Harry Potter and the Order of the Phoenix is a fantasy novel written by British author J. K. Rowling and the fifth novel in the Harry Potter series. It follows Harry Potter's struggles through his fifth year at Hogwarts School of Witchcraft and Wizardry, including the surreptitious return of the antagonist Lord Voldemort, O.W.L. exams, and an obstructive Ministry of Magic. The novel was published on 21 June 2003 by Bloomsbury in the United Kingdom, Scholastic in the United States, and Raincoast in Canada. It sold five million copies in the first 24 hours of publication.

The Ministry of Magic is the government of the Magical community of Britain in J. K. Rowling's Wizarding World, headed by an official entitled the Minister for Magic. The magical government in Britain is first mentioned in Harry Potter and the Philosopher's Stone; the Ministry makes its first proper appearance in Harry Potter and the Order of the Phoenix (2003). Throughout the books, it is regularly depicted as corrupt, elitist and completely incompetent, with its high-ranking officials blind to ominous events and unwilling to take action against threats to wizard society. In Order of the Phoenix, Dolores Umbridge was placed at Hogwarts to observe the happenings within the school, and prevent the spread of news concerning the return of Lord Voldemort. It reaches a zenith of corruption, before being effectively taken over by Voldemort. At the end of the final book, following Voldemort's death, Kingsley Shacklebolt is revealed to have become the Minister for Magic.