James McAvoy as Robbie Turner

Keira Knightley as Cecilia Tallis

Saoirse Ronan as Briony Tallis (Age 13)

Romola Garai as Briony Tallis (Age 18)

Vanessa Redgrave as Briony Tallis (Age 77)

Brenda Blethyn as Grace Turner

Juno Temple as Lola Quincey

Benedict Cumberbatch as Paul Marshall

Harriet Walter as Emily Tallis

Alfie Allen as Danny Hardman

Jérémie Renier as Luc Cornet

Anthony Minghella as Interviewer

Tobias Menzies as Naval Officer

Peter Wight as Police Inspector

Gina McKee as Sister Drummond

Tilly Vosburgh as Mother of Evacuees

John Normington as Vicar

Patrick Kennedy as Leon Tallis

Peter McNeil O'Connor as Police Sergeant

Daniel Mays as Tommy Nettle

Nonso Anozie as Frank Mace

Michelle Duncan as Fiona Maguire

Michel Vuillermoz as Frenchman

Lionel Abelanski as Frenchman

Roger Evans as Beach Soldier

Bronson Webb as Beach Soldier

Ian Bonar as Beach Soldier

Jamie Beamish as Soldier in Bray Bar

Johnny Harris as Soldier in Bray Bar

Billy Seymour as Soldier in Bray Bar

Neil Maskell as Soldier in Bray Bar

Nick Bagnall as Soldier in Bray Bar

Vivienne Gibbs as Staff Nurse

Alice Orr-Ewing as Probationary Nurse

Olivia Grant as Probationary Nurse

Katy Lawrence as Probationary Nurse

Paul Stocker as Crying Soldier

Alex Noodle as Solitary Sunbather

Kelly Scott as Hospital Admin Assistant

Ryan Kiggell as Registrar

Wendy Nottingham as Mrs. Jarvis

Julia West as Betty

Felix von Simson as Pierrot Quincey

Charlie von Simson as Jackson Quincey

Leander Deeny as Police Constable

Mark Holgate as Soldier at Hospital Entrance

Romola Garai as Briony, 18

Elliott Francis as Soldier (uncredited)

Craig Douglas as Soldier (uncredited)