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 (died 627), of the Guaramid Dynasty, presiding prince of Iberia from c. 590 to 627 Ecumenical Patriarch Stephen I of Constantinople (867–893), Patriarch of Constantinople Stephen I, Count of Troyes (died 1020), seventh Count of Meaux Stephen I of Hungary (967/969/975 – 1038), Grand Prince of the Hungarians and first King of Hungary Stephen I of Croatia (ruled 1030–1058) Stephan I, Count of Sponheim (d. ca. 1080) Stephen I, Count of Burgundy (1065–1102), Count Palatine of Burgundy, Count of Burgundy and Count of Mâcon and Vienne Stephen of England (c. 1096 – 1154) may be referred to as Stephen I Stephen I of Sancerre (1133–1190), Count of Sancerre and son of Count Theobald II of Champagne Stefan Nemanja (1109–1199), Medieval Serb nobleman, Grand Prince of the medieval Serb state of Rascia Stephen I, Duke of Bavaria (1271–1310), duke of Lower Bavaria as co-regent of his older brothers Otto III and Louis III Stephen I, Ban of Bosnia (1242–1314), Bosnian Ban Stephen I of Moldavia (r. 1394–1399) Stephen Báthory of Poland (1533–1586), Hungarian noble Prince of Transylvania, King consort of Poland and Grand Duke consort of Lithuania.
eo:Stefano#Regantoj