Harry Potter and the Order of the Phoenix (original title in English, Harry Potter and the Order of the Phoenix), is the fifth book of the Harry Potter series, written by British author J. K. Rowling in 2003.

The events begin a few weeks after what happened in Harry Potter and the Goblet of Fire, and narrates the reaction of the Ministry of Magic to the announcement of the return of the dangerous sorcerer Lord Voldemort. The minister Cornelius Fudge undertakes a zealous surveillance on Hogwarts school, since he is convinced that the director Albus Dumbledore has invented the story about the resurrection of that dark wizard to cause instability and take power. With this reaction, Voldemort and his Death Eaters have the green light to act in the shadows and prepare their forces to destroy the balance of the wizarding community and take it over. This book marks the definitive beginning of the Second Wizarding War, a conflict that continues until the last novel in the heptalogy: Harry Potter and the Deathly Hallows.

The publication of the book took place three years after its predecessor. It was published on June 21, 2003 in the United Kingdom, the United States, Canada, Australia, 1 among others. It sold two million copies in the United Kingdom on launch day and five that same weekend in the United States.2 It consists of 38 chapters and 893 pages in the Spanish edition published by the Salamandra publishing house, 1 for which it is became the longest book in the series. In addition, this novel marked a turning point in the saga, by tackling new themes and arousing criticism from some readers, who saw in this episode a "stagnation" of the series. However, the specialized critics celebrated, for the most part, the changes that this story introduced throughout the work.