Which Harry Potter novel by J.K. Rowling was adapted into the first film?

Harry Potter and the Philosopher's Stone was the J.K. Rowling novel adapted into the first Harry Potter film.

The book was published in Britain in 1997 and introduces Harry, Ron Weasley, Hermione Granger, Hogwarts, and the mystery of the Philosopher's Stone. The film adaptation, directed by Chris Columbus, premiered in 2001.

In the United States, both the book and film used the title Harry Potter and the Sorcerer's Stone. The two titles refer to the same story and the same magical object, so American and British sources can appear to give different answers.

The first film established the visual and casting foundations for the wider series. It was followed by film adaptations of the remaining six novels, with the final novel split across two movies.