James McAvoy
Bill Denbrough
Jessica Chastain
Beverly Marsh
Isaiah Mustafa
Mike Hanlon
James Ransone
Eddie Kaspbrak
Jaeden Martell
Young Bill Denbrough
Sophia Lillis
Young Beverly Marsh
Finn Wolfhard
Young Richie Tozier
Chosen Jacobs
Young Mike Hanlon
Wyatt Oleff
Young Stanley Uris
Jeremy Ray Taylor
Young Ben Hanscom
Jack Dylan Grazer
Young Eddie Kaspbrak
Nicholas Hamilton
Young Henry Bowers
Javier Botet
Hobo / The Witch
Xavier Dolan
Adrian Mellon
Molly Atkinson
Myra / Sonia Kaspbrak
Stephen Bogaert
Alvin Marsh
Jess Weixler
Audra Phillips
Ryan Kiera Armstrong
Victoria Fuller
Jackson Robert Scott
Dead Georgie
Kelly Van der Burg
Victoria's Mom
Jason Fuchs
Richie's Manager
Megan Charpentier
Young Gretta
Owen Teague
Dead Hockstetter
Logan Thompson
Victor Criss
John Connon
John Koontz (Juniper Hill Security)
Peter George Commanda
Shokopiwah Shaman
Kiley May
Shokopiwah Woman
Lisa Cromarty
Shokopiwah Woman
Kevin Allan Hess
Shokopiwah Man
Stephen R. Hart
Shokopiwah Man
Rocky L. Burnham Jr.
Shokopiwah Man
Billy Merasty
Shokopiwah Man
Sladen Peltier
Shokopiwah Young Boy
Edie Inksetter
Shouting Kid's Mom
Sonia Maria Chirila
Fishtank Girl
J. Bogdan
Swearing Patient
Louise Stratten
Audra's Assistant
Laura Thorne
Production Assistant
Thomas Duhig
Assistant Director
Carla Guerrier
Police Officer
Liam MacDonald
Dean's Friend
Chris D'Silva
Dean's Friend
Tristan Levi Cox
4-Year-Old Young Mike
Torian Matthew Cox
4-Year-Old Young Mike
Lola Del Re Hudson
Betty Ripsom's Legs
Thiago Dos Santos
Twitchy Man
Divan Meyer
Audience Member (uncredited)
Andy Muschietti
Pharmacy Customer (uncredited)