Nathalie Baye as Marie-Hélène Dumoulin / Marie-Octobre

Xavier Beauvois as Marc Donizzi

Samuel Labarthe as Robert Cabris

Etienne Chicot as Lucien Issard

Jacques Spiesser as Roland Herbelin

Alain Fromager as Claude Thieville

Gisèle Casadesus as Clémence

Laurent Gamelon as Guillaume Ferronnier

Sam Karmann as Raoul de Saint-Maur

Stéphan Guérin-Tillié as Claude Duroy

Philippe Magnan as Jérôme Massenet