 | Michelle Williams als Marilyn Monroe |
 | Kenneth Branagh als Sir Laurence Olivier |
 | Eddie Redmayne als Colin Clark |
 | Dominic Cooper als Milton Greene |
 | Philip Jackson als Roger Smith |
 | Derek Jacobi als Sir Owen Morshead |
 | Toby Jones als Arthur Jacobs |
 | Michael Kitchen als Hugh Perceval |
 | Julia Ormond als Vivien Leigh |
 | Simon Russell Beale als Cotes-Preedy |
 | Dougray Scott als Arthur Miller |
 | Zoë Wanamaker als Paula Strasberg |
 | Emma Watson als Lucy |
 | Judi Dench als Dame Sybil Thorndike |
 | Jim Carter als Barry |
 | Richard Clifford als Richard Wattis |
 | Robert Portal als David Orton |
 | Pip Torrens als Sir Kenneth Clark |
 | Geraldine Somerville als Lady Jane Clark |
 | Miranda Raison als Vanessa |
 | Karl Moffatt als Jack Cardiff |
 | Victor McGuire als Andy |
 | Richard Attlee als Reporter #1 |
 | Michael Hobbs als Reporter #2 |
| Brooks Livermore als Reporter #3 |
| Rod O'Grady als Reporter #4 |
 | Gerard Horan als Trevor |
 | Alex Lowe als Denys Coop |
 | Georgie Glen als Rosamund Greenwood |
| Richard Shelton als Waiter |
 | Peter Wight als Lucy's Father |
 | Paul Herzberg als Paul Hardwick |
| James Clay als Jeremy Spenser |
 | Des McAleer als Senior Policeman |
 | Jem Wall als Spectator |
| Ben Sando als Schoolboy #1 |
| Josh Morris als Schoolboy #2 |
 | David Rintoul als Dr. Connell |
| Sean Vanderwilt als Male Dancer #1 |
 | Adam Perry als Male Dancer #2 |
| Simon Curtis | Director |
| Adrian Hodges | Screenplay |
| David Parfitt | Producer |
| Harvey Weinstein | Producer |
| Deborah Aquila | Casting |
| Nina Gold | Casting |
| Tricia Wood | Casting |
| Ben Smithard | Director of Photography |
| Adam Recht | Editor |
| Bob Weinstein | Executive Producer |
| Kelly Carmichael | Executive Producer |
| Cleone Clarke | Associate Producer |
| Mark Cooper | Co-Producer |
| Simon Curtis | Executive Producer |
| Christine Langan | Executive Producer |
| Jamie Laurenson | Executive Producer |
| Ivan Mactaggart | Executive Producer |
| Colin Vaines | Co-Executive Producer |
| Donal Woods | Production Design |
| Charmian Adams | Supervising Art Director |
| Mark Kebby | Art Direction |
| Judy Farr | Set Decoration |
| Sara Desmond | Production Manager |
| Colin Clark | Book |
| Conrad Pope | Original Music Composer |
| Jill Taylor | Costume Designer |
| Maggie Rodford | Music Supervisor |
| Dana Sano | Music Supervisor |
| Alexandre Desplat | Main Title Theme Composer |
| Conrad Pope | Conductor |
| Lang Lang | Musician |
| Michelle Williams | Songs |
| Jenny Shircore | Makeup Designer |
| Jenny Shircore | Hair Designer |
| Jane Gibson | Choreographer |
| Kathleen Marshall | Choreographer |
| Denise Faye | Choreographer |
| Penny Ryder | Stunt Double |
| Guy Heeley | First Assistant Director |
| Charlotte Sewell | Costume Supervisor |
| Jason Wheeler | Location Manager |
| Richard Dyer | Sound Mixer |
| Vicki Howe | Script Supervisor |
| Jules Fisher | Lighting Design |
| Peggy Eisenhauer | Lighting Design |
| Charlie Reed | Second Assistant Director |
| Chris Foggin | Third Assistant Director |
| Adam Coles | Focus Puller |
| Rupert Lloyd-Parry | Key Grip |
| Martin Pakledinaz | Costume Designer |
| Mike Power | Property Master |
| Mark Clayton | Gaffer |
| Laurence Cendrowicz | Still Photographer |
| Mark Holt | Special Effects Supervisor |
| Julian Spencer | Stunt Coordinator |
| Belinda McGinley | Stunts |
| Sheila Wickens | Visual Effects Supervisor |
| Alan Church | Visual Effects Supervisor |
| Nick Lowe | Supervising Sound Editor |
| Catherine Hodgson | Sound Effects Editor |
| Alastair Sirkett | Sound Effects Editor |
| Myron Nettinga | Sound Effects Editor |
| Mike Dowson | Sound Re-Recording Mixer |
| Adam Scrivener | Sound Re-Recording Mixer |
| Paul Hanks | Foley Artist |
| Ian Waggott | Foley Artist |
| Tania Blunden | Post Production Supervisor |
| Kevin Day | Standby Property Master |
