Ansel Elgort as Theodore Decker

Oakes Fegley as Young Theodore Decker

Nicole Kidman as Samantha Barbour

Jeffrey Wright as James 'Hobie' Hobart

Luke Wilson as Larry Decker

Sarah Paulson as Xandra

Willa Fitzgerald as Kitsey Barbour

Aneurin Barnard as Boris Pavlikovsky

Finn Wolfhard as Young Boris Pavlikovsky

Ashleigh Cummings as Pippa

Aimee Laurence as Young Pippa

Robert Joy as Welton 'Welty' Blackwell

Boyd Gaines as Mr. Barbour

Carly Connors as Young Kitsey Barbour

Luke Kleintank as Platt Barbour

Hailey Wist as Theo's Mother

Ryan Foust as Andrew 'Andy' Barbour

Jack DiFalco as Young Platt Barbour

Austin Weyant as Adult Toddy Barbour

Collin Shea Schirrmacher as Young Toddy Barbour

Nicky Torchia as Young Tom Cable

Denis O'Hare as Lucius Reeve

Peter Jacobson as Mr. Silver

Joey Slotnick as Dave

Gordon Winarick as Adult Tom Cable

Caroline Day as Em

Pamela Dunlap as Mrs. Vogel

Misha Osherovich as Shirley T

Aidan Kennedy as Middle School Student

Alton Fitzgerald White as Social Worker

Kevin D. McGee as Doorman

Hannah Kurczeski as Middle School Student

Matteo van der Grijn as Gyuri

Kevin Owen McDonald as Mr. Pavlikovsky

Nick Vorsselman as Boy on Street at Airport

Hank Rogerson as Vegas Teacher

Robert Turano as Detective #2

Don Castro as Detective #1

Rick Bolander as Paramedic

Vincent Tumeo as Bar Patron - Restaurant

Ben Hollandsworth as Race

Gerson Oratmangoen as Indonesian Man

Angela Covello as Female Social Worker

Dylan Boyd as Student

James Donahower as Mr. Beeman

Alma Cuervo as Store Owner