Louis Ginzberg was a Russian-born American rabbi and Talmudic scholar of Lithuanian-Jewish descent, contributing editor to numerous articles of The Jewish Encyclopedia (1906), and leading figure in the Conservative movement of Judaism during the early 20th century.

The Jewish Encyclopedia: A Descriptive Record of the History, Religion, Literature, and Customs of the Jewish People from the Earliest Times to the Present Day is an English-language encyclopedia containing over 15,000 articles on the history, culture, and state of Judaism up to the early 20th century. The encyclopedia's managing editor was Isidore Singer and the editorial board was chaired by Isaac K. Funk and Frank H. Vizetelly.