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