Harry Potter has been translated into Hindi books and into Hindi audio books, and even into Hindi video. You can also get Hindi Children’s books and videos at Multilingual Books.

Harry Potter and the Philosopher’s stone – Hindi sample

Harry Potter Audio Book in Hindi

Harry Potter and the Philosopher's Stone hindi audio book ch 2

Here is the full list of Harry Potter titles in Hindi
Harry Potter aur Paaras Pathar 1 (paperback)
Harry Potter aur Rahasyamayi Tehkhana 2 (paperback) Harry Potter aur Azkaabaan ka Qaidi 3 (paperback) Harry Potter aur Aag ka Pyaala 4 (paperback)
Harry Potter aur Mayapanchhi ka Samooh 5 (paperback)
Harry Potter aur Half-Blood Prince 6 (paperback) - now available!
Harry Potter aur Maut Ke Tohfe 7 (paperback) - now available!