Mr. Topaze

Peter Sellers

Auguste Topaze

Nadia Gray

Suzy

Herbert Lom

Castel Benac

Leo McKern

Muche

Billie Whitelaw

Ernestine

Michael Gough

Tamise

Joan Sims

Colette

John Le Mesurier

Blackmailer

John Neville

Roger

Martita Hunt

Baroness

Pauline Shepherd

Lilette

Michael Sellers

Gaston

Anne Leon

Mrs. Tamise

Thomas Gallagher

Policeman (uncredited)