Johnny Depp character James 'Whitey' Bulger
Joel Edgerton character John Connolly
Julianne Nicholson character Marianne Connolly
Dakota Johnson character Lindsey Cyr
Kevin Bacon character FBI Agent Charles McGuire
Benedict Cumberbatch character Billy Bulger
Peter Sarsgaard character Brian Halloran
Juno Temple character Deborah Hussey
Jesse Plemons character Kevin Weeks
David Harbour character John Morris
Adam Scott character FBI Agent Robert Fitzpatrick
Corey Stoll character Fred Wyshak
W. Earl Brown character John Martorano
Bill Camp character John Callahan (uncredited)
Mark Mahoney character Mickey Maloney
Brad Carter character John McIntyre
Scott G. Anderson character Tommy King
Lonnie Farmer character DEA Agent Eric Olsen (Interrogator)
Mary Klug character Mom Bulger
Erica McDermott character Mary Bulger
Luke Ryan character Douglas Cyr
Owen Burke character Buddy Leonard
Lewis D. Wheeler character Jeremiah O'Sullivan
Billy Meleady character Joe Cahill
Jamie Donnelly character Mrs. Cody
David De Beck character Roger Wheeler
Gary Galone character State Captain
Rory Cochrane character Stephen Flemmi
James Russo character Agent Scott Gariola
Jeremy Strong character Josh Bond
Danae Nason character McGuire's Secretary
Bretton Manley character Young Boy
Berglind Jonsdottir character Anna Bjornsdottir
Robert Walsh character Sr. FBI Official (voice)
David Conley character Officer Flynn
Ciaran Crawford character Irish Nationalist
Thomas Philip O'Neill character FBI Wire Tech
Joey Vacchio character Joey, Big Italian
Bill Haims character Gennaro Angiulo
Anthony Molinari character Charlie McTiernan
Declan Mulvey character Charlie's Friend
Bates Wilder character Agent James
Marc Carver character Dick Lehr
Richard Donelly character Gerard O'Neill
Brian A. White character Prisoner
Peter Morse character FBI Agent
Tom Kemp character Father Mackey
Patrick M. Walsh character Michael Donahue
Naheem Garcia character DEA Agent
Kathryn A. Beauchamp character Nurse
Stephen Curran character Drug Dealer
Darin X.L. MacEachern character Drug Dealer
Cary 'Big Shug' Guy character Drug Dealer
Sean Malone character Crook
Jack Neary character Barman
Jimmy Joe Maher character Boot Shop Owner
Forry Buckingham character World Jai Alai Chairman
Danny DeMiller character Porthole Bartender
Michael F. Murphy character Porthole Customer
Alexander Cook character DEA Agent Dan Doherty
Ava Cooper character Little Mary Bulger
Stella Cooper character Kathleen Bulger
Arthur Hiou character Driver
Todd Ryan Jones character Charlie's Friend
Julie Ann Dawson character Floor Dancer (uncredited)
