In which Harry Potter film does Luna Lovegood first appear?

Luna Lovegood first appears in Harry Potter and the Order of the Phoenix.

The character is introduced as a Ravenclaw student on the Hogwarts Express. Played by Evanna Lynch, Luna becomes one of Harry’s allies during his fifth year and joins Dumbledore’s Army, the student group formed to practise defensive magic under Harry’s instruction.

Luna is known for her unusual observations, calm manner, and willingness to believe ideas that other students dismiss. Her introduction also expands the film’s portrayal of Hogwarts beyond Harry’s closest friends and the familiar Gryffindor characters.

Some viewers associate Luna more strongly with later events, especially the hunt for the Horcruxes and the Battle of Hogwarts. However, her first film appearance is in the fifth movie, released in 2007, rather than in Goblet of Fire.