 | Hugh Jackman als Peter Miller |
 | Zen McGrath als Nicholas Miller |
 | Vanessa Kirby als Beth |
 | Laura Dern als Kate Miller |
 | Anthony Hopkins als Anthony Miller |
 | William Hope als Andrew |
 | George Cobell als Nicholas (6 Years) |
| Felix Goddard als Theo |
| Max Goddard als Theo |
 | Shin-Fei Chen als Alexandra |
 | Nancy Baldwin als Principal's Secretary |
 | Akie Kotabe als Mr. Yama |
 | Isaura Barbé-Brown als Sophia |
 | Erick Hayden als Allan |
 | Joseph Mydell als Brian |
 | Rachel Handshaw als Brian's Assistant |
| Gabriel Ecoffey als Intern |
| Stephanie Palies als Assistant |
 | George Potts als Therapist |
 | Reza Diako als Waiter |
| Yolanda Nieto als Maria |
 | Danielle Lewis als Jessica |
 | Gretchen Egolf als E.R. Psychiatrist |
 | Alex Mugnaioni als Nurse |
 | Hugh Quarshie als Doctor Harris |
| Mercedes Bahleda als Mary (uncredited) |
| Van Pierre als Steven (uncredited) |
 | Jesse Cilio als Bailey (uncredited) |
| Patrice Bevans als Attorney in Peter's Office (uncredited) |
 | Rene Costa als Hospital Attendant (uncredited) |
 | Joakim Skarli als Boardroom Executive (uncredited) |
| Julia Westcott-Hutton als Boardroom Executive (uncredited) |
 | Kenny-Lee Mbanefo als Boardroom Executive (uncredited) |
| Riccardo Mazzi als Business Executive Staff (uncredited) |
| Darren J Clarke als Lawyer (uncredited) |
| Florian Zeller | Director |
| Hugh Jackman | Executive Producer |
| Simon Gillis | Executive Producer |
| Daniel Battsek | Executive Producer |
| Lauren Dark | Executive Producer |
| Ollie Madden | Executive Producer |
| Philippe Carcassonne | Executive Producer |
| Tim Haslam | Executive Producer |
| Hugo Grumbar | Executive Producer |
| Ben Smithard | Director of Photography |
| Nicola Chisholm | Casting |
| Simon Bowles | Production Design |
| Caroline Story | Supervising Art Director |
| Lisa Duncan | Costume Design |
| Niv Adiri | Sound Re-Recording Mixer |
| Karl Hartman | Producer |
| Joanna Laurie | Producer |
| Cass Marks | Line Producer |
| Emile Sherman | Producer |
| Christophe Spadone | Producer |
| Florian Zeller | Producer |
| Christelle Conan | Executive Producer |
| Peter Touche | Executive Producer |
| Christopher Hampton | Screenplay |
| Florian Zeller | Screenplay |
| Florian Zeller | Theatre Play |
| Hans Zimmer | Original Music Composer |
| Peter Owen Brook | Assistant Editor |
| Chris Francis | Additional Colorist |
| Molly MacCormack | Color Assistant |
| Leigh Myers | Finishing Producer |
| Jamie D. Allen | Second Assistant Director |
| Benjamin Dol | Third Assistant Director |
| George Every | First Assistant Director |
| Pippa Feldberg Collins | Third Assistant Director |
| Nick Flavin | Second Second Assistant Director |
| Kat Hess | Second Assistant Director |
| Eric LaFranchi | First Assistant Director |
| Paul Kennington | Stunt Coordinator |
| Marnie Fitzpatrick | Costume Supervisor |
| Felicity Goldsworthy | Costume Standby |
| Carly Griffith | Assistant Costume Designer |
| Lisa Harlow-Powell | Wardrobe Supervisor |
| Harriet Town | Costume Standby |
| Tomas Piekus | Transportation Captain |
| Susanna Lenton | Script Supervisor |
| Laura Petoin | Additional Script Supervisor |
| Julie Robinson | Script Supervisor |
| Michel Bouquerel | Gaffer |
| Anabel Caicedo | Second Assistant "B" Camera |
| Mauro Calanca | First Assistant "B" Camera |
| Arthur Chamaillard | Grip |
| Kristin Davis | Digital Imaging Technician |
| Andy DeAngelo | Grip |
| Nicolas Eon | Key Grip |
| Rekha Garton | Still Photographer |
| Jean-Charles Granjon | Underwater Camera |
| Sean Patrick Henderson | Dolly Grip |
| Gabriel Hyman | First Assistant "A" Camera |
| Dave Isern | Steadicam Operator |
| Elizabeth Khan-Greig | Second Assistant Camera |
| Jessica Kourkounis | Still Photographer |
| Katie Morrissey | Key Grip |
| Jack S. O'Leary | Camera Trainee |
| Joseph Robinson | Second Assistant "A" Camera |
| Sol Saihati | Gaffer |
| Vincent Toubel | First Assistant Camera |
| Clément Valette | Electrician |
| Susan Leber | Line Producer |
| Katherine Bridle | Associate Producer |
| Iain Canning | Producer |
| Christophe Jeauffroy | Line Producer |
| Niv Adiri | Sound Designer |
| Alistair Bolt | ADR Mixer |
| Andrea Cremonini | Second Assistant Sound |
| Mark DeSimone | ADR Mixer |
| Tammy Douglas | Sound Mixer |
| Linda Forsén | ADR Supervisor |
| Ryan Hill | First Assistant Sound Editor |
| David Fleming | Additional Music |
| Yorgos Lamprinos | Editor |
