Onias IV (Hebrew: חוֹנִיּוֹ Ḥōniyyō) was the son of Onias III and the heir of the Zadokite line of High Priests of Israel. He built a new Jewish temple at Leontopolis in Ptolemaic Egypt where he reigned as a rival High Priest to the hierarchy in Jerusalem. While he never gained leadership in Judea, he still held influence in Egypt; the territory most heavily populated by Jews was called the Land of Onias in reference to his influence.