Which Harry Potter novel is the only one whose title includes the word “Prince”?

Harry Potter and the Half-Blood Prince is the only Harry Potter novel whose title includes the word “Prince.”

It is the sixth novel in J.K. Rowling’s series and was published in the United Kingdom on 16 July 2005. Much of the story explores Lord Voldemort’s past and the method he used to preserve his life through Horcruxes.

The Half-Blood Prince is a mysterious identity connected to an annotated Potions textbook. Harry benefits from notes in the book before discovering that its former owner was Severus Snape. “Half-blood” describes Snape’s parentage, while “Prince” comes from his mother’s surname.

The title is sometimes mistaken for a reference to Harry himself or to a royal character. It is neither: the Half-Blood Prince is Snape’s self-chosen name. The book was adapted as the sixth film in the series in 2009.