How to Get Cast on HBO’s New ‘Harry Potter’ Series

“Harry Potter” begins when the 11-year-old title character, an orphan living with his unkind aunt and uncle, learns he’s a wizard and accepts an invitation to attend the Hogwarts School of Witchcraft and Wizardry. Harry soon discovers he’s famous throughout the magical community because of his connection to the dark wizard Lord Voldemort. Years earlier, Voldemort had tried to rule the wizarding world, killing anyone who stood in his way, including Harry’s parents. However, when Voldemort attempted to kill one-year-old Harry, his curse rebounded, leaving the young boy with a lightning bolt scar and “He Who Must Not Be Named” gone—or so the wizarding world thought. 

Enrolled at Hogwarts, Harry befriends the genial Ron Weasley and the bookish Hermione Granger. The trio become fast friends as they embark on a years-long adventure to vanquish Voldemort and his followers for good. (They even squeeze in a game or two of Quidditch!)

On June 26, 2024, HBO announced the writer and director for the new “Harry Potter” series. Francesca Gardiner (“Succession,” “His Dark Materials,” “Killing Eve”) is the upcoming series’ showrunner and executive producer, with Mark Mylod (“Game of Thrones,” “Succession,” “The Last of Us”) signed on to executive produce and direct multiple episodes. 

HBO’s “Harry Potter” series will also be executive produced by Rowling, Neil Blair (“The Casual Vacancy,” the “Fantastic Beasts” films), and Ruth Kenley-Letts (“The Casual Vacancy,” “C.B. Strike”). David Heyman, who executive produced the “Harry Potter” and “Fantastic Beasts” films, is also expected to join. The decision to have Rowling involved is under scrutiny, due to her ongoing transphobic comments that continue to have a dire impact on the trans community. However, Casey Bloys, chairman and CEO of HBO & Max Content, made this statement about the decision:

“We are in the ‘Harry Potter’ business. The TV show is new and exciting, but we’ve been in the ‘Harry Potter’ business for 20 years; this isn’t a new decision. We’re comfortable being in the ‘Potter’ business. J.K. is a very online conversation…. It’s very nuanced and complicated and not something we’re going to get into. Our priority is what’s onscreen. The ‘Harry Potter’ story is incredibly affirmative and positive about love and acceptance, and that’s our priority, what’s on the screen.”

Credit: Aidan Monaghan/HBO

On May 27, 2024, HBO revealed its new main trio: Dominic McLaughlin will play Harry Potter, Arabella Stanton will play Hermione Granger, and Alastair Stout will play Ron Weasley. 

“After an extraordinary search led by casting directors Lucy Bevan and Emily Brockmann, we are delighted to announce we have found our Harry, Hermione, and Ron,” said Gardiner and Mylod. “The talent of these three unique actors is wonderful to behold, and we cannot wait for the world to witness their magic together onscreen. We would like to thank all the tens of thousands of children who auditioned. It’s been a real pleasure to discover the plethora of young talent out there.” 

“Harry Potter” is just the second screen credit for McLaughlin, after John McPhail’s family comedy film “Grow.” Stanton starred in the title role of “Matilda the Musical” on the West End from 2023 to 2024, while Stout is making his major acting debut in the series. 

As for who else will be joining the magic, casting rumors first began swirling in early 2025—just as the Daily Prophet’s Rita Skeeter would like it—about who will be playing the franchise’s beloved professors. 

Academy Award–nominated actor John Lithgow (“Conclave,” “The Crown”) confirmed rumors in March, announcing he had signed on to play the one and only Professor Albus Dumbledore. “It was not an easy decision because it’s going to define me for the last chapter of my life, I’m afraid,” Lithgow told ScreenRant. “But I’m very excited. Some wonderful people are turning their attention back to Harry Potter. That’s why it’s been such a hard decision. I’ll be about 87 years old at the wrap party, but I’ve said yes.”  

Following the news of Lithgow, Deadline confirmed Janet McTeer (“Ozark,” “The Menu”), Tony winner and two-time Oscar nominee, landed the role of Professor Minerva McGonagall, and Paapa Essiedu (“I May Destroy You,” “Genie”) will play Professor Severus Snape. These two characters were played by the late (and legendary) Maggie Smith and Alan Rickman, respectively, in the original films. 

Deadline also confirmed that British actor-comedian Nick Frost will play the beloved half-giant Rubeus Hagrid. Hagrid was previously portrayed by the late Robbie Coltrane. 

