Baron Joseph Günzburg (Baron Osip Gavrilovch Gintsburg, Барон Осип Гаврилович Гинцбург (or Iosif-Evzel, Иосиф-Евзель) , (1812, Vitebsk–January 12, 1878, Paris), was a Russian financier and philanthropist. He is the son of Gabriel Günzburg and the father of Horace Günzburg.
Having acquired great wealth during the Crimean war, Günzburg established a banking firm at St. Petersburg. There he began to labor on behalf of the welfare of the Jewish community. In November 1861, he was appointed by the Russian government member of the rabbinical commission, the meetings of which lasted five months. He exerted himself to raise the standard of the education of the Jews, and to this effect he founded in 1863 with the permission of the Russian government the Society for the Promotion of Culture Among the Jews, of which he filled the office of president till his death. Owing to Günzburg's efforts, the regulations concerning the military service of the Jews were in 1874 made identical with those of the peoples of other creeds. He also instituted a fund for the Talmud Torah of Vilna, his father's native town. The Günzburgs were ennobled by the Grand Duke of Hesse-Darmstadt on November 9, 1870, and Joseph received the title of baron on August 2, 1874.