Which Harry Potter novel is the longest in the English-language editions?

Harry Potter and the Order of the Phoenix is the longest Harry Potter novel in the English-language editions.

Published in 2003, the fifth novel contains 766 pages in its original United Kingdom hardback edition and 870 pages in the United States edition. Page counts vary by format, language and printing, but the book remains the longest of the seven English novels.

The story introduces the revived Order of the Phoenix as a major resistance group and follows Harry’s conflict with the Ministry of Magic and Dolores Umbridge. It also features the formation of Dumbledore’s Army.

Some readers guess Harry Potter and the Deathly Hallows because it is the concluding novel, or Goblet of Fire because of its many plotlines. Neither is the longest by the standard English editions.