Which Harry Potter book by J.K. Rowling was published in 2003?

Harry Potter and the Order of the Phoenix was published in 2003. It is the fifth novel in J.K. Rowling’s original Harry Potter series.

The book was published in the United Kingdom on 21 June 2003. It follows Harry’s return to Hogwarts for his fifth year and focuses on the Ministry of Magic’s refusal to accept that Lord Voldemort has returned. The school is placed under the authority of Dolores Umbridge, whose policies lead Harry and his classmates to form Dumbledore’s Army.

The title refers to the revived Order of the Phoenix, a group originally formed by Albus Dumbledore to oppose Voldemort. Sirius Black, Remus Lupin, and other members play important roles in the wider conflict.

The novel is the longest in the original series by word count in its standard English editions. Its publication date is often confused with that of Harry Potter and the Goblet of Fire, which appeared in 2000, or Harry Potter and the Half-Blood Prince, which followed in 2005.