Stephen III may refer to: Pope Stephen II, aka Stephen III, (d. 757), pope of the Roman Catholic Church Pope Stephen III (720–772), native of Sicily Stephen III of Iberia, Guaramid dynasty, presiding prince of Iberia (Kartli, eastern Georgia) from 779/780 to 788 Stephen III of Naples (died 832), duke of Naples Stephen III of Hungary (1147–1172), King of Hungary and Croatia Stefan Dragutin of Serbia, Stephen III of Serbia (died in 1316) Stephen III, Duke of Bavaria (1337–1413) Stephen III Báthory (died 1444), Hungarian nobleman and commander, Palatine of Hungary Stephen III of Moldavia (c. 1433 – 1504), aka Stephen the Great, Prince of Moldavia eo:Stefano#Regantoj