Westworld is a 1973 American science-fiction Western thriller film written and directed by Michael Crichton. Its plot concerns amusement park androids that malfunction and begin killing visitors. It stars Yul Brynner as an android in a futuristic Western-themed amusement park, and Richard Benjamin and James Brolin as guests of the park.

The film was from an original screenplay by novelist Crichton, and served as his feature directorial debut. It was also the first feature film to use digital image processing to pixellate photography to simulate an android point of view. The film was nominated for Hugo, Nebula, and Saturn awards.

Westworld was followed by a sequel, Futureworld (1976), and a short-lived television series, Beyond Westworld (1980). A television series based on the film debuted in 2016 on HBO.