Which Harry Potter novel was the first J.K. Rowling book to be adapted into two films?

Harry Potter and the Deathly Hallows was the first J.K. Rowling book adapted into two films.

The final novel in the series was released in 2007. Its film adaptation was divided into Harry Potter and the Deathly Hallows – Part 1, released in 2010, and Part 2, released in 2011. The split allowed the filmmakers to include more of the book’s extensive final storyline.

The earlier books each received one feature-film adaptation, although their stories were also condensed. The decision to divide the final installment reflected both its length and the importance of its multiple plotlines, including the search for Horcruxes, the battle at Hogwarts, and the resolution of Harry’s conflict with Voldemort.

The two films were directed by David Yates and featured the returning principal cast. Part 2 became the final cinematic chapter of the original Harry Potter film series. The book itself remains one novel, despite producing two films.