 | Kit Harington als John F. Donovan |
 | Jacob Tremblay als Rupert Turner |
 | Natalie Portman als Sam Turner |
 | Ben Schnetzer als Adult Rupert Turner |
 | Thandiwe Newton als Audrey Newhouse |
 | Susan Sarandon als Grace Donovan |
 | Amara Karan als Mrs. Kureishi |
 | Chris Zylka als Will Jefford Jr. |
 | Emily Hampshire als Amy Bosworth |
 | Jared Keeso als James Donovan |
 | Kathy Bates als Barbara Haggermaker |
 | Michael Gambon als Man in Diner |
 | Sarah Gadon als Liz Jones |
 | Dakota Jamal Wellman als Eric |
 | Susan Almgren als Aunt Faith |
 | Leni Parker als Bonnie |
 | Ari Millen als Billy |
 | Katy Breier als Trish |
 | Ellen David als Adam's Mother |
 | Alison Louder als Hellsome High Actress |
 | Matthew Raudsepp als Hellsome High Actor |
 | Harry Strandjofski als Producer |
 | Trevor Hayes als Director |
 | Pat Kiely als Director #2 |
 | Brent Skagford als Editor #1 |
 | Sangita Patel als Journalist #3 |
| Lukas Rolfe als Cedric James |
 | Jane Wheeler als Aunt Anne |
 | Craig Eldridge als Uncle Patrick |
 | Carolyn Fe als Porter |
 | Connor McMahon als Sasha |
 | Holly Bernier als Journalist #2 |
 | Hamza Haq als Journalist #4 |
 | Niko Nikolov als Security Guard |
| Patrick Allard als Club Boy #1 |
 | Pierre-Luc Lafontaine als Fan in the Club |
 | Gijs Blom als Rupert's Boyfriend |
 | Sam Taylor Buck als Young Daniel |
 | Daniel Murphy als Editor #2 |
| Xavier Dolan | Director |
| Jacob Tierney | Writer |
| Xavier Dolan | Screenplay |
| Nancy Grant | Producer |
| Colombe Raby | Production Design |
| Yves Desjardins | Production Coordinator |
| Jean-François Ferland | Visual Effects Supervisor |
| Charles-Olivier Tremblay | Art Department Assistant |
| Lucie Tremblay | Set Designer |
| Marie-Claude Lafontaine | Visual Effects Coordinator |
| Xavier Dolan | Producer |
| Marianne Messier Petit | Transportation Coordinator |
| Lyse Lafontaine | Producer |
| Denis Lamothe | Gaffer |
| Liana Dee | Production Accountant |
| Réal Hamel | Picture Car Coordinator |
| Peter Carlton | Co-Producer |
| Benoît Mathieu | Location Manager |
| Christian Fluet | Production Accountant |
| Barry Ryan | Co-Producer |
| Xavier Dolan | Editor |
| Michele Clapton | Costume Design |
| Pierre-Yves Gayraud | Costume Design |
| Mathieu Denis | Editor |
| André Turpin | Cinematography |
| Denis Vidal | Key Hair Stylist |
| Pierre Perrault | Art Direction |
| Carmen Cuba | Casting Director |
| Gabriel Yared | Original Music Composer |
| Kathy Kelso | Key Makeup Artist |
| Xavier Dolan | Costume Design |
| Julie Brisebois | Makeup Artist |
| Linda Dowds | Makeup Artist |
| Sjaan Gillings | Makeup Supervisor |
| Sian Grigg | Makeup Artist |
| Scott Hersh | Makeup Artist |
| Kathy Kelso | Makeup Department Head |
| Camiel McLean | Makeup Artist |
| Maïna Militza | Makeup Artist |
| Sylvain Brassard | Sound Re-Recording Mixer |
| Sylvain Brassard | ADR Editor |
| Sylvain Brassard | Supervising Sound Editor |
| Sylvain Brassard | Sound Effects Editor |
| Sylvain Brassard | Sound Designer |
| Jean-Charles Liozu | Sound Re-Recording Mixer |
| Jean-Philippe Savard | Sound Effects Editor |
| Frédérique Bolté | Set Decoration |
| Pascale Deschênes | Set Decoration |
| Susan Raney | Set Decoration |
| Sébastien Thivierge | Set Decoration |
| Patrick Binette | Set Dresser |
| Louis Cyr | Set Dresser |
| Raymond Larose | Set Designer |
| Anna Mayerová | Set Designer |
| Benoit Robitaille | Set Dresser |
| Georges Samuel | Set Dresser |
| Radia Slaimi | Set Designer |
| Lenka Koutková | Costume Supervisor |
| Heather Leat | Costume Supervisor |
| Suzanne Pakier | Costume Supervisor |
| Karel Bocek | Set Costumer |
| Robert Bock | Visual Effects Supervisor |
| Annie Cliche | Visual Effects Producer |
| Ismaël Gros | VFX Artist |
| Alain Lachance | VFX Artist |
| Marie-Claude Lafontaine | Visual Effects Producer |
| James Price | Art Direction |
| Nicholas DeWitt | Location Assistant |
