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)

Christopher Morahan