Harry Potter and the Philosopher's Stone (also known as Harry Potter and the Sorcerer's Stone in the United States, India and Philippines) is a 2001 fantasy film directed by Chris Columbus and produced by David Heyman from a screenplay by Steve Kloves. It is based on the 1997 novel Harry Potter and the Philosopher's Stone by British author J. K. Rowling. It is the first instalment in the Harry Potter film series. The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint in his film debut as Ron Weasley, and Emma Watson in her film debut as Hermione Granger. Its story follows Harry's first year at Hogwarts School of Witchcraft and Wizardry as he discovers that he is a famous wizard and begins his formal wizarding education.

Warner Bros. Pictures bought the film rights to the book in 1999 for a reported £1 million ($1.65 million). Production began in the United Kingdom in 2000, with Columbus being chosen to helm the film from a short list of directors that included Steven Spielberg and Rob Reiner. Rowling insisted that the entire cast be British and Irish, with the three leads chosen in August 2000 following open casting calls. Filming took place at Leavesden Film Studios and historic buildings around the United Kingdom from September 2000 to March 2001.

Harry Potter and the Philosopher's Stone was released to cinemas in the United Kingdom and Ireland on 10 and 11 November 2001 for two days of previews. The film opened on 16 November in the United States, Canada, and Taiwan as well as officially in the United Kingdom and Ireland. It became a critical and commercial success, grossing $974 million at the worldwide box office during its initial run and over $1 billion with subsequent re-releases against a $125 million budget. It became the highest-grossing film of 2001 and the second-highest-grossing film at the time. The film was nominated for many awards, including Academy Awards for Best Original Score, Best Art Direction and Best Costume Design. It was followed by seven sequels, beginning with Harry Potter and the Chamber of Secrets in 2002 and ending with Harry Potter and the Deathly Hallows – Part 2 in 2011.