Isabel

Julia Roberts

Auggie Pullman

Jacob Tremblay

Nate Pullman

Owen Wilson

Mr. Tushman

Mandy Patinkin

Via

Izabela Vidovic

Summer

Millie Davis

Jack Will

Noah Jupe

Justin

Nadji Jeter

Mr. Browne

Daveed Diggs

Julian

Bryce Gheisar

Miranda

Danielle Rose Russell

Ms. Petosa

Ali Liebert

Michelle

Emma Tremblay

Teenage Doctor

Mark Dozlaw

Nurse

Rukiya Bernard

Neonatologist

Jennifer March

Charlotte

Elle McKinnon

Amos

Ty Nicolas Consiglio

Grans

Sônia Braga

Miles

Kyle Harrison Breitkopf

Henry

James Hughes

Henry

James A Hughes

Darth Sidious

J. Douglas Stewart

Dodgeball Player

Joseph Gordon

Cute Guy

Cameron Roberts

Ella

Erika McKitrick

Mr. Davenport

Ben Ratner

School Photographer

Jason McKinnon

Reid

Izzy Lieberman

Rebecca

Hannah Hoberman

Chewbacca

Michael Alan Healy

Jack Will's Mom

Nicole Oliver

Ximena Chin

Emily- Rose Delahunty

Ximena Chin

Emily Delahunty

Savanna

Lucia Thain

Maya

Sasha Neuhaus

Miranda's Mom

Rachel Hayward

Guy on Bus

Callahan Brebner

Our Town Player

Caleb Gordon

Our Town Player

Grayson Maxwell Gurnsey

Our Town Player

Emily Giannozio

Our Town Player

Haley Goldin

Via (Age 4)

Macie Margaret Chbosky

Via (Age 4)

Maccie Margaret Chbosky

Science Fair Judge

Victoria Cruz

Science Fair Judge

Victoria V. Cruz

Julian's Mom

Crystal Lowe

Julian's Dad

Steve Bacic

Camp Counsellor

Jason Tremblay

Danny

Armen Henry Bagdasarov

Eddie

William Dickinson

Lina Annan

Lidya Jewett

Angela

Kaelyn Breitkopf

Danny

Armen Bagdasarov

Classmate (uncredited)

Brayden Snow

School Kid (uncredited)

Andre Robinson

Classmate Parent (uncredited)

Amber Snow

Parent (uncredited)

Ann Evans

Daughter at Coney Island Beach (uncredited)

Abigail Friend