John III

John III may refer to:

People

 * John III (bishop of Jerusalem) in 516–524
 * Pope John III, Pope from 561 to his death in 574
 * John Scholasticus, Patriarch of Constantinople from 565 to his death in 577
 * John III Rizocopo, Exarch of Ravenna from 710 to 711
 * John III of the Sedre, Syriac Orthodox Patriarch of Antioch from 631 to his death in 648
 * John III of Naples, Duke from 928 to his death in 968
 * John III of Gaeta, Duke from 984 to his death in 1008
 * John III of Amalfi, Duke in 1073
 * John III Doukas Vatatzes (c. 1192 – 1254), Emperor of Nicaea
 * John III Comyn of Badenoch (died 1306)
 * John III, Duke of Brittany (1286–1341)
 * John III, Duke of Brabant (1300–1355)
 * John III Megas Komnenos (c. 1321 – 1362), Emperor of Trebizond
 * John III of Montferrat (c. 1362 – 1381)
 * John III, Burgrave of Nuremberg (c. 1369 – 1420)
 * John III, Count of Auvergne (1467–1501)
 * Ivan III of Russia (1440–1505), Grand Duke of Russia since 1462
 * John III of Navarre (1469–1516)
 * John III Crispo, Duke of the Archipelago (1480–1494)
 * John III, Duke of Cleves (1490–1539)
 * John III of Portugal (1502–1557), King of Portugal and of the Algarves
 * John III of Sweden (1537–1592)
 * John III Sobieski (1629–1696), King of Poland and Grand Duke of Lithuania
 * Yohannes III of Ethiopia (c. 1824 – c. 1873), Emperor several times between 1840 and 1851
 * Prince Jean, Duke of Guise, pretended to the title John III, King of the French, 1926–1940
 * Infante Juan, Count of Barcelona, pretended to the title Juan III, King of Spain, 1941–1977
 * John Ernest III, Duke of Saxe-Weimar (1664–1707)
 * John Frederick III, Duke of Saxony (1538–1565)
 * John William III, Duke of Saxe-Eisenach (1666–1729)

Biblical

 * John 3, the third chapter of the Gospel of John
 * Third Epistle of John or 3 John
 * Ioannes III (disambiguation)