Which Harry Potter book was adapted into two films, according to J.K. Rowling’s series?

Harry Potter and the Deathly Hallows was adapted into two films.

The final novel in J.K. Rowling’s seven-book series was published in 2007. Warner Bros. adapted it as Harry Potter and the Deathly Hallows – Part 1, released in 2010, and Part 2, released in 2011.

Splitting the conclusion allowed the filmmakers to retain more of the book’s plot and characters than a single film might have allowed. Part 2 brought the main film series to its dramatic conclusion.

The earlier six novels each received one feature-film adaptation, so the decision created eight films from seven books. This is why references to the “eight Harry Potter films” do not imply that Rowling wrote eight main novels.