William de Tulloch (died 1482) was a 15th-century Scottish prelate. A native of Angus, he became a canon of Orkney, almost certainly brought there by his relative Thomas de Tulloch, Bishop of Orkney. He was provided to the bishopric upon the resignation of his cousin by Pope Pius II at the Apostolic see on 11 December 1461. He had been consecrated by 21 July 1462, when he rendered an oath of fealty at Copenhagen to Christian I, King of Denmark, Norway and Sweden.