Mordechai Tzemach Eliyahu (Hebrew: ????? ??? ?????, March 3, 1929 – June 7, 2010, on the Hebrew calendar: 21 Adar I, 5689 - 25 Siwan, 5770), was a prominent rabbi, posek, and spiritual leader.
He served as the Rishon LeZion (Chief Rabbi of Israel) from 1983 to 1993.