Key: Last Name, First Name - Book first appears in. Short summary.
Hagrid, Rubeus - Book 1. Half-giant who saved Harry from his destroyed home, and helped him get accquainted with the wizarding world.
Hedwig - Book 1. Harry's faithful owl who sends mail to his friends.
Hermes - Book 2. Percy's owl.
He-Who-Must-Not-Be-Named - See Voldemort.
Higgs, Terence - Book 1. Quidditch Seeker for Slytherin in the first book.
Hooch, Madam - Book 1. The flying instructor for Hogwarts.
Hopkirk, Mafalda - Book 2. Member of the Improper Use of Magic office.
Hufflepuff, Helga - Book 2. One of the Founders of Hogwarts.