Annie Hall is a 1977 American satirical romantic comedy-drama film directed by Woody Allen from a screenplay written by Allen and Marshall Brickman, and produced by Allen's manager, Charles H. Joffe. The film stars Allen as Alvy Singer, who tries to figure out the reasons for the failure of his relationship with the eponymous female lead, played by Diane Keaton in a role written specifically for her.

Principal photography for the film began on May 19, 1976, on the South Fork of Long Island, and continued periodically for the next ten months. Allen has described the result, which marked his first collaboration with cinematographer Gordon Willis, as "a major turning point", in that, unlike the farces and comedies that were his work to that point, it introduced a new level of seriousness. Academics have noted the contrast in the settings of New York City and Los Angeles, the stereotype of gender differences in sexuality, the presentation of Jewish identity, and the elements of psychoanalysis and modernism.

Annie Hall was screened at the Los Angeles Film Festival on March 27, 1977, before its official release in the United States on April 20, 1977. The film received widespread critical acclaim, and was nominated for the Big Five Academy Awards, winning four: the Academy Award for Best Picture, two for Allen (Best Director and, with Brickman, Best Original Screenplay), and Best Actress for Keaton. The film additionally won four BAFTA Awards, including Best Film, Best Direction (for Allen), Best Screenplay (for both Allen and Brickman) and Best Actress in a Leading Role (for Keaton), in addition to the Golden Globe Award for Best Actress – Motion Picture Comedy or Musical (for Keaton). The film's box office receipts in the United States and Canada of $38,251,425 are fourth-best of Allen's works when not adjusted for inflation.

Regarded among the greatest films ever made, it ranks 31st on AFI's list of the 100 greatest films in American cinema, 4th on their list of the greatest comedy films and 28th on Bravo's "100 Funniest Movies". Film critic Roger Ebert called it "just about everyone's favorite Woody Allen movie". The film's screenplay was also named the funniest ever written by the Writers Guild of America in its list of the "101 Funniest Screenplays". In 1992, the Library of Congress selected the film for preservation in the United States National Film Registry as being "culturally, historically or aesthetically significant". It is also regarded by critics as a landmark "transitional" film in Allen's career, moving his work from more "accessible" and surreal parody towards more "naturalistic" comic filmmaking.