The Armenian Patriarch of Constantinople, also known as Armenian Patriarch of Istanbul, is today head of the Armenian Patriarchate of Constantinople (Armenian: Պատրիարքութիւն Հայոց Կոստանդնուպոլսոյ), one of the smallest Patriarchates of the Oriental Orthodox Church but one that has exerted a very significant political role and today still exercises a spiritual authority.
The Armenian Patriarchate of Constantinople recognizes the primacy of the Catholicos of All Armenians, in the spiritual and administrative headquarters of the Armenian Church, the Etchmiadzin, Republic of Armenia, in matters that pertain to the worldwide Armenian Apostolic Church. In local matters, the Patriarchal See is autonomous.
The seat of the Armenian Patriarchate of Constantinople is the Surp Asdvadzadzin Patriarchal Church (Holy Mother of God Patriarchal Church) in the Kumkapı neighborhood of Istanbul.
The first Armenian Patriarch of Constantinople was Hovakim I, who was at the time the Metropolitan of Bursa. In 1461, he was brought to Constantinople by Sultan Mehmed II and established as the Armenian Patriarch of Constantinople. Hovakim I was recognized as the religious and secular leader of all Armenians in the Ottoman Empire, and carried the title of milletbaşı or ethnarch as well as patriarch.