Stephen I
Stephen I may refer to:
- Pope Stephen I, Bishop of Rome from 254 to 257
- Stephen I of Antioch, Patriarch of Antioch from 342 to 344
- Stephen I of Iberia, of the Guaramid Dynasty, presiding prince of Iberia from c. 590 to 627
- Ecumenical Patriarch Stephen I of Constantinople, Patriarch of Constantinople
- Stephen I, Count of Troyes, seventh Count of Meaux
- Stephen I of Hungary, Grand Prince of the Hungarians and first King of Hungary
- Stephen I of Croatia
- Stephan I, Count of Sponheim
- Stephen I, Count of Burgundy, Count Palatine of Burgundy, Count of Burgundy and Count of Mâcon and Vienne
- Stephen of England may be referred to as Stephen I
- Stephen I of Sancerre, Count of Sancerre and son of Count Theobald II of Champagne
- Stefan Nemanja, Medieval Serb nobleman, Grand Prince of the medieval Serb state of Rascia
- Stephen I, Duke of Bavaria, duke of Lower Bavaria as co-regent of his older brothers Otto III and Louis III
- Stephen I, Ban of Bosnia, Bosnian Ban
- Stephen I of Moldavia
- Stephen Báthory of Poland, Hungarian noble Prince of Transylvania, King consort of Poland and Grand Duke consort of Lithuania.