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Hayyim Mordecai Margolioth (died 1818) (Hebrew: חיים מרדכי מרגליות) was a Polish rabbi, brother of Ephraim Solomon Margolioth. Ḥayyim Mordecai was at first rabbi at Brestitzki, and later became rabbi in Great Dubno, where he established a printing-office. He was among those who elected the three deputies sent to St. Petersburg to confer with the government upon Jewish affairs, and was the author of Sha'are Teshubah, a commentary to Shulḥan 'Aruk, Oraḥ Ḥayyim (Dubno, 1820); it contains extracts from other works and appears in most editions of the Shulḥan 'Aruk. He died at Dunajowce in 1818.
This article incorporates text from a publication now in the public domain: Singer, Isidore; et al., eds. (1901–1906). "Margolioth". The Jewish Encyclopedia. New York: Funk & Wagnalls.