Core Subjects:
* Transfiguration: Turning objects into other things, taught by Professor Minerva McGonagall.
* Charms: Spells for a variety of purposes, taught by Professor Filius Flitwick.
* Potions: Brewing magical concoctions, taught by Professor Severus Snape.
* Defense Against the Dark Arts: Learning to defend against dark magic, taught by Professor Remus Lupin (who is actually a werewolf!).
* History of Magic: Learning about the history of wizarding world events, taught by Professor Cuthbert Binns (a ghost!).
* Herbology: Studying magical plants, taught by Professor Pomona Sprout.
* Astronomy: Learning about the stars and their magical properties, taught by Professor Aurora Sinistra.
Electives:
* Divination: Learning to predict the future, taught by Professor Sybill Trelawney (a very eccentric teacher!).
* Care of Magical Creatures: Learning about magical creatures, taught by Professor Rubeus Hagrid.
* Flying: Learning to fly on broomsticks, taught by Madam Hooch.
Note: Harry didn't take all the electives in his third year. He chose Divination, Care of Magical Creatures, and of course, continued with Flying.