Greek Catholic Apostolic Exarchate of Istanbul

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The Greek Catholic Apostolic Exarchate of Constantinople (Exarchatus Apostolicus Constantinopolitanus) is an Apostolic Exarchate (a missionary pre-diocesan structure) of the Greek Byzantine Catholic Church which is an Eastern Catholic Church. As a sui iuris (autonomous) Church, it is in full communion with the Holy See. In its liturgical services it uses the Byzantine Rite in the Greek language. It is effectively defunct.

The exarchate is exempt, which means that it is directly subject to the Holy See, as the Greek Catholic Church does not have a metropolitan bishop. Its geographic remit includes the entire territory of Turkey. Its cathedral church is the Cathedral of the Holy Trinity which is situated in Istanbul. As of 2017, it was the sole parish of the exarchate and had 16 parishioners. The last resident Greek-Catholic priest in Constantinople died in 1997 and has not been replaced. The only regular services in the Church of the Holy Trinity are held by exiled Chaldean of the Chaldean Catholic Archeparchy of Amida living in the city.^[1]