Kenneth More
Role: Lt. Cmdr. Robert Badger
Lloyd Nolan
Role: Vice Admiral Ryan
Joan O'Brien
Role: Lt. Carol Blair
John Le Mesurier
Role: George Dewberry Sr.
Brian Wilde
Role: Petty Officer Gilors
Warren Mitchell
Role: 'Honest' Marcel
Wanda Ventham
Role: Dartmouth Girl
Sidney James
Role: Dance Instructor
Mischa Auer
Role: Colonel & President
Paul Maxwell
Role: Commander Spelling U.S.N.
Nicholas Stuart
Role: Captain Hurley U.S.N.
Alexis Kanner
Role: Garrett
Robin Hawdon
Role: Williams
Esma Cannon
Role: Consul's Wife
Kenneth Griffith
Role: Orator
Marie France Dousset
Role: Françoise
Michael Kilgarriff
Role: Claude
Neil McCarthy
Role: Sergeant
Tutte Lemkow
Role: Corporal
Lally Bowers
Role: Mrs. Dewberry
Laurence Naismith
Role: Admiral Blake
Andrew Cruickshank
Role: Admiral Filmer
Walter Fitzgerald
Role: Admiral Thomas
Ronald Leigh-Hunt
Role: Commander R.N.
Arthur Lovegrove
Role: C.P.O. Froud
Jeremy Lloyd
Role: The Midshipman/Dewberry
Dinsdale Landen
Role: The Midshipman/Bowles
Michael Bentine
Role: Psychologist
Rodney Bewes
Role: Recruitment Interviewee (uncredited)
Dirk Bogarde
Role: Dr. Simon Sparrow (uncredited)
Peter Brace
Role: Leather Jacket Rebel (uncredited)
Robert Cawdron
Role: Marcel's Bar Patron (uncredited)
Graham Crowden
Role: Naval Officer (uncredited)
Andrew Sachs
Role: Short-Changed US Seaman
Ian Selby
Role: Shocked Man in Cafe (uncredited)
Guy Standeven
Role: American Naval Officer (uncredited)
Richard Vernon
Role: Government Official at Enquiry (uncredited)
David Warner
Role: Sailor Painting Ship (uncredited)
John Phillips
Role: Rear Admiral