Zvi Yehuda Kook (Hebrew: צבי יהודה קוק, born 23 April 1891, died 9 March 1982) was a rabbi, leader of Religious Zionism and Rosh Yeshiva of the Mercaz HaRav yeshiva. He was the son of Rabbi Abraham Isaac Kook, and named in honor of his maternal grandfather's brother, Rabbi Zvi Yehuda Rabinowitch Teomim.
His teachings are partially responsible for the modern religious settlement movement in the West Bank. Many of his ideological followers in the Religious Zionist movement settled there.
Under the leadership of Kook, with its center in the yeshiva founded by his father, Jerusalem's Mercaz HaRav, thousands of religious Jews campaigned actively against territorial compromise, and established numerous settlements throughout the West Bank and Gaza Strip. Many of these settlements were subsequently granted official recognition by Israeli governments, both right and left.
Rav Kook was born in Zaumel in the Kovno Governorate of the Russian Empire (now Žeimelis in Northern Lithuania), where his father was a rabbi. His mother is his father's second wife Reiza Rivka, niece of Eliyahu David Rabinovich-Teomim, Chief Rabbi of Jerusalem along with Shmuel Salant. In 1896 his father with his entire family moved to Bauska, Latvia to be the rabbi there.
Zvi Yehuda (Hebrew: צבי יהודה, born Zvi Zaltzman in 1887, died 3 October 1965) was a Zionist activist and later a politician.
Born in Uman in the Russian Empire (today in Ukraine), Yehuda organised two Zionist youth groups in Uman, Degel Zion and Tzeiri Zion. In 1906 he made aliyah to Ottoman-controlled Palestine, and was amongst the founders of Kvutzat Kinneret in 1908. In 1912 he helped establish Degania, the first kibbutz. During World War I he served as a member of the Galilee Workers Commtitee.
In 1920 Yehuda travelled to Europe to help immigrants of the Third Aliyah. The following year he helped found Nahalal, the first moshav ovdim, and was a director of the Moshav fund and a member of the Moshavim Movement's secretariat, as well as the Farmers Federation and Histadrut trade union. He helped establish Hapoel Hatzair movement, and was a member of its central committee. He also helped establish Hapoel Hatzair and Tzeiri Zion in the United States.
In 1949 he was elected to the first Knesset on the Mapai list. However, he lost his seat in the 1951 elections. He died in 1965.