Kook or Cook is a Jewish surname. Notable people with the surname include:
Abraham Isaac Kook (1865–1935), Chief Rabbi in the British Mandate of Palestine, considered to be Israel's first Ashkenazi Chief Rabbi
Zvi Yehuda Kook (1891–1982), son of the above, prominent Religious Zionist rabbi
Hillel Kook (1915–2001), nephew of Abraham Isaac Kook, prominent Revisionist Zionism activist during World War II