City Readers Digital Historic Collections at the New York Society Library

Judasz Tadeusz Krusinski (born 1675 – died 1756) was a Polish Jesuit who lived in the Safavid Empire from 1707 to 1725/1728. He acted as an intermediary between the Papacy and the Iranian court, and also functioned as a court translator.

Proficient in Persian and well acquainted with the nation and its people, he was an inhabitant of the Safavid royal capital of Isfahan and a "first-hand witness" to the capture of the city by the rebellious Afghans in 1722. Krusinksi's accounts make him an important primary source on this particular period of the Safavid era.