Superman (also marketed as Superman: The Movie) is a 1978 superhero film based on DC Comics featuring the eponymous character, played by Christopher Reeve. It is the first of four installments in the Superman film series starring Reeve as Superman. The film was directed by Richard Donner based on a screenplay by Mario Puzo, David Newman, Leslie Newman, and Robert Benton. The film features an ensemble cast including Marlon Brando, Gene Hackman, Jeff East, Margot Kidder, Glenn Ford, Phyllis Thaxter, Jackie Cooper, Trevor Howard, Marc McClure, Terence Stamp, Valerie Perrine, Ned Beatty, Jack O'Halloran, Maria Schell, and Sarah Douglas. It depicts the origin of Superman, including his infancy as Kal-El of Krypton, son of Jor-El (Brando), and his youthful years in the rural town of Smallville. Disguised as reporter Clark Kent, he adopts a mild-mannered disposition in Metropolis and develops a romance with Lois Lane (Kidder) while battling the villainous Lex Luthor (Hackman).

Ilya Salkind had the idea of a Superman film in 1973 and, after a difficult process with DC Comics, the Salkinds bought the rights to the character the following year. Several directors, most notably Guy Hamilton, and screenwriters were associated with the project before Donner was hired to direct. Tom Mankiewicz was drafted in to rewrite the script and was given a creative consultant credit. It was decided to film both Superman and its sequel Superman II (1980) simultaneously, with principal photography beginning in March 1977 and ending in October 1978. Tensions arose between Donner and the producers, and a decision was made to stop filming the sequel, of which 75 percent had already been completed, and finish the first film.

The most expensive film made up to that point, with a budget of $55 million, Superman premiered at The Kennedy Center in Washington, DC, on December 10, 1978, and was released in the United Kingdom on December 14, and in the United States on December 15. The film was a critical and financial success; its worldwide box office earnings of $300 million made it the second-highest-grossing release of the year. It received praise for Reeve's performance and John Williams's musical score, and was nominated for Best Film Editing, Best Music (Original Score), and Best Sound at the 51st Academy Awards, and received a Special Achievement Academy Award for Visual Effects. Groundbreaking in its use of special effects and science fiction/fantasy storytelling, the film's legacy presaged the mainstream popularity of Hollywood's superhero film franchises. In 2017, Superman was selected for preservation by the Library of Congress's National Film Registry.