The Ukrainian Catholic Eparchy of Santa María del Patrocinio en Buenos Aires (Latin: Eparchia Sanctae Mariae a Patrocinio Bonaënsis) is an eparchy (diocese, bishopric) of the Ukrainian Greek Catholic Church, which uses the Byzantine Rite in the Ukrainian language, for its faithful in major immigration country Argentina.

Its cathedral see is in the capital city of Buenos Aires, but must not be confused with the Roman Catholic (Latin rite) Metropolitan see of the ecclesiastical province of Buenos Aires in Argentina.

• February 19, 1959: Ordinariate for Eastern Catholics in Argentina Established
• February 9, 1968: Established as the Ukrainian Catholic Apostolic Exarchate of Argentina
• April 24, 1978: Promoted as Eparchy of Santa María del Patrocinio en Buenos Aires

Apostolic Exarchs of Argentina (Ukrainian Rite)

• Bishop Andrés Sapelak, S.D.B. (February 9, 1968 – April 24, 1978)

Bishops of Santa María del Patrocinio en Buenos Aires (Ukrainian Rite)

• Bishop Andrés Sapelak, S.D.B. (April 24, 1978 – December 12, 1997)
  • Bishop Miguel Mykycej, F.D.P. (Apostolic Administrator January 21, 1998 – April 24, 1999)
• Bishop Miguel Mykycej, F.D.P. (April 24, 1999 – April 10, 2010)
  • Apostolic Administrator of Santa María del Patrocinio en Buenos Aires (Ukrainian Rite)
  • Sviatoslav Shevchuk, (April 10, 2010 – March 25, 2011)
  • Apostolic Administrator sede vacante of Santa María del Patrocinio en Buenos Aires
  • Bishop Daniel Kozelinski Netto (June 22, 2011 – October 8, 2016)
• Bishop Daniel Kozelinski Netto (since October 8, 2016)

• GCatholic.org
• Catholic Hierarchy

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