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
Liliane Chenevière
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
Anne Valon
Michel Vocoret
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)
Yves Robert
Director
Robert Clavel
Production Design
Robert Sussfeld
Production Manager
François Chavane
Executive Producer
Moris Ergas
Executive Producer
Alain Poiré
Producer
Jean Magis
Still Photographer
Simone Knapp
Hairstylist
Mary Greco
Third Assistant Director
Michel Deruelle
Makeup Artist
Charles-Henri Montel
Camera Operator
Jules Borkon
Executive Producer
Mario Gabrielli
Producer
Jean Le Duc
Producer
Jean-Marie Maillols
Camera Operator
Gilbert Natot
Editor
Georges Van Parys
Music
Roland Paillas
Assistant Camera
Georgette Fillon
Costume Design
Jacques Besnard
Second Assistant Director
Robert Biart
Sound Recordist
Hubert Mérial
Unit Production Manager
Georges Casati
First Assistant Director
Renato Cadueri
Sound
Maurice Barry
Director of Photography
Georges Van Parys
Original Music Composer