Robert Lamoureux

Character: Arsène Lupin / Lieutenant André Laroche

Robert Dalban

Character: Inspector Béchoux of the Judicial Police

Alida Valli

Character: Aurélia Valéano

Jacques Dufilho

Character: Albert, manservant

Yves Robert

Character: La Ballu

Roger Dumas

Character: Isidore Bautrelet aka 'Véritaz'

Hubert de Lapparent

Character: French Consul in Florence

Jean Bellanger

Character: Sleeping car employee

Liliane Chenevière

Character:

Michel Etcheverry

Character: Van Nelden, collector

Jean Galland

Character: General

Gisèle Grandpré

Character: Madame du Bois-Lambert

Harold Kay

Character: Henri

Paul Müller

Character: Attaché of the French consulate in Florence

Ginette Pigeon

Character: Agnès, nurse

Anne Valon

Character:

Michel Vocoret

Character:

Gérard Darrieu

Character: Sidekick

Pierre Duncan

Character: (uncredited)

Gabriel Gobin

Character: SNCF employee (uncredited)

René Hell

Character: Prison guard (uncredited)

René Lefèvre-Bel

Character: (uncredited)

Judith Magre

Character: (uncredited)

Claude Mercutio

Character: (uncredited)

Paul Préboist

Character: Drunkard of Enghien (uncredited)

Robert Rollis

Character: Traveler on the train (uncredited)

Paul Villé

Character: Secretary of the archives (uncredited)