Kristen Stewart as Diana

Timothy Spall as Major Alistair Gregorys

Jack Nielen as William

Freddie Spry as Harry

Jack Farthing as Charles

Sean Harris as Darren

Stella Gonet as The Queen

Richard Sammel as Prince Philip

Elizabeth Berrington as Princess Anne

Lore Stefanek as Queen Mother

Amy Manson as Anne Boleyn

Sally Hawkins as Maggie

James Harkness as Footman Paul

Laura Benson as Angela (Dresser)

Wendy Patterson as Maria (Older Maid)

Libby Rodliffe as Pamela (Maid)

John Keogh as Michael (Charles' Valet)

Marianne Graffam as Barbara (Nanny)

Ben Plunkett-Reynolds as Footman Brian

Ryan Wichert as Staff Sergeant Wood

Michael Epp as Lance Corporal Jacobs

Tom Hudson as Police Constable Thomas

James Gerard as Police Constable Field

Thomas Douglas as John Spencer

Ian Ashpitel as Vicar

Emma Darwall Smith as Camilla Parker Bowles

Kimia Schmidt as Diana (9 Years)

Greta Bücker as Diana (Late Teenage Years)

Henry Castello as Charles Spencer (9 Years)

Christin Schreiber as Alter Ego Diana

Camille Loup Moltzen as Boy (Roadhouse Cafe)

Mudassar Dar as KFC Employee

Niklas Kohrt as Prince Andrew

Peter Lee as Church Organist

Olga Hellsing as Sarah Ferguson (uncredited)

Matthias Wolkowski as Prince Edward (uncredited)

Oriana Gordon as Lady Sarah Chatto (uncredited)

Sami Amber as Boy (Roadhouse Cafe) (uncredited)