Joshua Zeitlin (1742 in Shklov, Belarus – August 18, 1822, in Kherson, Novorossiya) was a Russian rabbinical scholar and philanthropist. He was a pupil of the Talmudist Rabbi Aryeh Leib ben Asher Gunzberg who was the author of Sha'agat Aryeh; and, being an expert in political economy, he maintained close relations with Prince Potemkin, the favorite of Catherine II. During the Turko-Russian war, Zeitlin furnished the Russian army with various supplies, and managed that business so cleverly that he was afterward appointed imperial court councilor.