Kit Harington Cast as Gilderoy Lockhart in Harry Potter Season 2

Game of Thrones star Kit Harington has been cast as Gilderoy Lockhart in the second season of HBO’s Harry Potter television series, replacing Nicholas Hoult, who left the role due to scheduling conflicts. The announcement was reported on August 24, 2026. Harington, known for his role as Jon Snow, steps into the part of the vain and boastful wizard who becomes the new Defense Against the Dark Arts professor at Hogwarts in the adaptation of J.K. Rowling’s second novel, Harry Potter and the Chamber of Secrets.