Patriarch Matthew I may refer to:
Pope Matthew I of Alexandria, Pope of Alexandria & Patriarch of the See of St. Mark in 1378–1408 Matthew I of Constantinople, Ecumenical Patriarch of Constantinople from 1397 to 1410, with a brief interruption in 1402–03 Patriarch Matthew of Alexandria, Greek Orthodox Patriarch of Alexandria in 1746–1766 Matthew I of Armenia (r. 1858–1865), Patriarch and Catholicos of All Armenians