Oakes Fegley
Ben

Millicent Simmonds
Rose

Julianne Moore
Lillian Mayhew / Rose

Michelle Williams
Elaine

Cory Michael Smith
Walter

James Urbaniak
Dr. Kincaid, Rose's Father

Damian Young
Otto, Museum Guard

Patrick Murney
Workman

Lauren Ridloff
Pearl, The Maid

Anthony Natale
Dr. Gill, Teacher of the Deaf

Brian Berrebbi
Stage Manager

John P. McGinty
Valentin

Garrett Zuercher
Officer Engel

Jared Johnston
Officer Murtha

Murphy Guyer
Security Chief

Ekaterina Samsonov
Hannah

Sawyer Niehaus
Blessing

Jaden Michael
Jamie

Tom Noonan
Walter

Morgan Turner
Janet

Amy Hargreaves
Aunt Jenny

Sawyer Nunes
Robbie

Raul Torres
Jamie's Father

Mandela Bellamy
Woman on Bus

Jim Lavin
ER Doctor

Hays Wellford
Greg Coons at the Bus Stop

John Boyd
Danny

Derek Chadwick
Liam (uncredited)

Logan Taylor
Promenade Child / Museum Child (uncredited)