Duke of Transylvania

This article is about the members of the Hungarian royal family bearing the title in the 13th or 14th century. For the rulers of the Principality of Transylvania in the 16th and 17th centuries, see Prince of Transylvania. For the royal governors of Transylvania in the Kingdom of Hungary between the 11th and 16th centuries, see Voivode of Transylvania.
Map of 13th-century Kingdom of Hungary
Kingdom of Hungary in the late 13th century

The Duke of Transylvania (Hungarian: erdélyi herceg; Latin: dux Transylvaniae) was a title of nobility four times granted to a son or a brother of the Hungarian monarch. The dukes of the first and second creations, Béla (1226–1235) and Stephen (1257–1258 or 1259, 1260–1270) of the Árpád dynasty were in fact viceroys with significant authority in Transylvania. The duke of the third creation, Louis, did not administer the province. The fourth duke, Stephen of the Anjou dynasty (1350–1351) did not play any significant role in politics.