John XIII

John XIII may refer to:


 * Pope John XIII, (r. 965–972)
 * John XIII of Constantinople, Ecumenical Patriarch (r. 1315–1320)
 * John XIII bar Ma'dani, Syriac Orthodox Patriarch of Antioch (r. 1483–1493)
 * Pope John XIII of Alexandria, Coptic Orthodox Patriarch of Alexandria (r. 1483-1524)