Anna Neagle as Sally Maitland

Richard Greene as Lieutenant Commander Jim Garrick

Nova Pilbeam as Betty Maitland

Albert Lieven as Jan Orlock

Lucie Mannheim as Madame Orlock

George Thorpe as Colonel Charles Hargraves

Marjorie Fielding as Lady Maitland

Franklin Dyall as Captain Foster

Margaret Rutherford as Mrs. Towcester

Claude Bailey as Major Fothergill

Valentine Dyall as German Commander

Sybille Binder as Madame Orlock's Attendant

Cyril Fletcher as And Introducing Entertainer

Leslie Dwyer as Ship's Steward

Ian Fleming as Observe Corpsman in Opening Scene

David Horne as Admiral

Eliot Makeham as Observer Corpsman in Opening Scene

Aubrey Mallalieu as Reynolds

Paul Dupuis as Intelligence Officer