Yaakov Herzog (Hebrew: יעקב דוד הרצוג, 11 December 1921 – 9 March 1972) was an Irish-born Israeli diplomat.

[1] Herzog helped improve relations with the Vatican after the Six-Day War, and led diplomatic communications with King Hussein of Jordan.

He held secret talks with Hussein in a London clinic that opened the way to peace between Jordan and Israel, established secret contacts with Lebanese Christians, helped the Imam of Yemen against his enemies, and became a personal friend to President Kennedy, Secretary of State John Foster Dulles, Ireland's leader Éamon de Valera and other world figures.

[2] From 1965 until his death in 1972, he served as the director-general of the Prime Minister of Israel's office under the administrations of Levi Eshkol and Golda Meir.

Yehuda Avner called him "one of Israel's commanding intellects, possessed of a subtle and powerful mind, who was equally at home with Bach as he was with the Bible.