Harry Potter and the Philosopher's Stone has been translated into over 60 languages, including Ancient Greek and Classical Latin. (When it was translated into American English, the publishers even decided to change the title!)
To find out more about the Ancient Greek translation, you can visit Andrew Wilson's Classics Pages, where you will also find some vocabulary and notes to accompany your reading. If you want to know just why Andrew decided to translate Rowling's work, you should read this article from the Opinion Journal.
