Judasz Tadeusz Krusinski^{[lower-alpha 1]} (correctly, Polish: Krusiński) (born 1675 – died 1756) was a Polish Jesuit who lived in the Safavid Iran 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.

Wikimedia Commons has media related to Judasz Tadeusz Krusinski.

• Ferrer, José Cutillas (2018). "SPAIN: RELATIONS WITH PERSIA IN THE 16TH AND 17TH CENTURIES". Encyclopaedia Iranica.
• Malecka, Anna (2015). "How Turks and Persians Drank Coffee: A Little-known Document of Social History by Father J. T. Krusiński". Turkish Historical Review. 6 (2): 175–193. doi:10.1163/18775462-00602006.
• Matthee, Rudi (2008). "Jesuits in Safavid Persia". In Yarshater, Ehsan (ed.). Encyclopædia Iranica, Volume XIV/6: Japan IV. Iranians in Japan–Jobbāʾi. London and New York: Routledge & Kegan Paul. pp. 634–638. ISBN 978-1-934283-07-3.
• Matthee, Rudi (2013). The History of the Late Revolutions in Persia: An Eyewitness Account of the Fall of the Safavid Dynasty, by Judas Thaddeus Krusinski. I.B.Tauris. pp. 1–904. ISBN 978-1780764689.

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