William of Alnwick (lat. Guillelmus Alaunovicanus, c. 1275 – March 1333) was a Franciscan friar and theologian, and bishop of Giovinazzo, who took his name from Alnwick in Northumberland. Little is known of his early life. By 1303 he was a licensed doctor of theology at Paris, being then listed among the few foreign masters who sided with Philip IV, king of France, in his dispute with Pope Boniface VIII. Alnwick also lectured at other European centres of learning, including Montpellier, Bologna and Naples. He must have returned to England sometime in the second decade of the 14th century, as he is recorded as the forty-second Franciscan regent master at Oxford University, when Henry Harclay was chancellor of the university.