Which Harry Potter novel did J.K. Rowling publish in 2005?

J.K. Rowling published Harry Potter and the Half-Blood Prince in 2005.

The sixth Harry Potter novel was released on 16 July 2005. It follows Harry during his sixth year at Hogwarts, where he receives a mysterious Potions textbook marked as belonging to the Half-Blood Prince. The book also develops the investigation into Lord Voldemort’s past.

A major strand of the story involves Professor Albus Dumbledore showing Harry memories connected with Tom Riddle. These memories help explain how Voldemort pursued immortality and provide information crucial to the final novel.

The title’s Half-Blood Prince is not a separate adult wizard or an additional villain. It is a nickname used by a central character, and the identity is revealed within the novel. The film adaptation, released in 2009, is based on this sixth book.