Naftali Zvi Yehuda Berlin (1816 in Mir, Russia – August 10, 1893 in Warsaw, Poland), also known as Reb Hirsch Leib Berlin, and commonly known by the acronym Netziv, was an Orthodox rabbi, dean of the Volozhin Yeshiva and author of several works of rabbinic literature in Lithuania.
Berlin was born in Mir, today in Belarus in 1816 into a family of Jewish scholars renowned for its Talmudic scholarship. His father Jacob, while not a rabbi, was a Talmudic scholar descendant of a German rabbinic family; his mother was directly descended from Rabbi Meir Eisenstadt. According to some sources, Berlin initially was a weak student. However, most scholars believe this to be false. Legend has it that he applied himself to his studies after overhearing his parents debating whether he should pursue a trade.
His first wife was the daughter of Rabbi Yitzchok of Volozhin, the son of Rabbi Chaim Volozhin. His second wife was his niece, a daughter of Rabbi Yechiel Michel Epstein, the author of the Aruch haShulchan. A son from his first marriage, Chaim Berlin, became the rabbi of Moscow, a daughter married Rabbi Refael Shapiro, and his son from his second marriage was Rabbi Meir Berlin (later Bar-Ilan).
Berlin led the yeshiva in Volozhin (in what is presently Belarus), then the largest institution of its kind, from 1854 to its closure in 1892. Despite the destruction (twice) of the town and the yeshiva building in large fires, its enrollment increased steadily under his leadership, and the yeshiva would produce a number of prominent rabbinic figures who led Eastern European Jewry until World War II. Amongst them was Rabbi Shimon Shkop.