Harry Potter HBO Cast: Every Confirmed Actor and Role

HBO’s Harry Potter arrives this Christmas with the largest ensemble the franchise has ever assembled for a single season, and the official cast list has quietly grown into something worth keeping in one place. This guide covers every confirmed actor and role, as published on the franchise’s official site, and separates the Season 1 company from the names already locked for Season 2.

The eight-episode first season adapts Harry Potter and the Philosopher’s Stone and debuts at Christmas 2026 on HBO and HBO Max. For what the footage itself has shown so far, our September trailer breakdown covers Quirrell, the Mirror of Erised and the troll.

The trio

Dominic McLaughlin as Harry Potter
Arabella Stanton as Hermione Granger
Alastair Stout as Ron Weasley

All three are newcomers, cast from an open search that HBO has said drew tens of thousands of auditions. McLaughlin fronts both teasers released so far, and the marketing has been built around his Harry from the first still onwards.

Hogwarts teachers and staff

The adult casting is where HBO has spent its prestige budget, and the staff table reads like a West End curtain call:

John Lithgow as Albus Dumbledore
Janet McTeer as Minerva McGonagall
Paapa Essiedu as Severus Snape
Nick Frost as Rubeus Hagrid
Luke Thallon as Quirinus Quirrell
Warwick Davis as Filius Flitwick
Sirine Saba as Pomona Sprout
Richard Durden as Cuthbert Binns
Louise Brealey as Rolanda Hooch
Paul Whitehouse as Argus Filch
Bríd Brennan as Poppy Pomfrey

Davis is the one direct link to the film series, having played Flitwick (and Griphook) across the original movies. Thallon’s Quirrell is the closest thing Season 1 has to a confirmed on-screen antagonist: no Voldemort casting has been announced, and HBO’s materials have kept the character entirely out of view.

The Dursleys, the Ministry and Diagon Alley

Bel Powley as Petunia Dursley
Daniel Rigby as Vernon Dursley
Amos Kitson as Dudley Dursley
Bertie Carvel as Cornelius Fudge
Anton Lesser as Garrick Ollivander
Leigh Gill as Griphook
Peter Serafinowicz as Peeves

Peeves is the casting that signals intent. The poltergeist was cut from every film, so Serafinowicz’s role is the clearest early evidence that the series means to adapt material the movies never had room for.

The Weasleys

Katherine Parkinson as Molly Weasley
Tristan Harland and Gabriel Harland as Fred and George
Ruari Spooner as Percy Weasley
Gracie Cochrane as Ginny Weasley (Season 1)

Ginny is the list’s one asterisk: Cochrane plays her in Season 1, with Bonnie Hill taking over for Season 2, when the character moves from the platform to the plot.

The student body

Season 1 fills out all four houses with named, cast roles rather than background players. Gryffindor gets Rory Wilmot as Neville Longbottom, Leo Earley as Seamus Finnigan, Elijah Oshin as Dean Thomas, Alessia Leoni and Sienna Moosah as Parvati Patil and Lavender Brown, plus a full Quidditch roster around Orson Matthews’ Oliver Wood. Slytherin pairs Lox Pratt’s Draco Malfoy with Johnny Flynn as Lucius, alongside Crabbe, Goyle, Pansy Parkinson and an entire named Quidditch team. Hufflepuff and Ravenclaw each get four named first-years, including India Moon as Hannah Abbott and Anjula Murali as Padma Patil.

That depth is the structural tell. The films compressed the student body into a handful of speaking parts; the series is casting classmates years before their stories matter.

Already confirmed for Season 2

Seven castings are explicitly marked for the Chamber of Secrets season:

Kit Harington as Gilderoy Lockhart
Rafe Spall as Arthur Weasley
Bonnie Hill as Ginny Weasley
Billy Barratt as Tom Riddle
Lenny Rush as Dobby
Molly Hewitt-Richards as Moaning Myrtle
Jasper Ambrose as Colin Creevey

Lockhart has the messiest history of the batch: Nicholas Hoult was initially reported in the role before Kit Harington replaced him, and Spall, Hewitt-Richards and Ambrose were announced together in September. Barratt’s Tom Riddle is the quiet headline: Season 2 will put a face on the young Voldemort before any present-day version has been cast.

What is still unannounced

No actor has been named for Voldemort in his restored form, for Sirius Black, Remus Lupin or any role beyond the Chamber of Secrets ensemble. Given the one-book-per-season structure, those announcements have at least a year of runway, and HBO has so far released castings in batches tied to each season’s production rather than teasing ahead.

The complete, continually updated list lives on the franchise’s official site, and this guide reflects it as of mid-October 2026.