Jack Black
Jonathan Barnavelt
Cate Blanchett
Florence Zimmerman
Owen Vaccaro
Lewis Barnavelt
Kyle MacLachlan
Isaac Izard
Renée Elise Goldsberry
Selena Izard
Colleen Camp
Mrs. Hanchett
Sunny Suljic
Tarby Corrigan
Lorenza Izzo
Mrs. Barnavelt
Braxton Bjerken
Woody Mingo
Vanessa Anne Williams
Rose Rita Pottinger
Ricky Muse
Bus Driver
Charles Green
Soda Jerk
De'Jon Watts
Clark
Aaron Beelner
Clown Automaton #1
Joshua Phillips
Clown Automaton #2
Christian Calloway
Azazel
Caleb Lawrence
Sweet Shop Employee
Dylan Gage Moore
Sweet Shop Boy
Jalyn Hall
Devin
Jackson T. Giles IV
Student
Eli Roth
Comrade Ivan
Alli Beckman
Magician's Assistant
Emily Brobst
(uncredited)