Rabbi Isser Yehuda Unterman was the Ashkenazi Chief Rabbi of Israel from 1964 until 1972.
Born in Brest-Litovsk in modern Belarus, Unterman was educated at the Etz Chaim Yeshiva in Maltsch. There, he became a pupil of its Rosh Yeshiva, Rabbi Shimon Shkop. Returning to Lithuania to complete his studies, Unterman was ordained as a rabbi by Rabbi Refael Shapiro and opened his own yeshiva in the town of Vishova around 1910. Unterman served a variety of roles in the Lithuanian Jewish community until 1924, when he was selected to become the head rabbi of Liverpool. Unterman served in Liverpool for 22 years, becoming an important figure in the English Zionist movement and working to relieve the suffering of refugees in England during the Second World War.
In 1946, Unterman became the Chief Rabbi of Tel Aviv, a position he held for twenty years before being appointed Chief Rabbi of Israel. As Chief Rabbi, Unterman worked to reform the rabbinic court system and reach out to secular Israelis. He also wrote opinions on a variety of religious issues relevant to the young Jewish state, such as religious conversion and marriage law.
Unterman died in 1976.