Louis Finkelstein was a Talmud scholar, an expert in Jewish law, and a leader of the Jewish Theological Seminary of America (JTS) and Conservative Judaism.

The Jewish Theological Seminary (JTS) is a Conservative Jewish education organization in New York City, New York. It is one of the academic and spiritual centers of Conservative Judaism and a center for academic scholarship in Jewish studies. The Jewish Theological Seminary Library is one of the most significant collections of Judaica in the world.