Conrad of Dhaun (c. 1380 – 1434) was a German nobleman. His relatives were the Wild- and Rhinegraves of Dhaun. He was Archbishop and Prince-elector of the Bishopric of Mainz from 1419 until his death as Conrad III. His term was marked by the Hussite wars and by serious disputes with the Landgraviate of Hesse and within the city of Mainz.