Gavriel Zev Margolis

Rabbi Gavriel ("Reb Velvel") Zev Margolies (1847 in Vilna – 1935 in New York City) was an Orthodox Rabbi in the United States known for being an uncompromising traditionalist. in 1866; his father in law was Nachum Kaplan.

Margolis was ordained by Rabbi Jacob Barit and Rabbi Naphtali Judah Berlin. He taught and preached in Grodno (where his father-in-law Rabbi Nachum Grodno lived), before being invited to Vilna to assist Rabbi Eizele Charif publish his commentary on the Jerusalem Talmud. He later served as the head of the rabbinical courts in Mogilev Province, and Jasionowka.

In 1907 Margolis immigrated to the United States, settling in Boston, where he served as chief rabbi of seven local congregations. Moses Z. Margolies had served in the position of Orthodox rabbi in Boston for the previous seven years.

In 1910 he helped form a kosher supervising agency in Rochester, New York.

Joshua Hoffman wrote a thesis entitled: "The American Rabbinic Career of Rabbi Gavriel Zev Margolis".