Alien 3  is a 1992 American science-fiction horror film directed by David Fincher in his directorial debut, produced by Gordon CarrollDavid Giler and Walter Hill, and written by Giler, Hill and Larry Ferguson from a story by Vincent Ward. It serves as the third film installment of the Alien franchise, and takes place after the events of Aliens (1986).

The film stars Sigourney Weaver reprising her role as Ellen Ripley. She and an Alien organism are the only ones to survive the Colonial Marine spaceship Sulaco's escape pod's crash on a planet housing a penal colony populated by violent male inmates; additional roles are played by Charles DanceCharles S. Dutton and Lance Henriksen.

The film faced large-scale problems during production, including shooting without a script, with various screenwriters and directors attached. Fincher was finally cast in, after a proposed version with Vincent Ward at the helm was cancelled well into pre-production.

While underperforming at the United States box office, it earned over $100 million outside of North America. The film received polarized reviews and was regarded as inferior to the previous installments. Fincher has since disowned the film, blaming studio interference and deadlines. In 2003, a revised version of the film, known as the Assembly Cut, was released without Fincher's involvement, but received a warmer reception than the release version.