WarGames is a 1983 American techno-thriller film directed by John Badham, written by Lawrence Lasker and Walter F. Parkes, and starring Matthew Broderick, Dabney Coleman, John Wood and Ally Sheedy. Broderick plays David Lightman, a young computer hacker who unwittingly accesses a United States military supercomputer programmed to simulate, predict and execute nuclear war against the Soviet Union, triggering a false alarm that threatens to start World War III.

The film premiered at the 1983 Cannes Film Festival, and was released by MGM/UA Entertainment on June 3, 1983. It was a widespread critical and commercial success, grossing $125 million worldwide against a $12 million budget. At the 56th Academy Awards, the film was nominated for three Oscars, including Best Original Screenplay. It also won a BAFTA Award for Best Sound.

WarGames is credited with popularizing concepts of computer hacking, information technology, and cybersecurity in wider American society. It spawned several video games, a 2008 sequel film, and a 2018 interactive series.