Hemingway and Best Original Screenplay for Allen and Brickman. Its North American box-office receipts of $39.9 million made it Allen's second biggest box-office success (adjusted for inflation). 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, historically, or aesthetically significant" and selected it for preservation in the National Film Registry.