- José Ferrer
- Major Geoffrey Stringer
- Trevor Howard
- Captain Hugh Thompson
- Dora Bryan
- Myrtle
- Christopher Lee
- Lieutenant-Commander Greaves
- Victor Maddern
- Marine Sgt. Craig
- Anthony Newley
- Marine Clarke
- David Lodge
- Marine Ruddock
- Peter Arne
- Marine Corporal Stevens
- Percy Herbert
- Marine Lomas
- Graham Stewart
- Marine Booth
- John Fabian
- Marine Cooney
- John Van Eyssen
- Marine Bradley
- Robert Desmond
- Marine Todd
- Walter Fitzgerald
- Gestapo Commandant
- Karel Stepanek
- Assistant Gestapo Officer
- Beatrice Campbell
- Mrs. Ruddock
- Sydney Tafler
- Policeman
- Gladys Henson
- Barmaid
- Jacques B. Brunius
- French Fisherman
- Andreas Malandrinos
- French Fisherman
- Judith Furse
- W.V.S. Woman
- Patric Doonan
- Claridge - Sailor in Pub
- John Adams
- Man in Pub
- Chris Adcock
- German Soldier
- Derek Aylward
- Marine Sergeant with Moustache
- Sheila Aza
- WAAC
- John Rowsley Beesley
- Marine 2
- John Blythe
- Maurice - Mrs. Ruddock's Lodger
- Eddie Boyce
- Barman
- Bill Brandon
- Captain
- Maurice Bush
- German Soldier
- Jack Carter
- Soldier
- Tony Castleton
- Seaman
- Robert Leonard Cherry
- Marine 3
- Jess Conrad
- Sailor in Pub
- Bill Cummings
- Seaman
- Fred Haggerty
- Marine
- Charles Hammond
- Marine
- Aidan Harrington
- Man in Pub
- Frank Hawkins
- Ambulanceman
- Eric Henderson
- Landlord
- Russell Hunter
- Submarine Sonar Operator
- Barry Johns
- Marine / Pub Patron (uncredited)
- Sam Kydd
- Truck Driver
- Mary Maxfield
- Wren
- Roger Maxwell
- Train Passenger
- Pat McGrath
- Marine Bellamy
- Colin McKenzie
- Reporter
- Antic Melkior
- Marine
- Norman Morris
- Man in pub
- John Payne
- Marine Delivering Confidential Message
- Aubrey Richards
- Submariner
- Fred Stroud
- Marine
- Harry Van Engel
- Sailor
- Yana
- Wren Singer in Pub
