What is the title of J.K. Rowling's 2015 stage play set in the Harry Potter world?

J.K. Rowling's 2015 stage play set in the Harry Potter world is Harry Potter and the Cursed Child.

The play was written by Jack Thorne and directed by John Tiffany, with a story credited to Thorne, Tiffany and Rowling. It begins nineteen years after the events of Harry Potter and the Deathly Hallows and follows Harry as an adult, along with his son Albus Severus Potter.

Albus becomes friends with Scorpius Malfoy, the son of Draco Malfoy. Their friendship and a time-travel plot drive the central action, while the play explores the relationships between parents and children.

The original West End production opened at the Palace Theatre in London in 2016. The published script is presented as the eighth official story in the Harry Potter series, although it is a stage play rather than a conventional Rowling novel.