What is the title of the eighth Harry Potter story, written by J.K. Rowling with Jack Thorne and John Tiffany?

The eighth Harry Potter story is Harry Potter and the Cursed Child.

The work is a stage play by Jack Thorne, based on an original story by J.K. Rowling, John Tiffany, and Thorne. It begins nineteen years after the events of Harry Potter and the Deathly Hallows and follows adult Harry, now a Ministry of Magic employee, and his son Albus Severus Potter.

The play premiered in London’s West End in 2016 and was published as a script book. It is not an eighth prose novel by Rowling. That distinction matters because the original Harry Potter series consists of seven novels, while Cursed Child is a theatrical continuation.