Louis Finkelstein (June 14, 1895 in Cincinnati, Ohio – 29 November 1991) was a Talmud scholar, an expert in Jewish law, and a leader of the Jewish Theological Seminary of America (JTS) and Conservative Judaism. His major scholarly pursuits were works on the Pharisees (the second temple era sect from which rabbinic Judaism developed) and on the Sifra, the oldest rabbinic commentary on the book of Leviticus. Finkelstein authored a number of books, including Tradition in the Making, Beliefs and Practices of Judaism, Pre-Maccabean Documents in the Passover Haggadah, Introduction to the Treatises Abot and Abot of Rabbi Nathan (1950, in Hebrew with English summary), Abot of Rabbi Nathan, (a three volume series on The Pharisees), and Akiba: Scholar, Saint and Martyr. He also edited a four volume series entitled The Jews: Their History, Culture and Religion in 1949.