Jacob Tremblay
Role: Auggie
Julia Roberts
Role: Isabel
Bryce Gheisar
Role: Julian
Mandy Patinkin
Role: Mr. Tushman
Danielle Rose Russell
Role: Miranda
Daveed Diggs
Role: Mr. Browne
Mark Dozlaw
Role: Teenage Doctor
Rukiya Bernard
Role: Nurse
Jennifer March
Role: Neonatologist
Elle McKinnon
Role: Charlotte
Kyle Breitkopf
Role: Miles
James A Hughes
Role: Henry
J. Douglas Stewart
Role: Darth Sidious
Ali Liebert
Role: Ms. Petosa
Joseph Gordon
Role: Dodgeball Player
Cameron Roberts
Role: Cute Guy
Erika McKitrick
Role: Ella
Ben Immanuel
Role: Mr. Davenport
Jason McKinnon
Role: School Photographer
Hannah Hoberman
Role: Rebecca
Michael Alan Healy
Role: Chewbacca
Nicole Oliver
Role: Jack Will's Mom
Emily Delahunty
Role: Ximena Chin
Rachel Hayward
Role: Miranda's Mom
Callahan Brebner
Role: Guy on Bus
Caleb Gordon
Role: Our Town Player
Grayson Maxwell Gurnsey
Role: Our Town Player
Emily Giannozio
Role: Our Town Player
Haley Goldin
Role: Our Town Player
Maccie Margaret Chbosky
Role: Via (Age 4)
Victoria V. Cruz
Role: Science Fair Judge
Yan-Kay Crystal Lowe
Role: Julian's Mom
Steve Bacic
Role: Julian's Dad
Jason Tremblay
Role: Camp Counsellor
William Dickinson
Role: Eddie
Emma Tremblay
Role: Michelle
Armen Bagdasarov
Role: Danny
Lidya Jewett
Role: Lina Annan
Kaelyn Breitkopf
Role: Angela
Brayden Snow
Role: Classmate (uncredited)
Andre Robinson
Role: School Kid (uncredited)
Alyssa Andronyk
Role: School Kid (uncredited)
Wilson Chieng
Role: Simon Stimson (uncredited)
Dallas Snow
Role: Classmate (uncredited)
Justin Snow
Role: Classmate (uncredited)
Kayzhia Snow
Role: Classmate (uncredited)
Amber Snow
Role: Classmate Parent (uncredited)
Elayna Sing
Role: Classmate (uncredited)
Ann Evans
Role: Parent (uncredited)
Abigail Friend
Role: Daughter at Coney Island Beach (uncredited)
Razvan Orban
Role: Boy in Red (uncredited)
Kari Staten
Role: Parent (uncredited)
