- Derek Nimmo
- Lord Southmere
- Hugh Burden
- Haines
- Bernard Bresslaw
- Fan Choy
- Helen Hayes
- Hettie
- Joan Sims
- Emily
- Deryck Guyler
- Harris
- Peter Ustinov
- Hnup Wan
- Clive Revill
- Quon
- Molly Weir
- Scots Nanny
- Andrew Dove
- Lord Castleberry
- Max Harris
- Truscott
- Max Wall
- Juggler
- Natasha Pyne
- Susan
- Joss Ackland
- B.J. Spence
- Arthur Howard
- Thumley
- Roy Kinnear
- Superintendent Grubbs
- Leonard Trolley
- Inspector Eppers
- Joe Ritchie
- Cabbie
- Percy Herbert
- Mr. Gibbons
- Joan Hickson
- Mrs. Gibbons
- John Laurie
- Jock
- Angus Lennie
- Hamish
- Jon Pertwee
- Colonel
- Kathleen Byron
- Colonel's Wife
- Lucy Griffiths
- Amelia
- Aimée Delamain
- Millicent
- John Bardon
- Bookmaker
- Jane Lapotaire
- Miss Prescott
- Richard Pearson
- Sir Geoffrey
- Michael Elwyn
- Haycock
- Anthony Sharp
- Home Secretary
- Wensley Pithey
- Bromley
- Frank Williams
- Dr. Freemo
- Peter Madden
- Sanders
- Erik Chitty
- Museum Guard
- Amanda Barrie
- Mrs. B.J. Spence
- Dave Cooper
- Henchman
- Chick Fowles
- Curator
- Victor Harrington
- MP
- Alan Harris
- Policeman
- Arthur Hewlett
- Old Gatekeeper
- Frederick Jaeger
- German Radio Newcaster
- Kristopher Kum
- Henchman
- Monique Potter
- Little Girl
- Joan Sanderson
- 1st Park Nanny
- Patsy Smart
- Old Maid
- Robert Stevenson
- (uncredited)
- Vincent Wong
- Fake Chauffeur
