Benedict Cumberbatch

• Alan Turing

Keira Knightley

• Joan Clarke

Matthew Goode

• Hugh Alexander

Rory Kinnear

• Detective Robert Nock

Allen Leech

• John Cairncross

Matthew Beard

• Peter Hilton

Charles Dance

• Commander Denniston

Mark Strong

• Stewart Menzies

James Northcote

• Jack Good

Tom Goodman-Hill

• Sergeant Staehl

Steven Waddington

• Superintendent Smith

Ilan Goodman

• Keith Furman

Jack Tarlton

• Charles Richards

Alex Lawther

• Young Alan Turing

Jack Bannon

• Christopher Morcom

Tuppence Middleton

• Helen

Dominic Charman

• Sherborne Student 1

James G. Nunn

• Sherborne Student 2

Charlie Manton

• Sherborne Student 3

David Charkham

• Joan's Father

Victoria Wicks

• Joan's Mother

Andrew Havill

• Teacher

Laurence Kennedy

• Headmaster

Tim van Eyken

• MI6 Agent

Will Bowden

• Military Policeman

Miranda Bell

• Margaret

Tim Steed

• Electrical Assistant

Hayley Joanne Bacon

• Woman in Crowd (uncredited)

Nicholas Blatt

• Ministry Man (uncredited)

Ancuta Breaban

• Wren (uncredited)

Alex Corbet Burcher

• Dancer (uncredited)

Grace Calder

• Assistant Wren (uncredited)

Richard Campbell

• Crossword Man in Pub (uncredited)

Daniel Chapple

• MI6 Agent (uncredited)

Lisa Colquhoun

• Joan Clarke's Friend (uncredited)

Alexander Cooper

• Bletchley Park Agent (uncredited)

Leigh Dent

• Passerby (uncredited)

Sam Exley

• Military Policeman 3 (uncredited)

Dennis Good

• Civilian (uncredited)

Debra Leigh-Taylor

• Evacuee (uncredited)

Stuart Matthews

• Bletchley Park Operative (uncredited)

Joseph Oliveira

• MI6 Agent (uncredited)

David G. Robinson

• Police Sergeant White (uncredited)

Mark Underwood

• Crossword Man (uncredited)

Nicola-Jayne Wells

• First Aid Nurse (uncredited)

Josh Wichard

• German Pilot (uncredited)

Joshua Wichard

• German Spy Plane Pilot (uncredited)

Morten Tyldum

Graham Moore

Andrew Hodges

Phil Booth

James Manning

Albert Carreras

Tim Battersby

Simon Surtees

Marc Gómez del Moral

Rory Moles

Alexandra Voikou

Gary Hutchings

Crispin Reece

Steven Hall

William Goldenberg

Nina Gold

Óscar Faura

Maria Djurkovic

Rebecca Milton

Marco Anton Restivo

Sammy Sheldon

Nora Grossman

Graham Moore

Ido Ostrowsky

Teddy Schwarzman

Peter Heslop

Alexandre Desplat

Denise Kum

Roo Maurice

Amy Riley

Lauren Briggs-Miller

Nicky Ackland-Snow

Peter Burgis

Andy Kennedy

Joe Beal

Martin Jensen

Stuart Hilliker

Lee Walpole

Lucy Ainsworth-Taylor

Eran Barnea

Angela Barson

Peter Wignall

Jack English

Jonathan Collard

Kirsty Whalley

Beverly Winston

Sarah Shepherd

Richard George

Suzie Shearer

Nick Dent

Robert Messinger

John Midgley

Tatiana Macdonald

Nick Thomas

Dan Green

Charis Theobald

Katie Anna Brady

Levan Doran

Matt Curtis