- Will Fyffe
- Capt. Ferguson
- Leslie Banks
- George Carter
- Yvonne Arnaud
- Rosa Pirenti
- Phyllis Calvert
- Helen Carter
- Hugh McDermott
- Jim Grey
- John Salew
- Wilson
- Cameron Hall
- Charlie Baxter
- Frederick Valk
- Captain Traumer
- Anthony Holles
- Chief of Police
- Sigurd Lohde
- German Consul
- Wally Patch
- Fred
- Dennis Wyndham
- Terry
- Jack Raine
- Alf
- Albert Lieven
- Capt. Grosskraft
- Mignon O'Doherty
- Miss Fleming
- Yvonne Andre
- (uncredited)
- Eric Clavering
- (uncredited)
- Cot D'Ordan
- (uncredited)
- Noel Dainton
- (uncredited)
- Anton Diffring
- Sailor
- Rowland Douglas
- (uncredited)
- Hugh Griffith
- Spaniard
- Frank Henderson
- (uncredited)
- Howard Lang
- German Naval Officer
- Stuart Latham
- (uncredited)
- Sam Lee
- (uncredited)
- Ernest Metcalfe
- (uncredited)
- John Rae
- Seaman on 'Annie Louise'
- Charles Rolfe
- Radio Operator on 'Annie Louise'
- Gerik Schjelderup
- Heinrich
- Leonard Sharp
- Seaman on 'Annie Louise'
- Keith Shepherd
- (uncredited)
