What was the title of the 2016 stage play co-written by J.K. Rowling?

The 2016 stage play co-written by J.K. Rowling was Harry Potter and the Cursed Child.

The play was written by Jack Thorne and directed by John Tiffany, with Rowling credited for the original story. It is set nineteen years after the conclusion of Harry Potter and the Deathly Hallows and follows Harry as an adult employee of the Ministry of Magic. His son Albus Severus Potter is a central character.

The story explores the difficult relationship between Harry and Albus, as well as Albus’s friendship with Scorpius Malfoy. The production opened in London’s West End in 2016 and later played in other cities.

The published script is sometimes described as an eighth Harry Potter book, but it is a stage-play script rather than a novel. Rowling’s original seven novels remain the main prose series, while Cursed Child was created specifically for theatrical performance.