Which Harry Potter novel is the longest in the original seven-book series by page count?

Harry Potter and the Order of the Phoenix is the longest Harry Potter novel by page count in the original seven-book series.

The English-language U.S. edition has 870 pages, while the standard U.K. hardback edition has 766 pages. Page totals vary by edition, language, format, and typesetting, but Order of the Phoenix is generally identified as the longest book in the series.

The novel was published in 2003 and follows Harry’s fifth year at Hogwarts. It introduces the student group Dumbledore’s Army and develops the conflict between the wizarding community and the returning Voldemort.

Length comparisons can be misleading when based on different editions. Goblet of Fire is also substantial, and Deathly Hallows is often remembered as large, but the commonly cited page-count record belongs to Order of the Phoenix.