Isaiah Mustafa
as Mike Hanlon
Jay Ryan
as Ben Hanscom
James Ransone
as Eddie Kaspbrak
Andy Bean
as Stanley Uris
Bill Skarsgård
as Pennywise
Wyatt Oleff
as Young Stanley
Jack Dylan Grazer
as Young Eddie
Chosen Jacobs
as Young Mike
Jeremy Ray Taylor
as Young Ben
Taylor Frey
as Don Hagarty
Will Beinbrink
as Tom