Sean Penn character Jimmy Markum
Tim Robbins character Dave Boyle
Kevin Bacon character Sean Devine
Laurence Fishburne character Sergeant Whitey Powers
Marcia Gay Harden character Celeste Boyle
Laura Linney character Annabeth Markum
Kevin Chapman character Val Savage
Tom Guiry character Brendan Harris
Emmy Rossum character Katie Markum
Eli Wallach character Mr. Loonie - Liquor Store Owner (uncredited)
Spencer Treat Clark character Silent Ray Harris
Andrew Mackin character John O'Shea
Adam Nelson character Nick Savage
Robert Wahlberg character Kevin Savage
Jenny O'Hara character Esther Harris
John Doman character Driver
Cameron Bowen character Young Dave
Jason Kelly character Young Jimmy
Connor Paolo character Young Sean
T. Bruce Page character Jimmy's Father
Miles Herter character Sean's Father
Cayden Boyd character Michael Boyle
Tori Davis character Lauren Devine
Jonathan Togo character Pete
John Franchi character Bar Patron
Ed O'Keefe character Communion priest
Shawn Fitzgibbon character Funeral Director
Will Lyman character FBI Agent Birden
Celine du Tertre character Nadine Markum
Ari Graynor character Eve Pigeon
Zabeth Russell character Diane Cestra
Joe Stapleton character Drew Pigeon
Susan Willis character Mrs. Prior
Tom Kemp character CSS Tech
Celeste Oliva character Trooper Jenny Coughlin
Patrick Shea character Handcuffed Man
Michael McGovern character '75 Reporter
Kevin Conway character Theo (uncredited)
Mackenzie Hawe character Communion Child (uncredited)
Colleen Kelly character Boston Cop (uncredited)
Stephen Kyle character Shopper (uncredited)
Frank Ridley character Police Detective (uncredited)
Kris Williams character Spectator (uncredited)
Jillian Wheeler character Sara Markum (uncredited)
