Jaeden Martell as Bill Denbrough

Jeremy Ray Taylor as Ben Hanscom

Sophia Lillis as Beverly Marsh

Finn Wolfhard as Richie Tozier

Chosen Jacobs as Mike Hanlon

Jack Dylan Grazer as Eddie Kaspbrak

Wyatt Oleff as Stanley Uris

Bill Skarsgård as Pennywise

Nicholas Hamilton as Henry Bowers

Jake Sim as Belch Huggins

Logan Thompson as Victor Criss

Owen Teague as Patrick Hockstetter

Jackson Robert Scott as Georgie Denbrough

Stephen Bogaert as Mr. Marsh

Stuart Hughes as Officer Bowers

Geoffrey Pounsett as Zach Denbrough

Pip Dwyer as Sharon Denbrough

Molly Atkinson as Sonia Kaspbrak

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

Katie Lunman as Betty Ripsom

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

David Katzenberg as El Aparato (uncredited)

Bobby Leigh as Jonathan (uncredited)

Kate Moyer as Esther (uncredited)

Jimmy Star as Man in Car (uncredited)

Kelly Van der Burg as Abigail (uncredited)