Harry Potter TV Series: See Nick Frost's Transformation into Hagrid

In July 2025, it was announced that Game of Thrones actor Anton Lesser would be opening the doors to Ollivanders, taking over the role of wandmaker Garrick Ollivander from the late, great John Hurt.

Young actor Rory Wilmot is set to star as fan favorite Gryffindor student Neville Longbottom, who was previously played by Matthew Lewis.

British actress Louise Brealey will take over from Zoe Wanamaker as Madam Rolanda Hooch, the Quidditch flying instructor. Brealey is perhaps best known for her roles in Sherlock, A Discovery of Witches and Hulu's Such Brave Girls.

Harry's cousin Dudley will be played by newcomer Amos Kitson. Harry Melling portrayed the young Dursley in the original movies.

The iconic Slytherin will be played by rising star Lox Pratt. He takes over from Tom Felton, who recently announced he will be heading to Broadway to take on the adult version of Draco in Harry Potter and The Cursed Child.

In June 2025, HBO announced that Ripley actor Johnny Flynn would be taking on the role of Draco's father, Lucius Malfoy. The White Lotus star Jason Isaacs portrayed Lucius in the movie series and he took to Instagram to congratulate his successor: "Thrilled to be passing the keys to Malfoy Manor to @johnnyflynnmusic, a monstrously talented renaissance man."

Katherine Parkinson, who won a BAFTA award for her performance in British sitcom The IT Crowd, will star in the TV adaptation as the Weasley matriarch. The role was previously played by Mamma Mia! actress Julie Walters.

In March 2025, Variety reported that comedian Nick Frost was nearing a deal to play half-giant Hagrid. Frost was launched to fame for his roles alongside Simon Pegg in Shaun of the Dead and Hot Fuzz. Hagrid was played in the original films by Robbie Coltrane, who died in 2022.

In December 2024, it was reported that Emmy-nominated British actor Paapa Essiedu was in talks to play Professor Snape, who was memorably portrayed by the late Alan Rickman in the movies. Essiedu is a rising star of stage and screen, perhaps most recognized for his role in the HBO drama I May Destroy You.

BAFTA-winner Daniel Rigby will step into the shoes of Harry's uncle in the HBO Max series. "Thrilled to be playing the world’s worst muggle, Uncle Vernon," Rigby posted on Instagram. The role was previously played by Richard Griffiths, who died in 2013.

British actress Bel Powley will follow in Fiona Shaw's footsteps and take on the role of Aunt Petunia. Powley's screen credits include The Morning Show, A Small Light and Masters of the Air.

British actress Janet McTeer is set to play Professor McGonagall, head of Gryffindor and Hogwarts' Deputy Headmistress. McTeer's career spans back decades and includes roles in Ozark, Jessica Jones, and Sorry for Your Loss. The legendary Dame Maggie Smith took on the role in the film franchise.

In April 2025, HBO announced that five-time BAFTA winner Paul Whitehouse would be stepping into the boots of Hogwarts caretaker Filch, taking over the role played by David Bradley in the films. Whitehouse is well known for his comedy work in the UK, and (fun fact!) he also appeared as Sir Cadogan, one of the living portraits in Harry Potter and the Prisoner of Azkaban.

A trio of youngsters will take on the supporting roles of Harry's schoolmates Seamus Finnigan, Parvati Patil and Lavender Brown. Those characters were previously played by Devon Murray, Shefali Chowdhury and Jessie Cave.

In June 2025, it was reported that Tony-winning actor Bertie Carvel would be portraying the Minister of Magic. Robert Hardy, who died in 2017, played Cornelius Fudge in the Harry Potter movies. 

Perhaps the least well-known actor of the new cast, theater actor Luke Thallon will portray Harry's first Defence Against the Dark Arts teacher. Ian Hart previously portrayed Quirrell, who plays a memorable role in Harry Potter and the Sorcerer's Stone.