Which Harry Potter book was the first to use the title “Harry Potter and the Deathly Hallows”?

Harry Potter and the Deathly Hallows was the seventh book in J.K. Rowling’s main Harry Potter series.

Published in 2007, it concludes the central story of Harry’s conflict with Lord Voldemort. The title refers to three legendary magical objects—the Elder Wand, the Resurrection Stone, and the Cloak of Invisibility—which become important to the plot.

The series contains seven main novels, matching the seven school years Harry is expected to spend at Hogwarts, although the story does not depict every year in exactly the same way. Deathly Hallows follows Harry, Ron, and Hermione away from normal school life as they pursue the remaining Horcruxes.

The final novel was adapted into two films, released in 2010 and 2011. That split can lead people to describe it as two books, but it remains one novel.