Chinatown is a 1974 American neo-noir mystery film directed by Roman Polanski from a screenplay by Robert Towne. It stars Jack Nicholson and Faye Dunaway in the principal roles, with supporting performances by John Huston, John Hillerman, Perry Lopez, Burt Young, and Diane Ladd. The film's story is inspired by the California water wars: a series of disputes over southern California water at the beginning of the 20th century that resulted in Los Angeles securing water rights in the Owens Valley. The Robert Evans production, released by Paramount Pictures, was Polanski's last film in the United States and features many elements of film noir, particularly a multi-layered story that is part mystery and part psychological drama.

Chinatown was released in the United States on June 20, 1974, to acclaim from critics, with praise for the narrative and screenwriting, Nicholson and Dunaway's performances, cinematography, and Polanski's direction. At the 47th Academy Awards, it was nominated for 11 Oscars, with Towne winning Best Original Screenplay. The Golden Globe Awards honored it for Best Drama, Best Director, Best Actor, and Best Screenplay. The American Film Institute placed it second among the top ten mystery films in 2008. In 1991, the film was selected by the Library of Congress for preservation in the United States National Film Registry as being "culturally, historically or aesthetically significant". It is also often cited as one of the greatest films of all time.

A sequel, The Two Jakes, was released in 1990, again starring Nicholson, who also directed, with Robert Towne returning to write the screenplay. The film failed to match the acclaim of its predecessor.