Ben Affleck (Joe Coughlin), Elle Fanning (Loretta Figgis), Brendan Gleeson (Thomas Coughlin), Chris Messina (Dion Bartolo), Sienna Miller (Emma Gould), Zoe Saldaña (Graciella Suarez), Chris Cooper (Chief Irving Figgis) more..., Remo Girone (Maso Pescatore), Anthony Michael Hall (Gary Smith), Titus Welliver (Tim Hickey), Derek Mears (Donnie Gishler), Max Casella (Digger Pescatore), Robert Glenister (Albert White), Chris Sullivan (Brendan Loomis), J.D. Evermore (Virgil Beauregard), Tom Virtue (Doctor), Benny Ciaramello (Paulo Bartolo), Matthew Maher (RD Pruitt), Bruno Amato (Jeff), Michael Mantell (Jack Jarvis), Michael Chieffo (Pastor), Andrew Bongiorno (Fasani), Austin Swift (Mayweather), Mark Burzenski (Statler Guest (uncredited)), Lucy Angelo (Train Passenger (uncredited)), Larry Eudene (Northend Newspaper Vendor (uncredited)), Lexie Roth (Gillette Factory Worker (uncredited)), Katie O'Malley (Cigarette Girl (uncredited)), John Bishop (Disheveled Man (uncredited)), Lewis D. Wheeler (Herald Reporter), Clark Gregg (Calvin Bondurant), Heidi Moneymaker (Assassin (uncredited)), Michael Papajohn (Maso's Crew (uncredited)), Bill Blair (Factory Worker (uncredited)), Lucien Spelman (Statler Party Guest (uncredited)), Christian Clemenson (Ritz Investor), Anthony Molinari (Maso's Crew (uncredited)), Tony Sagastizado I (Migrant worker (uncredited)), Derrick Dover (Bodyguard)

Ben Affleck (Screenplay), Dennis Lehane (Novel), Karin Silvestri (Stunts), Robert Richardson (Director of Photography), William Goldenberg (Editor), Harry Gregson-Williams (Original Music Composer), Jacqueline West (Costume Design) more..., Jess Gonchor (Production Design), Ben Affleck (Producer), Chris Brigham (Executive Producer), Chay Carter (Executive Producer), Leonardo DiCaprio (Producer), Jennifer Todd (Producer), David Webb (Co-Producer), Lora Kennedy (Casting), Mindy Marin (Casting), Stephen Christensen (Art Direction), Christa Munro (Supervising Art Director), Bradley Rubin (Supervising Art Director), Dawn Swiderski (Art Direction), Jeremy Woodward (Art Direction), Jennifer Davisson (Producer), Zack Gonchor (Assistant Art Director), Timothy Eulich (Stunts), Deborah Rutherford (Key Makeup Artist), Doug Coleman (Stunts), Chris Palermo (Stunt Driver), Matt McColm (Stunts), Christopher Ferguson (Lighting Programmer), Matt Leonard (Stunts), Shawnna Thibodeau (Stunts), Tim Trella (Stunt Coordinator), Casey O'Neill (Stunts), Zachary Fannin (Graphic Designer), Megan Blake (Graphic Designer), Natasha Mullan (Camera Loader), Jon Valera (Fight Choreographer), Yvan Lucas (Digital Intermediate Colorist), David Webb (First Assistant Director), Bob E. Krattiger (Gaffer) and others.