Harry Potter is not on Disney+ because the rights to the popular franchise are currently owned by WarnerMedia. WarnerMedia, which is a subsidiary of AT&T, has the exclusive distribution rights to the Harry Potter films and is responsible for distributing them through various channels, including streaming services and physical media.

The Harry Potter film franchise has been a major success for Warner Bros. Pictures, the film division of WarnerMedia. The eight films in the franchise, which were released between 2001 and 2011, grossed a total of over $7 billion at the box office worldwide. The films have also been popular on home video and streaming platforms, with fans eager to re-watch their favorite moments from the wizarding world.
When it comes to streaming services, WarnerMedia has its own platform called HBO Max, which launched in 2020. The Harry Potter films are currently available to stream on HBO Max, along with a wide range of other movies and TV shows from Warner Bros. Pictures, HBO, DC Comics, and more. As such, WarnerMedia has no incentive to license the Harry Potter films to other streaming services, including Disney+.
Additionally, there may be legal and contractual issues that prevent the Harry Potter films from being available on Disney+. The distribution rights for the films are likely subject to complex licensing agreements and other legal arrangements that make it difficult for WarnerMedia to share them with other streaming services. Disney, which is a major media conglomerate in its own right, also owns many popular franchises and may be hesitant to pay the high licensing fees that would be required to bring Harry Potter to Disney+.
Despite not having the Harry Potter films, Disney+ has plenty of other content for fans of fantasy and adventure. The streaming service is home to a wide range of popular movies and TV shows, including the Star Wars and Marvel Cinematic Universe franchises, as well as classic Disney films and shows from the company’s extensive library.
In summary, Harry Potter is not on Disney+ because the exclusive distribution rights to the franchise are currently held by WarnerMedia, which has its own streaming service, HBO Max. While there may be legal and contractual issues that prevent the films from being licensed to other streaming services, Disney+ offers plenty of other popular content for fans of all ages.