The St. Gregory the Illuminator Cathedral[1] (Greek: Καθεδρικός Ναός του Αγίου Γρηγορίου του Φωτιστού) also called Armenian Church of St. Gregory the Illuminator is an Armenian Catholic cathedral located at 2 Rene Pio, Neos Kosmos[2] in Athens, Greece.

It functions as the seat of the Armenian Catholic Ordinariate of Greece a jurisdiction created for Catholics of the Armenian rite that was established in 1925 by Pope Pius XI and directly under the administration of the Holy See.

Father Hovsep Bezazian is the apostolic administrator.

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