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.

Alexis Kanner

Garrett

Robin Hawdon

Williams

Esma Cannon

Consul's Wife

Kenneth Griffith

Orator

Robert Nichols

Bill

Neil McCarthy

Sergeant

Tutte Lemkow

Corporal

Laurence Naismith

Admiral Blake

Andrew Cruickshank

Admiral Filmer

Walter Fitzgerald

Admiral Thomas

Ronald Leigh-Hunt

Commander R.N.

Jeremy Lloyd

The Midshipman/Dewberry

Dinsdale Landen

The Midshipman/Bowles

Michael Bentine

Psychologist

Rodney Bewes

Recruitment Interviewee (uncredited)

Dirk Bogarde

Dr. Simon Sparrow (uncredited)

Graham Crowden

Naval Officer (uncredited)

Andrew Sachs

Short-Changed US Seaman

Guy Standeven

American Naval Officer (uncredited)

Richard Vernon

Government Official at Enquiry (uncredited)

David Warner

Sailor Painting Ship (uncredited)

John Phillips

Rear Admiral