Which Harry Potter book did J.K. Rowling describe as her favorite to write?

J.K. Rowling described Harry Potter and the Prisoner of Azkaban as her favorite Harry Potter book to write.

The third novel in the series was published in the United Kingdom in 1999. It introduces Sirius Black, Remus Lupin, Peter Pettigrew, and the Dementors, while expanding the backstory of Harry’s parents and their friends. The novel’s central revelation changes Harry’s understanding of his family history without featuring Lord Voldemort as the main active antagonist.

Rowling has discussed the book fondly, and it is often identified as her favorite to write. That is a statement about her creative experience, not an objective ranking of the novels or a claim that it sold the most copies.

The film adaptation, directed by Alfonso Cuarón, was released in 2004. Its visual style and treatment of the Hogwarts school year helped distinguish it from the first two films.