Great fantasy novels for teens!

 Abarat by Clive Barker

Candy Quackenbush of Chickentown, Minnesota, one day finds herself on the edge of a foreign world that is populated by strange creatures, and her life is forever changed.  Sequels:  Days of Magic, Days of War and Absolute Midnight.

The Goblin Wood by Hilari Bell

A young hedgewitch, an idealistic knight, and an army of clever goblins fight against the ruling hierarchy that is trying to rid the land of all magical creatures.  Sequels:  The Goblin Gate and The Goblin War.

 White Cat by Holly Black

When Cassel Sharpe discovers that his older brothers have used him to carry out their criminal schemes and then stolen his memories, he figures out a way to turn their evil machinations against them.  Sequels:  Red Glove and Black Heart.

 The Demon’s Lexicon by Sarah Rees Brennan

Sixteen-year-old Nick and his family have battled magicians and demons for most of his life, but when his brother, Alan, is marked for death while helping new friends Jamie and Mae, Nick's determination to save Alan leads him to uncover a devastating secret.  Sequels:  The Demon’s Covenant and The Demon’s Surrender.

The Warrior Heir by Cynda Williams Chima

After learning about his magical ancestry and his own warrior powers, sixteen-year-old Jack embarks on a training program to fight enemy wizards.  Sequels:  The Wizard Heir and The Dragon Heir.

The Demon King by Cynda Williams Chima

Relates the intertwining fates of former street gang leader Han Alister and headstrong Princess Raisa, as Han takes possession of an amulet that once belonged to an evil wizard and Raisa uncovers a conspiracy in the Grey Wolf Court.  Also available as an ebook.  Sequels:  The Exiled Queen,  The Gray Wolf Throne and The Crimson Crown.

 City of Bones by Cassandra Clare

Suddenly able to see demons and the Darkhunters who are dedicated to returning them to their own dimension, fifteen-year-old Clary Fray is drawn into this bizarre world when her mother disappears and Clary herself is almost killed by a monster.  Sequels:  City of Ashes, City of Glass, City of Fallen Angels and City of Lost Souls.

The Clockwork Angel by Cassandra Clare

When sixteen-year-old orphan Tessa Fell's older brother suddenly vanishes, her search for him leads her into Victorian-era London's dangerous supernatural underworld, and when she discovers that she herself is a Downworlder, she must learn to trust the demon-killing Shadowhunters if she ever wants to learn to control her powers and find her brother.  Sequel:  The Clockwork Prince.

Eon: Dragoneye Reborn by Allison Goodman

Sixteen-year-old Eon hopes to become an apprentice to one of the twelve energy dragons of good fortune and learn to be its main interpreter, but to do so will require much, including keeping the secret that she is a girl.  Sequel:  Eona: The Last Dragoneye.

Firelight by Sophie Jordan

When sixteen-year-old Jacinda, who can change into a dragon, is forced to move away from her community of shapeshifters and start a more normal life, she falls in love with a boy who proves to be her most dangerous enemy.  Sequels:  Vanish and Hidden.

Keturah and Lord Death by Martine Leavitt

When Lord Death comes to claim sixteen-year-old Keturah while she is lost in the King's Forest, she charms him with her story and is granted a twenty-four hour reprieve in which to seek her one true love.

 Wildwood Dancing by Juliet Marillier

Five sisters who live with their merchant father in Transylvania use a hidden portal in their home to cross over into a magical world, the Wildwood.  Sequel:  Cybele’s Secret.

Wicked Lovely by Melissa Marr

Seventeen-year-old Aislinn, who has the rare ability to see faeries, is drawn against her will into a centuries-old battle between the Summer King and the Winter Queen, and the survival of her life, her love, and summer all hang in the balance.  Sequels:  Ink Exchange, Fragile Eternity, Radiant Shadows and Darkest Mercy.

 Eragon by Christopher Paolini

In Aagaesia, a fifteen-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.  Available as an ebook.  Sequels:  Eldest, Brisingr and Inheritance.  Eldest, Brisingr and Inheritance also available as ebooks.

 Sisters Red by Jackson Pearce

After a Fenris, or werewolf, killed their grandmother and almost killed them, sisters Scarlett and Rosie March devote themselves to hunting and killing the beasts that prey on teenaged girls, learning how to lure them with red cloaks and occasionally using the help of their old friend, Silas, the woodsman's son.

 Terrier by Tamora Pierce

When sixteen-year-old Beka becomes "Puppy" to a pair of "Dogs," as the Provost's Guards are called, she uses her police training, natural abilities, and a touch of magic to help them solve the case of a murdered baby in Tortall's Lower City.  Also available as an ebook.  Sequels:  Bloodhound and Mastiff.  Bloodhound also available as an ebook.

 Silver Phoenix by Cindy Pon

With her father long overdue from his journey and a lecherous merchant blackmailing her into marriage, seventeen-year-old Ai Ling becomes aware of a strange power within her as she goes in search of her parent.  Sequel:  Fury of the Phoenix.

 The Wee Free Men by Terry Pratchett

Tiffany Aching, a young witch-to-be, is forced into Fairyland to seek her kidnaped brother and allies herself with the Chalk's local Nac Mac Feegle -- aka the Wee Free Men -- a clan of sheep-stealing, sword-wielding, six-inch-high blue men who are as fierce as they are funny.  Sequels:  A Hat Full of Sky, Wintersmith and I Shall Wear Midnight.

The Alchemyst by Michael Scott

While working at pleasant but mundane summer jobs in San Francisco, fifteen-year-old twins, Sophie and Josh, suddenly find themselves caught up in the deadly, centuries-old struggle between rival alchemists, Nicholas Flamel and John Dee, over the possession of an ancient and powerful book holding the secret formulas for alchemy and everlasting life.  Sequels:  The Magician, The Sorceress, The Necromancer, and The Warlock.  The Alchemyst, The Magician, The Sorceress, The Necromancer and The Warlock are also available as ebooks.

Daughter of Smoke and Bone by Laini Taylor

Seventeen-year-old Karou, a lovely, enigmatic art student in a Prague boarding school, carries a sketchbook of hideous, frightening monsters--the chimaerae who form the only family she has ever known.  Sequel:  Days of Blood and Starlight.

The New Policeman by Kate Thompson

Irish teenager JJ Liddy discovers that time is leaking from his world into Tir na nOg, the land of the fairies, and when he attempts to stop the leak he finds out a lot about his family history, the music that he loves, and a crime his great-grandfather may or may not have committed.  Also read The Last of the High Kings and The White Horse Trick.

 Zombies vs Unicorns edited by Justine Larbalestier and Holly Black

Short stories answering the age old question, “Which is better, zombies or unicorns?”