Jamie Parker (Harry Potter), Paul Thornley (Ron Weasley), Noma Dumezweni (Hermione Granger), Poppy Miller (Ginny Potter), Alex Price (Draco Malfoy), Sam Clemmett (Albus Potter), Anthony Boyle (Scorpius Malfoy), Susan Heyward (Rose Granger-Weasley/Young Hermione), Jessie Fisher (Delphi Diggory), Joshua De Jesus (Craig Bowker Jr.), Lauren Nicole Cipoletti (Moaning Myrtle/Lily Potter Sr.), Madeline Weinstein (Polly Chapman), Byron Jennings (Uncle Dursley/Severus Snape/Lord Voldemort), Brian Abraham (Hagrid/Sorting Hat), Jess Barbagallo (Yann Fredericks), Kathryn Meisle (Aunt Petunia/Trolley Witch/Dolores Umbridge), Edward James Hyland (Amos Diggory/Albus Dumbledore), Geraldine Hughes (Minerva McGonagall), Benjamin Wheelwright (Cedric Diggory/James Potter Jr./James Potter Sr.), Joey Labrasca (Dudley Dursley/Karl Jenkins/Viktor Krum), David St Louis (Bane), Will Coombs (Young Harry Potter), Olivia Bond (Lily Potter Jr.), David Abeles (Station Master)