Jessica Chastain

Beverly Marsh

James McAvoy

Bill Denbrough

Bill Hader

Richie Tozier

Isaiah Mustafa

Mike Hanlon

Jay Ryan

Ben Hanscom

James Ransone

Eddie Kaspbrak

Andy Bean

Stanley Uris

Bill Skarsgård

Pennywise

Jaeden Martell

Young Bill Denbrough

Wyatt Oleff

Young Stanley Uris

Jack Dylan Grazer

Young Eddie Kaspbrak

Finn Wolfhard

Young Richie Tozier

Sophia Lillis

Young Beverly Marsh

Chosen Jacobs

Young Mike Hanlon

Jeremy Ray Taylor

Young Ben Hanscom

Teach Grant

Henry Bowers

Nicholas Hamilton

Young Henry Bowers

Javier Botet

Hobo / The Witch

Xavier Dolan

Adrian Mellon

Taylor Frey

Don Hagarty

Molly Atkinson

Myra / Sonia Kaspbrak

Joan Gregson

Mrs. Kersh

Stephen Bogaert

Alvin Marsh

Luke Roessler

Dean

Stephen King

Shopkeeper

Peter Bogdanovich

Peter - Director

Will Beinbrink

Tom

Jess Weixler

Audra Phillips

Martha Girvin

Patty

Ryan Kiera Armstrong

Victoria Fuller

Jackson Robert Scott

Dead Georgie

Jake Weary

Webby

Katie Lunman

Chris Unwin

Kelly Van der Burg

Victoria's Mom

Jason Fuchs

Richie's Manager

Joe Bostick

Mr. Keene

Megan Charpentier

Young Gretta

Juno Rinaldi

Gretta

Neil Crone

Chief Borton

Ry Prior

Connor

Owen Teague

Dead Hockstetter

Jake Sim

Belch Huggins

Connor Smith

Carny

Amanda Zhou

Waitress

Rob Ramsay

Meaner Nurse

Doug MacLeod

Head Honcho

Brandon Crane

Big Guy

Erik Junnola

Scuzzah

Kiley May

Shokopiwah Woman

Stephen R. Hart

Shokopiwah Man

Billy Merasty

Shokopiwah Man

Ari Cohen

Stanley's Dad

Edie Inksetter

Shouting Kid's Mom

Sonia Maria Chirila

Fishtank Girl

Declan Prior

Bully

Kate Corbett

Dean's Mom

Janet Porter

Richie's Mom

Anthony Ulc

The Butcher

J. Bogdan

Swearing Patient

Louise Stratten

Audra's Assistant

Liam MacDonald

Dean's Friend

Andy Muschietti

Pharmacy Customer (uncredited)