 | Tom Hardy als Ronald Kray / Reginald Kray |
 | Emily Browning als Frances Shea |
 | Christopher Eccleston als Leonard 'Nipper' Read |
 | David Thewlis als Leslie Payne |
 | Taron Egerton als Mad Teddy Smith |
 | Chazz Palminteri als Angelo Bruno |
 | Colin Morgan als Frank Shea |
 | Paul Bettany als Charlie Richardson |
 | Tara Fitzgerald als Elsie Shea |
 | Aneurin Barnard als David Bailey |
 | Paul Anderson als Albert Donoghue |
 | Nicholas Farrell als Dr Humphries |
 | Duffy als Timi Yuro |
 | Kevin McNally als Harold Wilson |
 | John Sessions als Lord Boothby |
 | Sam Spruell als Jack 'The Hat' McVitie |
 | Millie Brady als Joan Collins |
 | Charley Palmer Rothwell als Leslie Holt |
 | Bob Cryer als Charles Kray Snr |
 | Samantha Pearl als Shirley Bassey |
 | Martin McCreadie als Eddie Richardson |
| Jane Wood als Violet Kray |
 | Mel Raido als Ian Barrie |
 | Adam Fogerty als Pat Connolly |
 | Lorraine Stanley als Blind Beggar Barmaid |
 | Shane Attwooll als George Cornell |
 | Stephen Lord als Fuller |
 | Tim Woodward als Superintendent Cummings |
 | Chris Mason als Ronnie Hart |
 | Frankie Fitzgerald als Jack Dickson |
 | Sam Hoare als Stefan De Faye |
 | Joshua Hill als Constable Scott |
 | MAJOR. als The Double R Club Singer |
 | Christopher Adamson als Philip Testa |
 | Lara Cazalet als Mrs Payne |
 | Nick Hendrix als Hew McCowan |
| Ashley Byam als John |
 | John Sears als Father Foster |
 | Robin Hooper als Prison Doctor (uncredited) |
| John Carr als Guest at Club (uncredited) |
 | Julia Papp als Casino Guest (uncredited) |
 | Tim Faraday als Big Screw |
 | Amaëlle Cunningham als Isabella Rose |
| Brian Helgeland | Writer |
| Brian Helgeland | Director |
| Peter McNulty | Editor |
| Beverly Winston | Script Supervisor |
| Lucinda Syson | Casting |
| Eric Fellner | Producer |
| Brian Oliver | Producer |
| Chris Clark | Producer |
| Quentin Curtis | Producer |
| Tom Conroy | Production Design |
| Tim Bevan | Producer |
| Jane Robertson | Co-Producer |
| Carter Burwell | Original Music Composer |
| Olivier Courson | Executive Producer |
| John Pearson | Book |
| Tom Hardy | Executive Producer |
| Kate Solomon | Executive Producer |
| Tyler Thompson | Executive Producer |
| Ron Halpern | Executive Producer |
| Buddy Patrick | Executive Producer |
| Liz Gallacher | Music Supervisor |
| Crispian Sallis | Set Decoration |
| Simon Mein | Still Photographer |
| Caroline Harris | Costume Design |
| Dick Pope | Director of Photography |
| Marco Anton Restivo | Art Direction |
| Gareth Cousins | Art Direction |
| Adam Milo Smalley | Music Editor |
| Litza Bixler | Choreographer |
| Kate Ringsell | Casting Associate |
| Rebecca White | Assistant Art Director |
| Sheara Abrahams | Assistant Costume Designer |
| Dan Osborne | Armorer |
| Ray Marston | Wigmaker |
| Marco Scotti | Costume Supervisor |
| Oliver Benson | Assistant Art Director |
| Kirsty Mcqueen | Makeup Artist |
| Emma Heath | Set Costumer |
| Christine Blundell | Makeup Artist |
| Audrey Doyle | Makeup Artist |
| Muffin Green | Property Master |
| Oliver Southall | Set Costumer |
| Peter Mallouk | Executive Producer |
| Ray Mallouk | Executive Producer |
| Amelia Granger | Executive Producer |
| Michael Bassick | Executive Producer |
| Liza Chasin | Executive Producer |
| Christopher Woodrow | Executive Producer |
| Timmy Thompson | Executive Producer |
| Ben Meechan | Sound Designer |
| Dafydd Archard | Sound Mix Technician |
| Kirsten Lane | Music Supervisor |
| Julian Spencer | Stunt Coordinator |
| Zarene Dallas | Stunts |
| Matt Crook | Stunts |
| Elo Soode | Concept Artist |
| Elo Soode | Conceptual Design |
| Peter Burgis | Foley Artist |
| Mark Appleby | ADR Mixer |
| Glen Gathard | Foley Mixer |
| Jeffrey J. Haboush | Sound Re-Recording Mixer |
| Peter Hanson | Foley Editor |
| Nick Kray | ADR Mixer |
| Jason Swanscott | Foley Artist |
| Kevin Penney | Foley Editor |
| Mark Taylor | Sound Re-Recording Mixer |
| Jack Stew | Foley Artist |
| Jemma Riley-Tolch | Assistant Foley Artist |
| Adam Horley | Dialogue Editor |
| Christine Blundell | Hairstylist |
| Sophie Finch | Makeup Artist |
| Chris Lyons | Special Effects Makeup Artist |
| Nathaniel De'Lineadeus | Special Effects Makeup Artist |
| Jo Nielsen | Hairstylist |
| Chloe Meddings | Makeup Artist |
| Chloe Meddings | Hairstylist |
| Nuria Mbomio | Makeup Artist |
| Lee Nicholas Harris | Makeup Artist |
| Kevin Day | Props |
