Louis Rabinowitz (Hebrew: לואיס רבינוביץ, born 1906, died 1984) was an Orthodox rabbi, historian and philologist of the 20th century.
Rabbi Rabinowitz was born in Edinburgh, Scotland, descendant of a long lineage of Lithuanian Rabbis. His lineage to Rabbi Meir Katzenellenbogen, the Maharam of Padua and a descendent of the House of David, is detailed in The Unbroken Chain. His grandfather was Rabbi Eliezer Simcha Rabinowitz of Lomza, and his father Rabbi Jacob Rabinowitz immigrated from Eastern Europe to become the Rabbi of Edinburgh at the end of the nineteenth century. Jacob Rabinowitz later moved to London where he became the Rabbi of the Montagu Road Beth Hamedrash in Hackney.
Louis Rabinowitz served as rabbi in several London synagogues, including those in Shepherd's Bush, South Hackney, and Cricklewood. During World War II he was appointed Senior Jewish chaplain of the British Army; he served with Allied forces in the Middle East and during the Normandy invasion.
In 1945 Rabinowitz accepted a position as chief rabbi of the United Hebrew Congregation of Johannesburg and the Federation of Synagogues of Transvaal and the Orange Free State in South Africa. He became a professor of Hebrew at the University of Witwatersrand and headed the Johannesburg beth din. Rabbi Rabinowitz was an ardent follower of Zeev Jabotinsky and his brand of Revisionist Zionism.