Jaeden Martell
as Bill Denbrough

Sophia Lillis
as Beverly Marsh

Jack Dylan Grazer
as Eddie Kaspbrak

Finn Wolfhard
as Richie Tozier

Jeremy Ray Taylor
as Ben Hanscom

Wyatt Oleff
as Stanley Uris

Chosen Jacobs
as Mike Hanlon

Bill Skarsgård
as Pennywise

Jackson Robert Scott
as Georgie Denbrough

Nicholas Hamilton
as Henry Bowers

Stephen Bogaert
as Mr. Marsh

Stuart Hughes
as Officer Bowers

Owen Teague
as Patrick Hockstetter

Molly Atkinson
as Sonia Kasprak

Jake Sim
as Belch Huggins

Logan Thompson
as Victor Criss

Katie Lunman
as Betty Ripsom

Geoffrey Pounsett
as Zach Denbrough

Pip Dwyer
as Sharon Denbrough

Steven Williams
as Leroy Hanlon

Elizabeth Saunders
as Mrs. Starret

Megan Charpentier
as Gretta

Joe Bostick
as Mr. Keene

Ari Cohen
as Rabbi Uris

Anthony Ulc
as Joe the Butcher

Javier Botet
as Hobo

Carter Musselman
as Headless Boy

Tatum Lee
as Judith

Edie Inksetter
as Hostess

Martha Gibson
as Old Woman

Kasie Rayner
as Field Hockey Girl #1

Isabelle Nélisse
as Girl in Bathroom

Jocelyn Mattka
as Another Girl

Donald Tripe
as Old Man in Car

Liz Gordon
as Old Woman in Car

Paige Rosamond
as Dead Girl #1

Neil Crone
as Chief Borton

Sonia Gascón
as Mrs. Ripsom

Janet Porter
as Stanley's Mother

Memo Díaz Capt.
as 4th of July Clown

Chantal Vachon
as Girl in Magazine

Roberto Campanella
as Organ Player Clown

Cyndy Day
as Pharmacy Cashier (uncredited)

David Katzenberg
as El Aparato (uncredited)

Bobby Leigh
as Jonathan (uncredited)

Kate Moyer
as Esther (uncredited)

Sherry Nelson
as Woman on Street (uncredited)

Jimmy Star
as Man in Car (uncredited)

Kelly Van der Burg
as Abigail (uncredited)

James Magwood
as Student (uncredited)