Kenneth More

Lt. Cmdr. Robert Badger

Lloyd Nolan

Vice Admiral Ryan

Joan O'Brien

Lt. Carol Blair

Derek Fowlds

Carson

John Le Mesurier

George Dewberry Sr.

Brian Wilde

Petty Officer Gilors

Warren Mitchell

'Honest' Marcel

Wanda Ventham

Dartmouth Girl

Sid James

Dance Instructor

Mischa Auer

Colonel & President

Paul Maxwell

Commander Spelling U.S.N.

Nicholas Stuart

Captain Hurley U.S.N.

Sean Kelly

Simpson

Alexis Kanner

Garrett

Robin Hawdon

Williams

John Barrard

Consul

Esma Cannon

Consul's Wife

Kenneth Griffith

Orator

Marie France Dousset

Françoise

Michael Kilgarriff

Claude

Robert Nichols

Bill

Neil McCarthy

Sergeant

Tutte Lemkow

Corporal

Lally Bowers

Mrs. Dewberry

Laurence Naismith

Admiral Blake

Andrew Cruickshank

Admiral Filmer

Walter Fitzgerald

Admiral Thomas

Ronald Leigh-Hunt

Commander R.N.

Arthur Lovegrove

C.P.O. Froud

Jeremy Lloyd

The Midshipman/Dewberry

Dinsdale Landen

The Midshipman/Bowles

Michael Bentine

Psychologist

Rodney Bewes

Recruitment Interviewee (uncredited)

Dirk Bogarde

Dr. Simon Sparrow (uncredited)

Peter Brace

Leather Jacket Rebel (uncredited)

Robert Cawdron

Marcel's Bar Patron (uncredited)

Graham Crowden

Naval Officer (uncredited)

Bill Hibbert

Revolutionary (uncredited)

Andrew Sachs

Short-Changed US Seaman

Ian Selby

Shocked Man in Cafe (uncredited)

Guy Standeven

American Naval Officer (uncredited)

Richard Vernon

Government Official at Enquiry (uncredited)

David Warner

Sailor Painting Ship (uncredited)

John Phillips

Rear Admiral