It never actually says in the books or the movies.
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Dumbledore's patronus was a phoenix. He used his patronus in Goblet of Fire, chapter 28 to send a message.
Her patronus is a swan.
It's Luna Lovegood, she has the hare patronus.
It's Cedric Diggory (the actor who played him is Robert Pattinson).
A stag, the same animal his father turned into and likely the same patronus.