John XI may refer to:
Pope John XI, ruled in 931–935 John XI Yeshu, Syriac Orthodox Patriarch of Antioch in 1208–1220 John XI of Constantinople, Ecumenical Patriarch in 1275–1282 Pope John XI of Alexandria, ruled in 1427–1452 John XI Helou, Maronite Patriarch of Antioch in 1809–1823
See also John 11, the eleventh chapter of the Gospel of John