Jean Dujardin as Picquart

Louis Garrel as Alfred Dreyfus

Emmanuelle Seigner as Pauline Monnier

Grégory Gadebois as Henry

Hervé Pierre as General Gonse

Wladimir Yordanoff as General Mercier

Didier Sandre as General Boisdeffre

Melvil Poupaud as Maître Labori

Eric Ruf as Sandherr

Mathieu Amalric as Bertillon

Laurent Stocker as General de Pellieux

Vincent Perez as Maître Leblois

Michel Vuillermoz as Du Paty de Clam

Vincent Grass as General Billot

Denis Podalydès as Maître Demange

Damien Bonnard as Desvernine

Laurent Natrella as Esterhazy

Bruno Raffaelli as Judge Delegorgue

Christophe Maratier as Warrant Officer

Pierre Poirot as Vallecalle Clerk

Stefan Godin as General Darras

Yannik Landrein as Gast

Luca Barbareschi as Philippe Monnier

Mohammed Lakhdar-Hamina as Bachir

Kevin Garnichat as Lauth

Vincent de Boüard as Gribelin

Luce Mouchel as Madame Sandherr

Fabien Tucci as Security Officer

Fred Epaud as Artillery Officer

Nicolas Wanczycki as Foucault

Franck Mercadal as Captain Calmont

Philippe Magnan as Attorney Brisset

Pierre Forest as Colonel Maurel

Édith Le Merdy as Concierge

Jeanne Rosa as Martha Leblois

Benoît Allemane as Georges Charpentier

Ludovic Paris as Senator Ranc

Gérard Chaillou as Georges Clémenceau

Nicolas Bridet as Mathieu Dreyfus

André Marcon as Émile Zola

Pierre Aussedat as Colonel at Picquart's Arrest

Rafaël de Ferran as Newspaper Seller

Jean-Marie Frin as Judge Delegorgue

Swan Starosta as Lucie Dreyfus

Jean-Gilles Barbier as Duel Arbiter

Jean-Marie Lecoq as Duel Doctor

Thierry Gimenez as Colonel Jouaust

Clément Jacqmin as Journalist

Boris Ventura-Diaz as Journalist

Lionel Mur as Journalist

Raphaël Caraty as Journalist

Yves-Pol Deniélou as Journalist

Élodie Auger as Dancer

Margritte Gouin as Dancer

Élodie Lobjois as Dancer

Mélanie Malet as Dancer

Carole Mongin as Dancer

Laurine Ristroph as Dancer

Thibault Signovert as Musician

Valentin Cotton as Musician

Florian Blot as Musician

Adrien Boulanger as Musician

Julien Francomano as Musician

Camille-Raphaël Bérard as Musician

Marc Legrand as Musician

Jean-Baptiste Souchon as Musician

Emmanuel Borghi as Musician

Jérome Duhamel as Musician

Patrick Perrin as Musician

Jean-Jacques Breniaud as Gunner

Benjamin Dubos as Gunner

Romain Mestre as Gunner

Guy Chaillaud as Gunner

Charles Lapierre as Gunner

Mickael Cartier as Gunner

Brigitte Boucher as Marie Bastian (uncredited)

Mathieu Cayrou as Private Dugommier (uncredited)

Michèle Clément as Washerwoman (uncredited)

Nicolas de Lavergne as Auguste Dutrieux (uncredited)

Benjamin Gouzien as Joseph Reinach (uncredited)

Pierre Hurel as Man (uncredited)

Romain Lehnhoff as Gunner (uncredited)

Pierre Léon Luneau as Captain Valdant (uncredited)

Roman Polanski as Concertgoer (uncredited)

Charles Tesnière as Officer (uncredited)

Antoine Zerbini as Soldier (uncredited)