Other series regulars include Luke Thallon as Professor Quirinus Quirrell and Paul Whitehouse as Argus Filch. Whitehouse had a small role in the “Harry Potter and the Prisoner of Azkaban” movie, although he’s no longer the only cast member who’s appeared in any of the franchise’s previous films, as Warwick Davis will reprise his role as Professor Filius Flitwick for the series.

In June, even more cast members were announced—including the role of Harry’s Slytherin rival, Draco Malfoy (previously played by Tom Felton). Lox Pratt will be portraying the icy “pure blood” wizard in the new series. 

According to the Hollywood Reporter, along with the Lott’s casting news, other key players were announced as well, such as Katherine Parkinson as Molly Weasley, Johnny Flynn as Lucius Malfoy, Leo Earley as Seamus Finnigan, Alessia Leoni as Parvati Patil, Sienna Moosah as Lavender Brown, Bel Powley as Petunia Dursley, Daniel Rigby as Vernon Dursley, and Bertie Carvel as Cornelius Fudge.

Other additions to the ever-growing HBO cast include Rory Wilmot as Neville Longbottom, Amos Kitson as Dudley Dursley, Louise Brealey as Madam Rolanda Hooch, Anton Lesser as Garrick Ollivander, Gracie Cochrane as Ginny Weasley, Tristan and Gabriel Harland as Fred and George Weasley, Ruari Spooner as Percy Weasley, and Richard Durden as Professor Cuthbert Binns.

As for who will play the franchise’s villain, Lord Voldemort, at one point, “Oppenheimer” star Cillian Murphy’s name was circling for the role. Ralph Fiennes, who played You-Know-Who in the films, weighed in on the gossip in an interview on Bravo’s “Watch What Happens Live.” “Cillian is a fantastic actor,” said Fiennes. “That’s a wonderful suggestion. I would be all in favor of Cillian.” However, in recent days, rumors indicate major changes for the character ahead, as Cynthia Erivo is reportedly being considered for this critical “Harry Potter” role.

At this time, the rest of the cast for the new series still remains a chamber of secrets.

Lucy Bevan, alongside her colleague Emily Brockmann, are the primary CDs for HBO’s new “Harry Potter” series. Bevan is known for casting hits like “Barbie,” “The Batman,” and “Belfast.”

As for how to get Bevan’s attention in the audition room, she shared in an interview with the SAG-AFTRA Foundation that she notices “when an actor comes in and they’ve really prepped.” 

“They’ve really thought about it, they’ve got an idea, they’ve got a way of doing it, they’re ready to take direction and make adjustments—I think that’s the really key thing,” she said. “Don’t get locked into some idea. Be ready to take direction. But I think the best way to do that is to be prepped.”

While the new “Harry Potter” series has recruited a number of big names to fill out its roster, casting the main three saw the team issue an open casting call for U.K. and Ireland residents in 2024. Much like those who made the original films such a hit, the team wanted to tap relative unknowns. So, there’s much to learn from what went into casting Daniel Radcliffe, Rupert Grint, and Emma Watson as Harry Potter, Ron Weasley, and Hermione Granger, respectively, in the film franchise, as each lead had a completely different audition experience.

Director Chris Columbus told Closer Weekly that casting “the boy who lived” was not an easy task. “We had auditioned hundreds of actors for the role of Harry, but with little luck. Then, the first casting director, in a fit of total frustration, threw up her arms and said, ‘I just don’t know what you want!’ Sitting on a shelf in the office was a video copy of [TV mini series] ‘David Copperfield,’ starring Daniel Radcliffe. I picked up the video box, pointed to Dan’s face, and said, ‘This is who I want! This is Harry Potter,’ ” he said.

“We knew from the start that Dan was Harry Potter. He had the magic, the inner depth and darkness that is very rare in an 11-year-old. He also has a sense of wisdom and intelligence that I haven’t seen in many other kids his age,” Columbus added. “We knew we made the right choice after sending [Rowling] a copy of his screen test. Her comment was to the effect, ‘I feel as if I’ve been reunited with my long-lost son.’ ”  

As for Harry’s lovable sidekick, Grint said he first auditioned for Ron by sending in a self-tape. “I decided to do my own audition video, pretending to be one of my drama teachers. I dressed up like my teacher, who’s a girl, so it was kind of scary. Then I made up this rap song about how much I wanted to be in the film,” he recalled. “I guess it worked, because I had a bunch of auditions. It was so cool when I was cast. It was the coolest moment in my life. I’d just been doing school plays and stuff. One time, I was a fish in ‘Noah’s Ark,’ and then I was in ‘Harry Potter’—that’s a big step!”

