- Jean-Pierre Léaud as Antoine Doinel
- Claude Jade as Christine Darbon
- Daniel Ceccaldi as Christine's father
- Claire Duhamel as Christine's mother
- Delphine Seyrig as Fabienne Tabard
- Michael Lonsdale as Georges Tabard
- Harry-Max as Monsieur Henri
- André Falcon as Monsieur Blady, Manager of the private detective agency
- Catherine Lutz as Catherine
- Martine Ferrière as Gérante
- Jacques Rispal as Monsieur Colin
- Serge Rousseau as The unknown man
- Paul Pavel as Julien
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- Jacques Delord as the Conjuror
- Roger Trapp as the Hotel manager
- Jacques Rispal as M. Colin
- Martine Brochard as Mme. Colin
- Robert Cambouakis as Mme. Colin's lover
- François Darbon as Adjudant Picard
- Albert Simono as Albani
- Marie-France Pisier as Colette Tazzi
- Jean-François Adam as Albert Tazzi
- Christine Pellé as the secretary at the Blady agency
- Jacques Robiolles as a writer
- Marcel Mercier as a man at the garage
- Joseph Merieau as a man at the garage
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