Unfaithful is a 2002 American erotic thriller film written by Alvin Sargent and William Broyles Jr. and directed by Adrian Lyne. The film stars Richard Gere, Diane Lane, Chad Lowe, Dominic Chianese and Olivier Martinez. It was adapted by Alvin Sargent and William Broyles Jr. from the French film The Unfaithful Wife (1968) (La Femme infidèle) by the noted director Claude Chabrol. It tells about a couple living in suburban New York City whose marriage goes dangerously awry when the wife indulges in an adulterous affair with a stranger she encounters by chance in Manhattan.
Unfaithful grossed $52 million in North America and a total of $119 million worldwide. Despite mixed reviews overall, Lane received much praise for her performance. She won awards for best actress from the National Society of Film Critics and New York Film Critics, and was nominated for a Golden Globe and an Academy Award for Best Actress.