Ladislaus I (also spelled Vladislav I or Władysław I) may refer to:
Ladislaus I of Hungary (1040–1095), King of Hungary Ladislaus I Herman (1040–1102), Duke of Poland Vladislaus I, Duke of Bohemia (–1125), Duke of Bohemia Władysław II the Exile (1105–1159), Duke of Silesia, sometimes known as Ladislaus I the Exile Vladislaus II, Duke of Bohemia (–1174), who reigned as King Vladislaus I of Bohemia Vladislav I of Serbia, King of Serbia (1234–1243) Ladislaus I of Opole (1246–1281), Duke of Opole Wladislaus I of Oswiecim ( – ), Duke of Oświęcim Władysław I the Elbow-high (1261–1333), King of Poland (also known as Ladislaus the Short, or Władysław I Łokietek) Vladislav I of Wallachia (died 1377), Prince of Wallachia (also known as Vlaicu-Vodă) Ladislaus I Losonci (died 1392), Hungarian baron Ladislaus I of Naples (1377–1411), King of Naples
See also Ladislaus (disambiguation) Ladislaus I of Poland (disambiguation)