John XII

John XII may refer to:


 * Pope John XII, ruled 955–964
 * John XII bar Maʿdani, Syriac Orthodox Patriarch of Antioch 1252–1263
 * John XII of Constantinople, Ecumenical Patriarch 1294–1303
 * Pope John XII of Alexandria, ruled 1480–1483
 * John XII Peter El Hajj, Maronite Patriarch of Antioch 1890–1898