Mother See of Holy Etchmiadzin (Armenian: Մայր Աթոռ Սուրբ Էջմիածին) is the spiritual and administrative headquarters of the worldwide Armenian Apostolic Church and the Pontifical Residence of the Supreme Patriarch and Catholicos of All Armenians.

The Mother See of Holy Etchmiadzin is a blend of the past, present and future of the worldwide Armenian Church and contains the main church, monuments, museums and the pontifical residence. It was built in the days of Gregory the Illuminator and King Tiridates III in the place where, according to Armenian Church traditions, the Descent of Christ happened in Vagharshapat, Armenia, also known as Etchmiadzin. The wooden church was rebuilt in stone in the V and VII centuries. The bell tower was built in 1653 and the vestry in 1869. The complex includes the Etchmiadzin Cathedral, the vestry, Gevorkian Theological Seminary