Michelle Williams as Marilyn Monroe

Kenneth Branagh as Sir Laurence Olivier

Eddie Redmayne as Colin Clark

Dominic Cooper as Milton Greene

Philip Jackson as Roger Smith

Derek Jacobi as Sir Owen Morshead

Toby Jones as Arthur Jacobs

Michael Kitchen as Hugh Perceval

Julia Ormond as Vivien Leigh

Simon Russell Beale as Cotes-Preedy

Dougray Scott as Arthur Miller

Zoë Wanamaker as Paula Strasberg

Emma Watson as Lucy

Judi Dench as Dame Sybil Thorndike

Jim Carter as Barry

Richard Clifford as Richard Wattis

Robert Portal as David Orton

Pip Torrens as Sir Kenneth Clark

Geraldine Somerville as Lady Jane Clark

Miranda Raison as Vanessa

Karl Moffatt as Jack Cardiff

Victor McGuire as Andy

Richard Attlee as Reporter #1

Michael Hobbs as Reporter #2

Brooks Livermore as Reporter #3

Rod O'Grady as Reporter #4

Gerard Horan as Trevor

Alex Lowe as Denys Coop

Georgie Glen as Rosamund Greenwood

Richard Shelton as Waiter

Peter Wight as Lucy's Father

Paul Herzberg as Paul Hardwick

James Clay as Jeremy Spenser

Des McAleer as Senior Policeman

Jem Wall as Spectator

Ben Sando as Schoolboy #1

Josh Morris as Schoolboy #2

David Rintoul as Dr. Connell

Sean Vanderwilt as Male Dancer #1

Adam Perry as Male Dancer #2