Signé Arsène Lupin: Reparto
Robert Lamoureux
Arsène Lupin / Lieutenant André Laroche
Robert Dalban
Inspector Béchoux of the Judicial Police
Alida Valli
Aurélia Valéano
Jacques Dufilho
Albert, manservant
Yves Robert
La Ballu
Roger Dumas
Isidore Bautrelet aka 'Véritaz'
Hubert de Lapparent
French Consul in Florence
Jean Bellanger
Sleeping car employee
Michel Etcheverry
Van Nelden, collector
Jean Galland
General
Gisèle Grandpré
Madame du Bois-Lambert
Harold Kay
Henri
Paul Müller
Attaché of the French consulate in Florence
Ginette Pigeon
Agnès, nurse
Gérard Darrieu
Sidekick
Pierre Duncan
(uncredited)
Gabriel Gobin
SNCF employee (uncredited)
René Hell
Prison guard (uncredited)
René Lefèvre-Bel
(uncredited)
Judith Magre
(uncredited)
Claude Mercutio
(uncredited)
Paul Préboist
Drunkard of Enghien (uncredited)
Robert Rollis
Traveler on the train (uncredited)
Paul Villé
Secretary of the archives (uncredited)