Yosef Dayan (Hebrew: יוסף דיין; born 1945) is a Mexican-Israeli Orthodox rabbi, author and right-wing Israeli monarchist and nationalist, who claims to be the most senior heir to the Davidic line.

He and his family paternally descend from Josiah al-Hasan ben Zakkai (d. 940),[1] the younger brother of the Exilarch David ben Zakkai (d. 940), whose genealogy is recounted in the rabbinic work Seder Olam Zutta which traces the line of the Exliarchs back to David.

[2] One of Hasan's descendants, Solomon ben Azariah the Nasi, settled in Aleppo where the family became dayanim (judges) of the city and thus assumed the surname Dayan.

In 2004, he became a member of the newly reconstituted Sanhedrin, a duplicate of the religious tribunal which convened during the time of the Second Temple.

[5][6] He is alleged to have participated in so-called "death curse" ceremonies or Pulsa diNura aimed at Yitzhak Rabin and Ariel Sharon, presumably requesting divine retribution after those former prime ministers advocated Israeli withdrawal from Palestinian areas considered by Zionists to be inalienable parts of the Promised Land.