Un éléphant ça trompe énormément

Claude Brasseur

Daniel

Jean Rochefort

Étienne / Etienne Dorsay

Christophe Bourseiller

Lucien

Marthe Villalonga

Mouchy Messina / Mouchy Messina, Simon's possessive mother

Victor Lanoux

Bouly / Boulifet, aka 'Bouly'

Danièle Delorme

Marthe Dorsay / Marthe Dorsay, Étienne's wife

Guy Bedos

Simon / Simon Messina, doctor

Pascale Reynaud

Delphine / Delphine, Étienne's younger daughter

Anne-Marie Blot

Marie-Ange / Marie-Ange, Bouly's ex-wife

Catherine Verlor

Stéphanie / Stéphanie, Étienne's older daughter

Josiane Balasko

Josy, Lucien's girlfriend

Anémone

Concierge

Anny Duperey

Charlotte

Daniel Gélin

Bastien, stage director

Claude Carliez

Man Slapping Simon (uncredited)

Vladimir Cosma

Violinist at Mouchy's party (uncredited)

Vania Vilers

Banoît, Marthe's lover

Elisabeth Margoni

Daisy, Bouly's fiancée

Bernard Charlan

Fire Captain (uncredited)

Maurice Bénichou

Gonthier

Jenny Arasse

Bernadette, designer collaborating with Étienne

Jean Lescot

Worried Patient

Richard Saint-Bris

Charles

Jean-Pierre Castaldi

Bully

Maurice Illouz

Bartender (uncredited)

Jean-Paul Solal

Charlotte's Husband (uncredited)

Martine Sarcey

Esperanza

Gaby Sylvia

Marie-Christine Bosquet, Daniel's director

Janine Souchon

Bouly's secretary

Jean-François Dérec

Man Who Alerts Firefighters (uncredited)