Allanon is a fictional character from the Shannara series of novels by Terry Brooks. He first appeared in The Sword of Shannara, the first book in the series, and played a pivotal role in the first trilogy.

Allanon is described as seven feet tall, with a booming voice and cowled face. He is the adopted son of Bremen of the Druidic Order, and he carries on his father's legacy as last of the Druids, preserving the knowledge of ancient times, but knowing that it is dangerous.

Because of this he is enigmatic and secretive. He appears only when needed, passing decades in a form of suspended animation called Druid sleep. He often calls on the aid of the Ohmsford family, the inheritors of the magic of Jerle Shannara, yet he is never completely honest with his companions. His words, which are few, are clouded in half-truths; his friends are always on a "need-to-know" basis.

In The Sword of Shanarra he calls on Shea Ohmsford to retrieve the lost Sword and use it to destroy the Warlock Lord. In The Elfstones of Shannara, when the Four Lands were under attack from Demons, he sent Shea's grandson Wil on a quest to recreate the magic tree that had held them back, while Allanon himself battled the Demon hordes. Allanon went on one last journey with Wil's daughter, Brin, to stop the Mord Wraiths and destroy the Ildatch, a malevolent spellbook, in The Wishsong of Shannara. He was killed in battle with an ancient being called a Jachrya. Brin succeeded in giving Allanon his peace by destroying the Ildatch, the Druid's final task.

Allanon appears as a young boy in the prequel First King of Shannara.