Who’s Leading the Pack in the HBO Harry Potter Cast?

It’s hard to believe, but it’s been 13 years since The Deathly Hallows: Part II hit theaters. For a franchise as massive as Harry Potter, that’s a long time to go without a reboot—especially in today’s age of IP-driven entertainment. Sure, the Fantastic Beasts movies kept the wizarding world alive, and Hogwarts Legacy gave millions of fans a chance to live out their magical dreams. But let’s be real—neither truly captures the magic of the original stories.

That’s where HBO’s new Harry Potter TV series comes in. Set to adapt the books in full detail, the series is expected to span a decade or more, providing the most comprehensive take on J.K. Rowling’s saga yet.

The original films launched the careers of Daniel Radcliffe, Emma Watson, and Rupert Grint, while also elevating beloved British actors like Alan Rickman, Michael Gambon, Gary Oldman, Robbie Coltrane, and Imelda Staunton to international prominence. With that legacy in mind, it’s no surprise that this HBO version is shaping up to be one of the most sought-after casting opportunities in British entertainment—second only, perhaps, to Game of Thrones.

Of course, the project isn’t without controversy, especially surrounding J.K. Rowling’s widely debated remarks on trans rights. HBO chief Casey Bloys has confirmed that Rowling is “pretty involved” in the show’s development but insists her presence hasn’t deterred talent from signing on, according to IndieWire.

Still, one of the biggest challenges may be living up to the beloved performances from the films. Can a new cast recapture that magic? We won’t know for some time—the series isn’t expected to premiere until 2027 at the earliest, and casting updates remain scarce. What we do know is that Harry, Ron, and Hermione will once again be played by unknown child actors, just as in the films. As for the adult roles, some exciting names have surfaced.

Let’s put on our Sorting Hat and explore who might be joining the new Potterverse.

Dumbledore

Mark Rylance is rumored to be the frontrunner to play Hogwarts’ wise and enigmatic headmaster. His soft-spoken yet commanding presence makes him an excellent fit—whether playing a cannibal in Bones and All or a sociopathic tech mogul in Don’t Look Up, he has a quiet authority that would work wonderfully.

If Rylance declines, Christopher Eccleston could be an interesting choice. His sterner edge might offer a fresh take on Dumbledore. Alfred Molina, at 71, could channel Michael Gambon’s combination of warmth and depth—but his age might be a concern for such a long-term role.

Meanwhile, Mark Strong has also been mentioned. Though younger and more serious than past Dumbledores, his commanding presence and booming voice could bring an intriguing interpretation.

Severus Snape

According to The Hollywood Reporter, Paapa Essiedu (The Lazarus Project, I May Destroy You) has been offered the role of Hogwarts’ most complex anti-hero. His recent work in Black Doves and Gangs of London shows he can bring the brooding intensity and emotional depth that Snape requires.

If the deal falls through, Michael Fassbender could bring a sharp-edged, intense presence to the role, while Chukwudi Iwuji (Guardians of the Galaxy Vol. 3) has already shown his ability to play charismatic yet terrifying villains.

Hagrid

Replacing Robbie Coltrane is no easy feat, but some actors could rise to the challenge. Mark Addy (Game of Thrones’ Robert Baratheon) has the booming voice and big-hearted energy needed for the role. Meanwhile, Nick Frost (Shaun of the Dead) could bring a more comedic touch to the character.

Brett Goldstein (Ted Lasso) has also been suggested. While his gruff Roy Kent character leans more toward Groundskeeper Willie, with the right adjustments, he could balance warmth and rugged charm to make a great Hagrid.

Voldemort

He Who Must Not Be Named requires an actor who exudes danger and commanding presence. The obvious choice? Cillian Murphy. Fresh off his Oscar-winning performance in Oppenheimer, Murphy’s sharp, angular features and chilling intensity would make him a terrifying Dark Lord.

For a younger Voldemort, Jamie Campbell Bower (Stranger Things’ Vecna) could bring the twisted, eerie energy necessary for the role. He’s already played a dark wizard, Grindelwald, in the Fantastic Beasts films. Does that matter? Probably not.

Professor McGonagall

Following Maggie Smith’s legendary performance is a daunting task, but Eve Best (House of the Dragon) has the sharp wit and regal presence to make an excellent McGonagall.

Other strong contenders include Lesley Manville (The Crown, Phantom Thread), who can channel the maternal yet stern strength the role requires, and Sarah Lancashire (Happy Valley), who has the unshakable presence that commands respect.

Rumors also suggest Sharon Horgan (Bad Sisters) and Rachel Weisz may be in the mix. Both are unexpected choices but have the acting chops to surprise us.

Sirius Black

Sirius is wild, rebellious, and just a little bit disheveled—but also endearing. Kit Harington (Game of Thrones) would bring the right balance of brooding depth and charm, while Richard Madden (Bodyguard) might offer a more introspective take on Sirius.

Other possibilities include Benedict Cumberbatch (a bit older) and Tom Hiddleston, who could bring some of Loki’s unpredictability to the role. A more left-field suggestion? The White Lotus’ Will Sharpe, who has the look and vibe for it.

Bellatrix Lestrange

Helena Bonham Carter set the gold standard, but if anyone can match her unhinged energy, it’s Mia Goth. Her chilling performance in Pearl proves she can play a character who is equal parts deranged and mesmerizing.

If the studio wants a slightly different take, Jodie Comer (Killing Eve) brings sinister allure, and Anya Taylor-Joy has the depth and unpredictability needed to make Bellatrix unforgettable.

With a decade-long production timeline, this Harry Potter series has the potential to redefine the franchise for a new generation. While casting speculation is exciting, the true magic will come from how these actors make these iconic roles their own.

Will HBO’s Harry Potter live up to the legacy of the films? We’ll have to wait until 2027 to find out. But until then, the casting possibilities are endless—and we can’t wait to see who gets the call.