Patriarch John III

Patriarch John III may refer to:


 * Pope John II (III) of Alexandria (Patriarch John III of Alexandria), ruled in 505–516
 * Patriarch John III of Jerusalem, patriarch of Antioch from 846 to 873
 * Patriarch John III of Antioch (ruled in 797–810)
 * John III, Maronite Patriarch (designation contended among various people)