- Millie Bobby Brown- Eleven
- Gaten Matarazzo- Dustin
- Finn Wolfhand- Mike
- Caleb McLaughlin- Lucas
- Winona Ryder- Joyce
- Noah Schnapp- Will
- David Harbour- Chief Hopper
- Natalia Dyer- Nancy
- Charlier Heaton- Jonathan
- Joe Keery- Steve Harrington
- Dacre Montgomery- Billy
- Sadie Sink- Max