- Alastair Sim
- Prof. Ernst Kronak
- Fred Emney
- Sir George Denberry-Baxter
- Edward Rigby
- Timmy Tiverton
- Oliver Wakefield
- Sir Reginald Foxfield
- Patricia Roc
- Hope Ollerton
- Annie Esmond
- Lady Foxfield
- Marian Spencer
- Lady Shepshod
- Olive Sloane
- Daisy Barley
- Maire O'Neill
- Mrs. Mitterley
- Gus McNaughton
- Ketley
- Charles Hawtrey
- Young Orton
- Peter Gawthorne
- Maj. Shiptonthorpe
- Aubrey Mallalieu
- Cmdr. Spofforth
- G.H. Mulcaster
- Inspector
- Wally Patch
- Sam
- Horace Kenney
- Walter Shepton
- Morris Harvey
- Jim Flagg
- Ida Barr
- Katie
- Spencer Trevor
- Col. Hazelhead
- Robert Atkins
- Hassock
- Diana Beaumont
- Secretary
- Syd Crossley
- Uncle Alfred
- A. Bromley Davenport
- Agent
- Charles Doe
- Mayor
- Alexander Field
- Packles Junior
- Ian Fleming
- United Plastics Barrister
- Richard George
- Tom Largs
- Leopold Glasspoole
- Pelham
- Michael Martin Harvey
- Handover
- David Keir
- Mr. Finningley
- Henry B. Longhurst
- Bald-headed Man with Blonde
- Eliot Makeham
- Town Clerk
- George Merritt
- Police Sergeant
- Mignon O'Doherty
- Dr. Buckley
- Stan Paskin
- Attendant
- Peter Ustinov
- Dr. Bentika
- Joss Ambler
- Bit Role
- Frank Atkinson
- Bit Role
- Cecil Bevan
- Bit Role
- Beckett Bould
- Bit Role
- Lawrence Hanray
- Bit Role
- James Knight
- Bit Role
- Raymond Lovell
- Bit Role
- Arthur Maude
- Bit Role
- Billy Merson
- Bit Role
- Leonard Sharp
- Doorman at 'Dog and Bell'
- Robert Brooks Turner
- Bit Role
- Charles Victor
- Bit Role
- Jack Vyvyan
- Police Constable
- H Victor Weske
- (uncredited)
- Ben Williams
- Bit Role
