Ryan Simpkins
Alice
Jordana Spiro
The Widow / Mary Lane
Gillian Jacobs
Adult Ziggy / C. Berman
Kiana Madeira
Sarah Fier / Deena Johnson
Charlene Amoia
Beth Kimball / Rachel Thompson
Ashley Zukerman
Solomon Goode / Nick Goode
Daniel Thomas May
Officer Kuzio
Lloyd Pitts
Nightwing Killer
Michael Chandler
'The Pastor' Cyrus Miller
Mark Ashworth
Jakob Berman
Darrell Britt-Gibson
Martin P. Franklin
Kevin Waterman
'The Milkman' Harry Rooker
Benjamin Flores Jr.
Henry Fier / Josh Johnson
Emily Brobst
Billy Barker
Keil Oakley Zepernick
'Shame Killer' Isaac Milton
Randy Havens
George Fier
Jordyn DiNatale
Ruby Lane
Ted Sutherland
Young Nick Goode
Matthew Zuk
Elijah Goode / Mayor Will Goode
Lynne Ashe
Union Townswoman
Olivia Scott Welch
Hannah Miller / Samantha 'Sam' Fraser
Emily Rudd
Abigail / Cindy Berman
Sadie Sink
Constance / Christine 'Ziggy' Berman
Robert Bryan Davis
Union Townsman 2
Lacy Camp
Grace Miller / Mrs. Fraser
Todd Allen Durkin
The Watchman / Officer Kapinski
Maya Hawke
Heather Watkins (archive footage) (uncredited)
McCabe Slye
Mad Thomas / Tommy Slater
Fred Hechinger
Isaac / Simon Kalivoda
Julia Rehwald
Lizzie / Kate Schmidt
Nilah Blasingame
Highschool Kid
Noah Bain Garret
Skull Mask
Elizabeth Scopel
'Real' Sarah Fier
Patrick Roper
Union Townsman 1