The Iron Giant is a 1999 American animated science fiction film produced by Warner Bros. Feature Animation and directed by Brad Bird in his directorial debut. It is based on the 1968 novel The Iron Man by Ted Hughes (which was published in the United States as The Iron Giant) and was scripted by Tim McCanlies from a story treatment by Bird. The film stars the voices of Jennifer Aniston, Harry Connick Jr., Vin Diesel, James Gammon, Cloris Leachman, John Mahoney, Eli Marienthal, Christopher McDonald, and M. Emmet Walsh. Set during the Cold War in 1957, the film centers on a young boy named Hogarth Hughes, who discovers and befriends a giant alien robot. With the help of a beatnik artist named Dean McCoppin, Hogarth attempts to prevent the U.S. military and Kent Mansley, a paranoid federal agent, from finding and destroying the Giant.

The film's development began in 1994 as a musical with the involvement of the Who's Pete Townshend, though the project took root once Bird signed on as director and hired McCanlies to write the screenplay in 1996. The film was animated using traditional animation, with computer-generated imagery used to animate the titular character and other effects. The understaffed crew of the film completed it with half of the time and budget of other animated features. Michael Kamen composed the film's score, which was performed by the Czech Philharmonic.

The Iron Giant premiered in 1999, and significantly underperformed at the box office, grossing $31.3 million worldwide against a production budget of $50 million, which was blamed on Warner Bros.' unusually poor marketing campaign and skepticism towards animated film production following the mixed critical reception and box office failure of Quest for Camelot in the preceding year. Despite this, the film was praised for its story, animation, characters, the portrayal of the title character and the voice performances of Aniston, Connick Jr., Diesel, Mahoney, Marienthal and McDonald. The film was nominated for several awards, winning nine Annie Awards out of 15 nominations. Through home video releases and television syndication, the film gathered a cult following and is widely regarded as a modern animated classic. In 2015, an extended, remastered version of the film was re-released theatrically, and on home video the following year.

The film has gathered a cult following since its original release. When questioned over social media if there was ever a possibility of a sequel, Bird stated that because the film was considered a financial flop, a sequel was not likely to ever happen, but also stressed that he considered the story of The Iron Giant to be completely self-contained in the film, and saw no need for extending the story.

The designers of the 2015 video game Ori and the Blind Forest were guided by inspirations from the film and Disney's The Lion King.