Lady L

Sophia Loren

Lady Louise Lendale / Lady L

Paul Newman

Armand Denis

David Niven

Dicky, Lord Lendale

Peter Ustinov

Prince Otto of Bavaria

Marcel Dalio

Sapper

Michel Piccoli

Lecoeur

Claude Dauphin

Inspector Mercier

Cecil Parker

Sir Percy

Philippe Noiret

Ambroise Gérôme

Jacques Dufilho

Bealu

Eugene Deckers

Koenigstein

Daniel Emilfork

Kobeleff

Hella Petri

Madam

Jean Wiener

Krajewski

Roger Trapp

Police Inspector Dubaron

Jean Rupert

Joe Dassin

Police inspector

Jacques Legras

Police inspector

Mario Feliciani

Italian anarchist

Sacha Pitoëff

Bomb-throwing revolutionary

Arthur Howard

Butler

Dorothy Reynolds

Jacques Ciron

Hazel Hughes

Tanya Lopert

Agneau (uncredited)