Guillaume Canet as Julien Janvier

Marion Cotillard as Sophie Kowalsky

Thibault Verhaeghe as 8-year-old Julien

Joséphine Lebas-Joly as 8-year-old-Sophie

Emmanuelle Grönvold as Julien's Mother

Gérard Watkins as Julien's Father

Julia Faure as Sophie's Sister

Gilles Lellouche as Sergei Nimov Nimovitch

Élodie Navarre as Aurélie Miller

Frédéric Geerts as Igor

Isabelle Delval as Clothilde

Jean-Michel Flagothier as Dorzac

Laëtizia Venezia Tarnowska as Christelle Louise Bouchard

Nathalie Nattier as 80-year-old Sophie

Robert Willar as 80-year-old Julien

Manuela Sanchez as Teacher

Philippe Drecq as School Principal

Luc Bromagne as Priest

Stéphane Auberghen as Proctor

Christophe Rossignon as Doctor #2

Nathalie Philip as Julien's Nurse

Delphine Aerts as Senior Center Nurse

Isabelle Goethals Carre as Senior Center Director

Mathilde Verkinderen as 8-year-old Charlotte

Melchior Lebeaut as 4-year-old Julien

Emmanuel LeMire as Doctor #1

Jessica Rinalo as Child

Emmanuel Brunin as Child

Joeffrey Simon as Child

Amandine Courrire as Child

Jessica Vitello as Child

Michel Angely as Bus Driver

Fernand Kindt as Scrabble Player

Cédric Lombard as Library Student

Ingrid Juveneton as Sylvie