What is the subtitle of the 2016 Harry Potter stage play co-written by J.K. Rowling?

The subtitle of the 2016 Harry Potter stage play co-written by J.K. Rowling is The Cursed Child.

Harry Potter and the Cursed Child is based on an original story by Rowling, John Tiffany, and Jack Thorne. Thorne wrote the script, while Tiffany directed the original production. The play is set nineteen years after the epilogue of Harry Potter and the Deathly Hallows.

Its central relationship is between Harry’s son Albus Severus Potter and Draco Malfoy’s son Scorpius Malfoy. Their friendship leads to time-travel consequences involving events from the earlier books.

The original production opened in London’s West End in 2016. It was presented in two parts, although many later productions have used a single-part version.