The Departed is a 2006 crime thriller film directed by Martin Scorsese, starring Leonardo DiCaprio, Matt Damon, Jack Nicholson and Mark Wahlberg. It is an American remake of the 2002 Hong Kong crime thriller Infernal Affairs.

This film takes place in Boston, Massachusetts, where notorious Irish Mob boss Francis "Frank" Costello (Nicholson) plants his protégé Colin Sullivan (Damon) as an informant within the Massachusetts State Police. Simultaneously, the police assign undercover cop William Costigan, Jr. (DiCaprio) to infiltrate Costello's crew. When both sides of the law realize the situation, each man attempts to discover the other's true identity before being found out.