Louis Ginzberg (Hebrew: לוי גינצבורג, Levy Gintzburg; Russian: Леви Гинцберг, Levy Ginzberg; November 28, 1873 – November 11, 1953) 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.

His religious Lithuanian-Jewish family's piety and erudition were renowned, seeing that they traced their lineage back to the Gaon of Vilna's brother.

Ginzberg was highly praised by his colleagues;[4] JTS leader Louis Finkelstein described him as a "living symbol of love for Torah".

On account of his impressive scholarship in Jewish studies, Ginzberg was one of 66 scholars honored with a doctorate by Harvard University in celebration of its tercentenary in 1936.

The sorting, distributing, selecting, harmonizing and completing can only be done by experienced hands.Ginzberg's initiative to base halakhic decisions on law committees and not laymen is the method the Conservative movement describes as its present one till today.

Accordingly, Torah-less Judaism ... would be an entirely new thing and not the continuation of something given ... Ginzberg sought to emulate the Vilna Gaon's intermingling of "academic knowledge" in Torah studies under the label "historical Judaism"; for example, in his book Students, Scholars and Saints, Ginzberg quotes the Vilna Gaon's instruction, "Do not regard the views of the Shulchan Aruch as binding if you think that they are not in agreement with those of the Talmud."

The clergy could easily monitor the nominal amount of sacramental wine that each worshipper drank, especially because it was usually drunk only in Church and only on Sundays (for the communion or Eucharist ceremony).

Shortly afterwards, on January 24, 1922, the Conservative movement publicized the 71-page response written by Ginzberg tackling the halakhic aspects of drinking grape juice instead of wine in light of the historical circumstances.

Even this authority would admit that it is better to pronounce the kiddush over new wine than to desecrate the Divine Name and to disgrace the Jewish people, and we well know the damage caused the Jewish people by the trafficking in sacramental wine.At the time of Ginzburg's responsum, the Orthodox rabbinate had exclusive authority to sanction sacramental wine for Jews, and the responsum was thought by the Orthodox community to be tainted by self-interest.

[9] Ginzberg also write Geonica (1909), an account of the Babylonian Geonim containing lengthy extracts from their responsa, as discovered in the form of fragments in the Cairo Genizah.