Disturbing Behavior is a 1998 teen science fiction psychological horror film starring James Marsden, Katie Holmes, and Nick Stahl. The film was directed by David Nutter, who was a director and producer on The X-Files, and the screenplay was written by Scott Rosenberg. The plot follows a group of high school outcasts who discover their seemingly perfect "Blue Ribbon" classmates are part of an elaborate mind control experiment.

The film, which contains nods to 1975 thriller The Stepford Wives, premiered on July 24, 1998, and received negative reviews. The film went through numerous studio-mandated cuts from MGM prior to theatrical release in response to negative test screenings. There has been considerable fan support for the release of a director's cut version that restores deleted scenes.