Even though it's not even spoken anymore!
Bloomsbury told CBBC Newsround's website the book - Harrius Potter et Philosophi Lapis - comes out in July as a special hardback version. At the same time, a version in Welsh will hit the shelves.
They reckon it's a great idea because there are lots of references to ancient classical stories. JK's books also use loads of Latin words and phrases too.
Loadsa languages
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