Mystic River is a 2003 American drama film directed by Clint Eastwood, and starring Sean Penn, Tim Robbins, Kevin Bacon, Laurence Fishburne, Marcia Gay Harden, Laura Linney and Emmy Rossum. The film was written by Brian Helgeland, based on the novel of the same name by Dennis Lehane.

The film opened to widespread critical acclaim. It was nominated for 6 Academy Awards: Best Picture, Best Director, Best Actor, Best Adapted Screenplay, Best Supporting Actor, and Best Supporting Actress. Sean Penn won Best Actor and Tim Robbins won Best Supporting Actor.