Yitzhak HaLevi Herzog (Hebrew: יצחק אייזיק הלוי הרצוג; 3 December 1888 – 25 July 1959), also known as Isaac Herzog or Hertzog, was the first Chief Rabbi of Ireland, his term lasted from 1921 to 1936. From 1936 until his death in 1959, he was Ashkenazi Chief Rabbi of the British Mandate of Palestine and of Israel after its independence in 1948. He was the father of Chaim Herzog and grandfather of Isaac Herzog, both presidents of Israel.