Casting : Daniel Radcliffe (Harry Potter), Rupert Grint (Ronald 'Ron' Weasley), Emma Watson (Hermione Granger), John Cleese (Sir Nicholas De Mimsy-Porpington (aka Nick Quasi-Sans-Tête)), Robbie Coltrane (Portier Rubeus Hagrid), Richard Griffiths (Oncle Vernon Dursley), Richard Harris (Directeur Albus Dumbledore), Ian Hart (Professeur Quirrel), John Hurt (Mr. Ollivander), Alan Rickman (Professeur Severus Snape), Fiona Shaw (Tante Petunia Evans Dursley), Maggie Smith (Professeur / Directrice adjointe Minerva McGonagall), Sean Biggerstaff (Capitaine Gryffondor Oliver Wood), Warwick Davis (Professeur Flitwick / Goblin Gringotts), Julie Walters (Mrs. Molly Weasley), Zoë Wanamaker (Madame Hooch), David Bradley (Concièrge Argus Filch), Tom Felton (Draco Malfoy), les Triplés Saunders (Bébé Harry Potter), Harry Melling (Dudley Dursley), Derek Deadman (Barman du Leaky Cauldron), Ben Borowiecki (garçon Diagon Alley), Verne Troyer (Griphook), Richard Bremmer (Celui-Dont-On-Ne-Prononce-Pas-Le-Nom / Lord Voldemort), Geraldine Somerville (Lily Evans Potter), Harry Taylor (Gardien de la Station), Bonnie Wright (Ginny Weasley), Chris Rankin (Percy Weasley), James Phelps (Fred Weasley), Oliver Phelps (George Weasley), Jean Southern (Femme à Fossettes dans le train), Matthew Lewis (Neville Longbottom), James Waylett (Vincent Crabbe), Joshua Herdman (Gregory Goyle), Devon Murray (Seamus Finnigan), Alfie Enoch (Dean Thomas), Leslie Phillips (Voix du Chapeau de Tri), Eleanor Columbus (Susan Bones), Terence Bayler (Le Baron Sanglant), Simon Fisher-Becker (le Gros Moine), Nina Young (La Femme Grise), Luke Youngblood (Lee Jordan), Elizabeth Spriggs (la grosse Dame), Danielle Taylor (Angelina Johnson), Leilah Sutherland (Alicia Spinnet), Emily Dale (Katie Bell), David Holmes (Adrian Pucey), Will Theakston (Terrence Higgs), Scott Fern (Marcus Flint), Adrian Rawlins (James Potter), Ray Fearon (Firenze), Kevin Lee (Etudiant de Ravenclaw (non-crédité)), Katharine Nicholson (Pansy Parkinson)...