Trailer
 | Jacob Tremblay as Auggie |
 | Julia Roberts as Isabel |
 | Owen Wilson as Nate |
 | Izabela Vidovic as Via |
 | Noah Jupe as Jack Will |
 | Millie Davis as Summer |
 | Bryce Gheisar as Julian |
 | Mandy Patinkin as Mr. Tushman |
 | Danielle Rose Russell as Miranda |
 | Daveed Diggs as Mr. Browne |
 | Mark Dozlaw as Teenage Doctor |
 | Rukiya Bernard as Nurse |
 | Jennifer March as Neonatologist |
 | Elle McKinnon as Charlotte |
 | Ty Consiglio as Amos |
 | Kyle Breitkopf as Miles |
 | James A Hughes as Henry |
| J. Douglas Stewart as Darth Sidious |
 | Ali Liebert as Ms. Petosa |
| Joseph Gordon as Dodgeball Player |
 | Cameron Roberts as Cute Guy |
| Erika McKitrick as Ella |
 | Nadji Jeter as Justin |
 | Ben Immanuel as Mr. Davenport |
 | Jason McKinnon as School Photographer |
| Izzy Lieberman as Reid |
| Hannah Hoberman as Rebecca |
| Michael Alan Healy as Chewbacca |
 | Sonia Braga as Grans |
 | Nicole Oliver as Jack Will's Mom |
 | Emily Delahunty as Ximena Chin |
| Lucia Thain as Savanna |
 | Sasha Neuhaus as Maya |
 | Rachel Hayward as Miranda's Mom |
| Callahan Brebner as Guy on Bus |
| Caleb Gordon as Our Town Player |
 | Grayson Maxwell Gurnsey as Our Town Player |
| Emily Giannozio as Our Town Player |
| Haley Goldin as Our Town Player |
| Maccie Margaret Chbosky as Via (Age 4) |
| Victoria V. Cruz as Science Fair Judge |
 | Yan-Kay Crystal Lowe as Julian's Mom |
 | Steve Bacic as Julian's Dad |
 | Jason Tremblay as Camp Counsellor |
| William Dickinson as Eddie |
 | Emma Tremblay as Michelle |
| Armen Bagdasarov as Danny |
 | Lidya Jewett as Lina Annan |
| Kaelyn Breitkopf as Angela |
| Brayden Snow as Classmate (uncredited) |
 | Andre Robinson as School Kid (uncredited) |
| Alyssa Andronyk as School Kid (uncredited) |
| Wilson Chieng as Simon Stimson (uncredited) |
| Dallas Snow as Classmate (uncredited) |
| Justin Snow as Classmate (uncredited) |
| Kayzhia Snow as Classmate (uncredited) |
| Amber Snow as Classmate Parent (uncredited) |
| Elayna Sing as Classmate (uncredited) |
| Ann Evans as Parent (uncredited) |
| Abigail Friend as Daughter at Coney Island Beach (uncredited) |
| Razvan Orban as Boy in Red (uncredited) |
| Kari Staten as Parent (uncredited) |
| Sound | |
| Marcelo Zarvos | Original Music Composer |
| Will Ropp | ADR & Dubbing |
Directing | |
| Stephen Chbosky | Director |
Production | |
| David Hoberman | Producer |
| Todd Lieberman | Producer |
Editing | |
| Mark Livolsi | Editor |
Writing | |
| Steven Conrad | Screenplay |
| R.J. Palacio | Novel |
Camera | |
| Don Burgess | Director of Photography |
Production | |
| Deborah Aquila | Casting |
| Kara Eide | Casting |
| Tricia Wood | Casting |
| Kris Woznesensky | Casting |
Art | |
| Kalina Ivanov | Production Design |
| Kendelle Elliott | Art Direction |
| Shannon Gottlieb | Set Decoration |
Costume & Make-Up | |
| Monique Prudhomme | Costume Design |
Art | |
| Gina MacKay | Art Department Coordinator |
| Craig Henderson | Construction Coordinator |
| Dean Eilertson | Property Master |
Directing | |
| Keilah Boyle | Continuity |
| Susan Lambie | Script Supervisor |
| Stephanie Moore | Script Coordinator |
Crew | |
| Steve Woodley | Animal Coordinator |
Costume & Make-Up | |
| Alison Fraser | Assistant Costume Designer |
| Luisa Dalmagro | Costume Coordinator |
| Kayla Straub | Set Costumer |
Production | |
| Jessica Aquila Cymerman | Casting Assistant |
| Katherine McArdle | Casting Assistant |
Camera | |
| Peter Wilke | Steadicam Operator |
| Dale Robinette | Still Photographer |
Lighting | |
| John Dekker | Gaffer |
Camera | |
| Darin Wong | Dolly Grip |
| Julian Chapdelaine | Dolly Grip |
| Reid Cohoon | Key Grip |
Visual Effects | |
| John Stewart | Visual Effects Supervisor |
Sound | |
| Michael Leder | Boom Operator |
| Kevin Zimmerman | Sound Editor |
| Perry Robertson | Supervising Sound Editor |
| Scott Sanders | Supervising Sound Editor |
Costume & Make-Up | |
| Robert A. Pandini | Hair Department Head |
| Aimee Macabeo | Hair Supervisor |
| Ailsa Macmillan | Key Hair Stylist |
| Naomi Bakstad | Makeup Department Head |
| Megan Harkness | Key Makeup Artist |
| R. Toi Rodchompu | Wigmaker |
Editing | |
| William Kruzykowski | First Assistant Editor |
Production | |
| Iain Belcher | Casting Assistant |
Writing | |
| Stephen Chbosky | Screenplay |
| Jack Thorne | Screenplay |
Production | |
| Jeff Skoll | Executive Producer |
| Robert Kessel | Executive Producer |
| R.J. Palacio | Executive Producer |
| Michael Beugg | Executive Producer |
| Long Qiuyun | Executive Producer |
Costume & Make-Up | |
| Arjen Tuiten | Makeup Designer |
Crew | |
| Leif Havdale | Stunt Coordinator |
| Doug Abrahams | Dialect Coach |
Production | |
| Mylan Stepanovich | Production Manager |
Camera | |
| Michael Burgess | "B" Camera Operator |
| Michael Burgess | Second Unit Director of Photography |
| Daryl Hartwell | "B" Camera Operator |
| Joe Fugallo | Other |
Directing | |
| Soren Miltich | Second Assistant Director |
Production | |
| Alexander Young | Executive Producer |
