Aul is a fictional character from J. R. R. Tolkien's legendarium.

Aul the Smith (from Valarin Aȝ z—the second character is a yogh) is a Vala, Smith of the Powers and concerned with rock and metal. During the creation of Arda, Aul was most involved in building the continents and mountains. He constructed Angainor, the chain of Melkor, and the vessels of the Sun and Moon. He is husband to Yavanna. His name apparently means invention.

Aul created his own race of beings, the Dwarves, because he was unwilling to wait for the Children of Il vatar to appear. Il vatar knew of this and even as Aul was instructing them He chastened Aul . Aul repented, offering his children to Il vatar, and Il vatar accepted them as His adopted children. Since Il vatar had decided that the Elves were to be the first-born race, He made the Dwarves to sleep until the Elves appeared on Arda.

When the Elves came to Valinor, the oldor became the students of Aul . F anor was his greatest pupil, and from him learned the craft to make the Silmarils. On the Flight of the oldor, the oldor who returned to Valinor under Finarfin renamed themselves Aulendur, Followers of Aul .

Several Maiar where associated with Aul : Sauron, before being corrupted by Melkor; and Curumo, who later went to Middle-earth as an Istar to combat Sauron.