Maxime Godart as Nicolas

Valérie Lemercier as La mère de Nicolas

Kad Merad as Le père de Nicolas

Sandrine Kiberlain as La maîtresse

François-Xavier Demaison as Le Bouillon

Michel Duchaussoy as Le directeur

Daniel Prévost as M. Moucheboume

Michel Galabru as Le ministre

Anémone as Mlle Navarin

Louise Bourgoin as La fleuriste

Gérard Jugnot as Le chef de la chorale

Vincent Claude as Alceste

Charles Vaillant as Geoffroy

Victor Carles as Clotaire

Benjamin Averty as Eudes

François Damiens as Blédurt

Germain Petit Damico as Rufus

Virgile Tirard as Joachim

Éric Berger as Le majordome

Marc Faure as Médecin 3

Françoise Bertin as La dame à la roulette

Nathalie Cerda as Madame Moucheboume

Cyril Couton as L'oncle de Nicolas

Virginia Anderson as La secrétaire (non créditée)

Didier Raymond as Médecin 1

Christian Taponard as Médecin

Alain Sachs as Médecin 2

Yves-Robert Viala as Médecin 4

Elisa Heusch as Marie Edwige

Damien Ferdel as Agnan

Simon Goscinny du Chatenet as Un élève salle des examens

Serge Riaboukine as Francis Leborgne

Renaud Rutten as le moniteur d'auto-école

Tristan Aquilina as (uncredited)

Éric Berger as Albert le majordome

Jean-Michel Lahmi as Le gangster

Nicolas Vallée as Le flic

Laura Boujenah as La sage-femme