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