The Assyrian Church of the East (, ), officially the Holy Apostolic Catholic Assyrian Church of the East (; ), is an Eastern Christian church that follows the traditional christology and ecclesiology of the historical Church of the East. It belongs to the eastern branch of Syriac Christianity, and employs the Divine Liturgy of Saints Addai and Mari belonging to the East Syriac Rite. Its main spoken language is Syriac, a dialect of Eastern Aramaic, and the majority of its adherents are ethnic Assyrians.