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.
* 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 of Trebizond (c. 1321–1362).
* John III of Montferrat (c. 1362–1381).
* John III, Burgrave of Nuremberg (c. 1369–1420).
* John III, Count of Auvergne (1467–1501).
* John III of Navarre (1469–1516).
* 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. 1797–?), Emperor several times between 1840 and 1851.

*Infante Juan, Count of Barcelona, who would have been King John III of Spain had he succeeded his father Alfonso XIII.

Biblical

*John 3, the third chapter of the Gospel of John
*Third Epistle of John or 3 John