- 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
- Andy Muschietti
- Director
- Gary Dauberman
- Executive Producer, Screenwriter
- Richard Brener
- Executive Producer
- Dave Neustadter
- Executive Producer
- Marty P. Ewing
- Executive Producer
- Seth Grahame-Smith
- Executive Producer
- David Katzenberg
- Executive Producer
- Dan Lin
- Producer
- Roy Lee
- Producer
- Barbara Muschietti
- Producer
- Checco Varese
- Cinematographer
- Jason Ballantine
- Film Editing
- Benjamin Wallfisch
- Original Music
- Paul Denham Austerberry
- Production Design
- Luis Sequeira
- Costume Design
- Rich Delia
- Casting
