John III

John III may refer to:

People

• 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
• Patriarch John III of Antioch (ruled in 846–873)
• 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, Lord 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

Biblical

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