Meanwhile, Watson landed an audition when the casting team visited her school. She told Interview, “There was no open audition—they went all over England to find these characters, and not just drama schools. They came to my school and asked if they could put forward a group of 20 children between the ages of 9 and 12. They took my photograph in the school gym, and then I got a call three weeks later.”

Watson ultimately endured a rather grueling process, auditioning approximately eight times before getting cast. She was convinced she was going to lose the part to someone more experienced. “I won’t say the name, but there was this girl who had already done a film before,” she said. “I can remember just crumbling at the sight of her, thinking, She’s been in a film before, and she knows how to do this. I have no chance.” 

Yet somehow, Watson knew she was perfect for the role from the very start. “I loved the books—I was a massive fan. I just felt like that part belonged to me. I know that sounds crazy, but from that first audition, I always knew. At the beginning, they were casting the other characters as well—but I always knew I was going out for Hermione. She came so naturally to me. Maybe so much of myself at the time was similar to her,” she explained. “Of course, all this terrified my parents—there were literally thousands and thousands of girls going out for the audition, and my parents were anxious about what I would do if I didn’t get it.”

Production for HBO’s “Harry Potter” series began on July 14, 2025, at Warner Bros. Studios Leavesden in the U.K., according to a press release. The series is set to debut Christmas 2026 on HBO and HBO Max. 

In October 2024, HBO held open casting calls for Harry, Hermione, and Ron. Production sought talent local to the U.K. and Ireland, aged 9–11 as of April 2025, to play the show’s three leads in the upcoming “Harry Potter” series. Those who met the requirements were encouraged to submit two self-tapes by Oct. 31. The first video was to be a reading of a short poem or story of the applicant’s choosing (they advised to avoid anything related to “Harry Potter”). The second was to be a quick personal introduction, including the applicant’s date of birth, height, and location. The notice also said that the production is “committed to inclusive, diverse casting.”

For more casting calls, actors can check out these “Harry Potter”–inspired gigs. Our guide to auditioning for HBO Max is also a great resource for those looking for more advice.

Credit: Lara Cornell/HBO

Although HBO’s “Harry Potter” series seemingly still has more roles to cast, those who originated the iconic characters have plenty of audition advice. 

For Grint, the “Harry Potter” set was his first real foray into professional acting. “In terms of training, [I had] nothing….” Grint told us. “But really, when I started ‘Potter,’ being on set and being surrounded by so many amazing actors was an education for all of us, really—just watching how everyone works. And we were so lucky that we had a huge range of different actors and different directors. Through osmosis, when you’re young, you really soak up that stuff. When we finished, it did kind of feel like we were graduating.”

However, to this day, Grint finds self-tapes rather difficult—but he’s found a way to succeed on that front, too. “I struggle with self-tape. I think I’m better in a room with people. Just talking to a screen, especially if you don’t have anyone to do the lines with you, you’re kind of doing a scene with yourself. It’s difficult—I think the more you do, the easier it becomes; you kind of find your groove,” he explained. “If you commit to the character, if you put everything into that and don’t do it half-hearted, it’ll come through. But it’s definitely a challenge, and it’s something I still struggle with, for sure.”

Oscar winner Gary Oldman, who played Sirius Black in the films, has decades of experience in the business, yet when it comes to audition advice, he still remembers one tidbit from his younger days.

“I was very nervous and worried about an audition…. And a young director that I had done a little bit of work with said to me, ‘When you go in to do this audition, you’re probably going to be one of the best actors they’ve seen all week, because you have this thing in your head that you’re less than.’ I still have it,” Oldman told us. “I think it’s the natural thing of the performer, or someone who is creative: egomaniac with low self-esteem. You’ve got to have something that pushes you forward to just get up there in front of people, and yet there’s a vulnerability and insecurity that comes with it.” 

He added, “I think that’s what keeps driving you to get better and better and better. But I remember it really helped; it did take the edge off the nerves. And take your time. Breathe and take your time. If they’re horrid to you, then maybe they weren’t worth working for anyway—that’s what matters. That’s why I always think it doesn’t cost very much to be polite and to be nice.”

When the late Alan Rickman, who played Severus Snape, was asked to write a letter of advice to his 16-year-old self for the book “Dear Me,” the acclaimed actor noted that the best idea was not to follow any advice at all. “If, in future years, anyone asks you to give advice to your 16-year-old self…don’t,” he wrote. “Make your own unique messes, and then work your own way out of them.” Considering this new series will likely launch the careers of multiple newcomers, much like the films did for its three leads, Rickman’s “advice” might be the best to remember.