Noël Coward
Captain E. V. Kinross R.N. / Captain 'D'
John Mills
Ordinary Seaman Blake / Shorty Blake
Bernard Miles
Chief Petty Officer Hardy / Walter Hardy
Celia Johnson
Mrs. Kinross / Alix
Kay Walsh
Freda Lewis / Freda
Joyce Carey
Mrs. Hardy / Kath
Derek Elphinstone
No. 1
Michael Wilding
Flags
Robert Sansom
Guns
Philip Friend
Torps
Chimmo Branson
Midshipman
Ballard Berkeley
Engineer Commander
Hubert Gregg
Pilot
James Donald
Doc
Michael Whittaker
Sub
Kenneth Carten
Sub-Lieutenant R.N.V.R.
John Varley
Secco
Caven Watson
Brodie
Geoffrey Hibbert
Joey Mackeridge
Richard Attenborough
Young Stoker
Frederick Piper
Edgecombe
Lionel Grose
Reynolds
Leslie Dwyer
Parkinson
Charles Russell
Fisher
John Singer
Moran
Robert Moreton
Coombe
John Boxer
Hollett
Kenneth Evans
Posty
Johnnie Schofield
Coxswain
Franklyn Bennett
Commander Spencer
Charles Compton
№ 1. "Tremoyne"
Walter Fitzgerald
Colonel Lumsden
Gerald Case
Jasper
Daniel Massey
Bobby Kinross
Ann Stephens
Lavinia Kinross
Kathleen Harrison
Mrs. Blake
Dora Gregory
Mrs. Lemmon
Penelope Dudley-Ward
Maureen
Barbara Waring
Mrs. Macadoo
Eileen Peel
Mrs. Farrell
Lesley Osmond
Nell Fosdick
Josie Welford
Emily
Kay Young
Barmaid
Trixie Scales
Mona Duke
George Carney
Mr. Blake
Wally Patch
Uncle Fred
Michael Anderson
Albert Fosdick
Jill Stephens
May Blake
Everley Gregg
Nurse
Roddy Hughes
Photographer
Norman Pierce
Mr. Satterthwaite
Juliet Mills
Freda's Baby
Leslie Howard
Narrator (voice) (uncredited)