Caligula (Italian: Caligola) is a 1979 erotic historical drama film about the rise and fall of controversial Roman Emperor Caligula. The film stars Malcolm McDowell in the title role, alongside Teresa Ann Savoy, Helen Mirren, Peter O'Toole, John Steiner, and John Gielgud.

Original screenwriter Gore Vidal and film director Tinto Brass both disavowed the extensive changes to their contributions, with Brass dismissed prior to editing. Financier producer Bob Guccione, founder of Penthouse magazine, engaged Giancarlo Lui to film post-production scenes featuring hardcore sex, significantly altering the film's tone and style.

Initially released to Italian cinemas in 1979, then screened in America the following year, Caligula was met with legal issues and controversies over its violent and sexual content. Different abridged versions were released worldwide, while its uncut form remains banned in several countries. Despite a generally negative reception, the film has gained notoriety as a cult classic with significant merit for its political content and historical portrayal. A 178-minute Ultimate Cut, approved by McDowell and containing new footage not included in the theatrical release, premiered at the Cannes Film Festival in 2023, receiving more favorable reviews from critics.