The Departed is a 2006 American crime thriller film, fashioned as a remake of the 2002 Hong Kong film Infernal Affairs. The film was directed by Martin Scorsese and written by William Monahan. Like Infernal Affairs before it, The Departed is noted for its star-studded cast, including Leonardo DiCaprio, Matt Damon, Jack Nicholson, Mark Wahlberg, Martin Sheen, Ray Winstone, Vera Farmiga and Alec Baldwin.

It won several awards, including Oscars at the 79th Academy Awards; Best Picture, Best Director (Scorsese), Best Adapted Screenplay and Best Film Editing. Wahlberg was nominated for Best Supporting Actor but lost to Alan Arkin for his role in Little Miss Sunshine.

The film takes place in Boston, Massachusetts, where Irish Mob boss Francis "Frank" Costello plants Colin Sullivan as an informant within the Massachusetts State Police. Simultaneously, the police assign undercover cop William "Billy" Costigan to infiltrate Costello's crew. When both sides realise the situation, each man attempts to discover the other's true identity before his own cover is blown.