Changing Lanes is a 2002 American drama thriller film directed by Roger Michell and starring Ben Affleck and Samuel L. Jackson. The film follows a successful, young Wall Street lawyer (Affleck) who accidentally crashes his car into a vehicle driven by a middle-aged, recovering alcoholic insurance salesman (Jackson). After the lawyer leaves the scene of the accident, the two men try to get back at each other, engaging in a variety of immoral and illegal actions that end up having a major impact on each man's life.

The film was released on April 12, 2002, in North America by Paramount Pictures. The film was favorably reviewed by critics, and it was a box office success, earning almost $95 million against a $45 million budget. Writers Chap Taylor and Michael Tolkin were nominated for the WAFCA Award for Best Original Screenplay for their work. It was later remade in Hindi as Taxi No. 9211.