- Hugh Williams
- Colin Metcalfe
- Griffith Jones
- Police Inspector Gunter
- Deborah Kerr
- Kari Alstad
- Ralph Richardson
- Frank Lockwood
- Francis L. Sullivan
- Kommandant Ulrich Wettau
- Roland Culver
- Cmdr. Pittwaters
- Finlay Currie
- Capt. Alstad
- Niall MacGinnis
- Olaf
- Elizabeth Mann
- Gerda
- Raymond Huntley
- Norwegian Under Secretary (scenes deleted)
- Patricia Medina
- Ingrid
- Roland Pertwee
- Capt. Waverley - Naval Intelligence
- Henry Oscar
- Newspaper Editor
- David Horne
- Evans, Foreign Editor
- Henry Hewitt
- Jack, News Editor
- John Warwick
- Milligan, Reporter in Fleet Street Pub
- Brefni O'Rorke
- Political Journalist
- Bernard Miles
- McAllister (Irish Soldier)
- Beckett Bould
- Bergen, Spokesman of Langedal
- Olaf Olsen
- Langedal's Schoolmaster
- Gus McNaughton
- Army Sergeant
- George Carney
- Harry, Soldier in Fleet Street Pub
- John Salew
- "Man-in-the-Street" in Fleet Street Pub
- Meriel Forbes
- Milly, the Barmaid
- Philip Friend
- Pilot
- George Merritt
- German Trawler Captain
- John Boxer
- U-Boat Commander
- H Victor Weske
- Heinrich
- Gerhard Kempinski
- Barman, Bia Tonne in Oslo
- Ronald Adam
- Daily Express Reporter in Phone Booth
- Frank Atkinson
- Drunk at Oslo Quayside
- Gordon Begg
- Old Man with Beard
- Johnny Brandon
- Bit part
- Derek Briggs
- Page
- H. Carleton-Crowe
- Old Man
- James B. Carson
- Petty Officer
- Albert Chevalier
- Receptionist
- Eric Clavering
- American Sailor at Bia Tonne in Oslo
- Clifford Cobbe
- German Officer
- Peter Cozens
- Norwegian Sailor
- Patric Curwen
- Reporter
- Tommy Duggan
- American Reporter in Oslo Hotel
- Valentine Dyall
- German Guard at Cell Door Hatchway
- Derek Elphinstone
- Lieutenant Commander at Admiralty
- Glen Farmer
- 2nd Pilot
- Gordon Glennon
- Lieutenant at Cherbourg
- Madeleine Godar
- Baker's Wife
- Walter Gotell
- German Soldier
- Alan Haines
- Bomb Aimer
- Bryan Herbert
- Reporter
- Vincent Holman
- Sergeant-Major at Evacuation
- Hamilton Humphreys
- German Soldier
- Mike Johnson
- Pilot of 2nd Bomber
- Vi Kaley
- Old Woman
- James Knight
- Fossen the Village Postmaster
- Jack Lester
- American Reporter in Oslo Hotel
- Stuart Lindsell
- Reporter
- Harry Locke
- (uncredited)
- Brian Nissen
- Page
- Barry O'Neill
- Naval Commander
- Conway Palmer
- American Sailor at Bia Tonne in Oslo
- Stan Paskin
- Cockney Soldier
- Lloyd Pearson
- Wettau's Assistant
- George Pughe
- Cockney Soldier
- Robert Rendel
- Captain of Destroyer
- Patrick Ross
- R.A.M.C.
- Johnnie Schofield
- Soldier in Fleet Street Pub with Harry
- Jack Sharp
- German Soldier in Bar Fight
- Anthony Shaw
- Naval Commander
- George Skillan
- Fritz
- John Slater
- American Reporter In Oslo Hotel
- George Spence
- Norweigan Villager
- George Street
- U-Boat Commander
- George Turner
- Drunk
- Robert Brooks Turner
- German Engineer
- Jack Watling
- Lieutenant
- Billy Wells
- Barman
- Michael Whittaker
- Sub-Lieutenant
- Ben Williams
- Wine Waiter
- D.J. Williams
- Petersen
- George Woodbridge
- Journalist Sitting at Bar in Pub
- Dennis Wyndham
- Village Baker
