Harry Potter an the Order of the Phoenix is the fifth novel in the Harry Potter series written by J. K. Rowling. It is the longest book in the series, and was released on 21 June 2003. The novel features Harry's struggles through his fifth year at Hogwarts, including the surreptitious return of Harry's nemesis Lord Voldemort, O.W.L. exams, awkward teenage love and an obstructive Ministry of Magic. The book has been made into a film, which was released in 2007.