The Armenian Apostolic Church (Armenian: Հայաստանեայց Առաքելական Եկեղեցի, Hayasdaniats Arakelagan Yegeghetzi) is the world's oldest national church and one of the most ancient Christian communities.

The official name of the church is the Armenian Orthodox and Apostolic Church. It is sometimes referred to as the Armenian Orthodox Church or the Gregorian Church, however the latter name is not preferred by the church, as it views the Apostles Bartholomew and Thaddeus as the founders, and St. Gregory the Illuminator as merely the first official head of the church.