Vazul [Basil] (11th century) was a Hungarian noble of the Árpad family. He was the grandson of Taksony by his father Michael. His brother was Ladislaus the Bald. He was a cousin of Stephen I of Hungary.

Of Vazul's three sons, András, Béla and Levente, two would ascend the throne after the dynastic struggle following the death of Stephen I. The line of Árpad kings following Stephen is therefore referred to as the Vazul line.