Diamonds for Breakfast

Marcello Mastroianni

— Grand Duke Nicholas Wladimirovitch Goduno

Rita Tushingham

— Bridget Rafferty

Elaine Taylor

— Victoria

Margaret Blye

— Honey

Warren Mitchell

— Popov

Leonard Rossiter

— Inspector Dudley

Bill Fraser

— Bookseller

Bryan Pringle

— Police Sergeant

Francesca Tu

— Jeanne Silkingers

David Horne

— Duke of Windemere

Charles Lloyd Pack

— Butler

Anne Blake

— Nashka

David Webb

Juba Kennerley

— Casino Patron (uncredited)

Ian Trigger

— Popov's assistant (uncredited)

Norman Mitchell

— (uncredited)

Nora Nicholson

— Anastasia Petrovna

Rosalind Knight

— Museum Visitor in Pink Dress (uncredited)