| Moritz Duschak | |
| Birth Date: | 14 November 1815 |
| Birth Place: | Triesch, Moravia, Austrian Empire |
| Death Place: | Vienna, Austria-Hungary |
| Language: | German |
| Alma Mater: | University of Prague |
Moritz Mordechai Duschak (; 14 November 1815 – 21 July 1890) was an Austrian rabbi and author.
Moritz Duschak was born in Triesch, Moravia, on 14 November 1815. At the age of thirteen he went to Trebitsch, where he studied under Joachim Pollak. He was later a pupil in Talmud of Moses Sofer of Presburg, and studied at the University of Prague.
Duschak was for a long time rabbi in the Moravian towns of Aussee and Gaya. In 1877 he became preacher in Cracow and teacher of religion at the gymnasium of that city. After several years' service he left Cracow and settled in Vienna, where he spent his last days in neglect.