Which J.K. Rowling Harry Potter book features the introduction of Luna Lovegood?

Harry Potter and the Order of the Phoenix features the introduction of Luna Lovegood. J.K. Rowling’s fifth Harry Potter novel, published in 2003, presents Luna as a Ravenclaw student who joins Harry’s circle of allies.

Luna is the daughter of Xenophilius Lovegood, editor of the magazine The Quibbler. She is known for her unusual beliefs, eccentric manner, and willingness to consider possibilities that other students dismiss. Despite being teased at Hogwarts, Luna proves loyal and courageous.

She becomes a member of Dumbledore’s Army, the student group Harry helps organize to practise defensive magic. Luna later takes part in major conflicts, including the Battle of Hogwarts. Her introduction in the fifth novel expands the series’ cast with a character whose unconventional outlook contrasts with the more conventional attitudes of many classmates.