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