If You Like Harry Potter...

Mister Monday Nix, Garth (Keys to the Kingdom)

Arthur is saved from a young death by a mysterious key. The key causes bizarre creatures to come from another realm, bringing with them a plague. Arthur must learn the truth about himself and the key before a man name Mister Monday takes the key.

A Wizard of Earthsea Le Guin, Ursula (Earthsea series)

The young boy Sparrowhawk becomes apprentice to a Master Wizard and comes to realize that his fate may be far more important than he ever dreamed possible.

Gathering Blue Lowry, Lois

Lame and suddenly orphaned, Kira is mysteriously removed from her squalid village to live in the palatial Council Edifice, where she is expected to use her gifts as a weaver to do the bidding of the all-powerful Guardians. Sequel: Messenger.

Eragon Paolini, Christopher

In Aagaesia, a 15-year-old boy of unknown lineage called Eragon finds a mysterious stone that weaves his life into an intricate tapestry of destiny, magic and power, peopled with dragons, elves and monsters. Sequel: Eldest.

East Pattou, Edith

A young woman journeys to a distant castle on the back of a great white bear who is the victim of a cruel enchantment.

The Golden Compass Pullman, Philip (His Dark Materials)

Lyra Belacqua sets out to prevent her best friend and other kidnapped children from becoming the subject of gruesome experiments in the Far North. Sequels: The Subtle Knife, and The Amber Spyglass.

The Lightning Thief Riordan, Rick (Percy Jackson & the Olympians)

After learning he is the son of a mortal woman and an Olympian god, 12-yr-old Percy is sent to a summer camp for demigods like himself, and joins his new friends on a quest to prevent a war between the gods. Sequels: The Sea of Monsters, The Titan's Curse.