Mystic River is a 2003 American neo-noir crime drama film directed and co-produced by Clint Eastwood, and starring Sean Penn, Tim Robbins, Kevin Bacon, Laurence Fishburne, Marcia Gay Harden, and Laura Linney. The screenplay, written by Brian Helgeland, was based on the 2001 novel of the same name by Dennis Lehane. It is the first film in which Eastwood was credited as composer of the score.

Clinton Eastwood Jr. is an American actor and film director. After achieving success in the Western TV series Rawhide, Eastwood rose to international fame with his role as the "Man with No Name" in Sergio Leone's Dollars Trilogy of spaghetti Westerns during the mid-1960s and as antihero cop Harry Callahan in the five Dirty Harry films throughout the 1970s and 1980s. These roles, among others, have made Eastwood an enduring cultural icon of masculinity. Elected in 1986, Eastwood served for two years as the mayor of Carmel-by-the-Sea, California.