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), Cherrelle Skeete (Rose Granger-Weasley/Young Hermione), Esther Smith (Delphi Diggory), Annabel Baldwin (Moaning Myrtle/Lily Potter Sr.), Claudia Grant (Polly Chapman), Barry McCarthy (Amos Diggory/Albus Dumbledore), Sandy McDade (Minerva McGonagall), Jack North (Dudley Dursley/Karl Jenkins/Viktor Krum), Nuno Silva (Bane), Helena Lymbery (Madam Hooch)