Yaakov Hai Zion Ades (Hebrew: יעקב חי ציון עדס‎, February 24, 1898 – July 19, 1963), also spelled Adas or Adess, was a Sephardi Hakham, Rosh Yeshiva, and Rabbinical High Court judge. As rosh yeshiva of Porat Yosef Yeshiva in Jerusalem, he raised thousands of students, including Rabbi Ovadia Yosef, Sephardic Chief Rabbi of Israel; Rabbi Ben Zion Abba Shaul, rosh yeshiva of Porat Yosef; and Rabbi Yehuda Hakohen Rabin, Chief Rabbi of Bukharan Jewry in Israel.