Yehuda ben Meir (also known as Yehuda ha-Kohen or Judah of Mainz) was a German rabbi, Talmudic scholar and traveler of the late tenth and early eleventh century CE. His book Sefer ha-Dinim contains an account of his travels and those of other Jews in Eastern Europe. In this work, Przemyśl and Kiev are mentioned as trading sites along the Radhanite trade network.