Ioan Giurgiu Patachi (or Latin: Ioannes Nemes de Pataki, 1680–1727) was Bishop of Fogaras and Primate of the Romanian Greek Catholic Church from 1721 to his death in 1727.

Ioan Giurgiu Patachi was born from a family of small nobility in Horgospataka (today Strâmbu, part of Chiuiești, Romania), Kolozs County in 1680.

He studied in Kolozsvár (today Cluj-Napoca, Romania), Vienna and later he was sent to the German and Hungarian College of Rome where he remained from 1705 to 1710.

Moreover the Latin bishop of Gyulafehérvár opposed to presence of a Greek Catholic diocese in the same town, and the monastery in Gyulafehérvár, where the Greek Catholic Romanian Church was based, had to be demolished to give place to a fortress.

[2][3] He died a few years later, on 29 October 1727 in Alsószombatfalva, Brassó County (today Sâmbăta de Jos, part of Voila, Romania).