Does anyone know how much my first edition harry potter 6 is worth?
It will be worth very little. The first edition print of Harry Potter 6 was huge and of course, everyone rushed out and bought it, so everyone owns a first edition. First editions only become worth a lot when they are incredibly rare and therefore hard to get hold of. If you had a first edition copy of Harry Potter 1 it would be worth a lot of money to a collector, however the market is flooded with first editions of number 6.