Saul Lieberman (Hebrew: שאול ליברמן, May 28, 1898 - March 23, 1983), also known as Rabbi Shaul Lieberman or The Gra"sh (Gaon Rabbeinu Shaul), was a rabbi and a scholar of Talmud. He served as Professor of Talmud at the Jewish Theological Seminary for over 40 years, and was for many years, head of the Harry Fischel Institute in Israel and also president of the American Academy for Jewish Research.