Harry Potter is an upcoming fantasy television series developed for HBO. The series is based on the series of fantasy books of the same name by English author J. K. Rowling. Produced by HBO Entertainment, Warner Bros. Television, Brontë Film & TV, and Heyday Films, the series stars Dominic McLaughlin as Harry Potter, with Alastair Stout as Ron Weasley and Arabella Stanton as Hermione Granger. Also starring John Lithgow as Hogwarts Headmaster Albus Dumbledore, Janet McTeer as Professor Minerva McGonagal, Paapa Essiedu as Professor Severus Snape and Nick Frost as Hogwarts Gamekeeper Rubeus Hagrid.

Development on a Harry Potter series was revealed to have begun by January 2021, with a plan for a series spanning a decade as part of a faithful adaptation of the books. Creatively led by showrunner Francesca Gardiner and director Mark Mylod, casting for major roles began in November 2024, and confirmation came by April 2025. A casting call for the main roles of Harry, Ron, and Hermione was issued in September 2024; after considering 32,000 actors, McLaughlin, Stout, and Stanton were revealed to have been cast in May 2025. Principal photography began that July at Leavesden Studios in Hertfordshire, England.

Originally set for a HBO Max release, the series shifted to an HBO release by June 2024. Harry Potter is scheduled to premiere on HBO in the United States in early 2027, with the first season consisting of eight episodes.

Harry Potter is a co-production by HBO, Warner Bros. Television, Brontë Film and TV, and Heyday Films. Showrunner Francesca Gardiner and director Mark Mylod serve as executive producers alongside J. K. Rowling, Neil Blair, Ruth Kenley-Letts, and David Heyman.

Harry Potter is a series of seven fantasy novels written by Rowling from 1997 to 2007. From 2001 to 2011, these were adapted into eight eponymous films, with the final book, Deathly Hallows, split into two feature-length films. Both the books and films have had a notable impact on popular culture; the books have been translated into more than eighty languages, and the film series is the fourth highest-grossing film franchise of all time, with the eight films released collectively grossing over $7.7 billion worldwide.

In January 2021, The Hollywood Reporter revealed that a Harry Potter television series was in early development and that HBO Max executives were looking for potential writers. However, HBO Max and Warner Bros. denied the report, saying there was no Harry Potter series in development at the studio or on the streaming platform. By May 2022, reports circulated about the announced meeting between Warner Bros. Discovery CEO David Zaslav and Rowling in their discussion for future HBO Max projects set within the Wizarding World franchise.

In December 2022, it was reported that Warner Bros. Television CEO Channing Dungey shared plans to expand the Wizarding World franchise. In April 2023, at a Warner Bros. investors meeting, it was announced that the series was in development. Warner Bros. Discovery CEO Zaslav revealed plans for the series during a presentation for the new streaming service Max, the successor to HBO Max. The series would be developed over a decade, and each season would be "faithful" to the book series. A search for a showrunner was underway, while David Heyman was in talks to executive produce after serving as a producer of the film series. The first season is expected to cover the entirety of the first book, Harry Potter and the Philosopher's Stone (1997). After Rowling was confirmed to be an executive producer on the series, this caused backlash due to the controversy she previously attracted over her views on transgender issues, but HBO and HBO Max chairman and CEO Casey Bloys confirmed her involvement. Neil Blair and Ruth Kenley-Letts were set as executive producers on the series by April 2023.

Deadline Hollywood stated that by February 2024, there was a shortlist of three candidates to be the series' creative leader, including Succession writer Francesca Gardiner. In June, Gardiner was hired as the showrunner and writer, and Mark Mylod was hired to direct several episodes of the series. Moreover, both of them and Heyman were announced as executive producers. As part of a strategy shift for content, Harry Potter was moved from Max streaming to HBO network release in June 2024. The series is planned to be produced for ten consecutive years, according to comments Bloys and Zaslav made in 2023 and 2025.