Juraj III Frankopan (English: George III Frankopan; ?–1553) was a Croatian nobleman, a member of the Slunj branch of the Frankopan noble family, very powerful and influential in the Croatian Kingdom. He was proprietor of many estates and castles, among which and Cetin Castle. He is best known for organizing and hosting the assembly of the Croatian Parliament in the Cetin Castle by the end of 1526, that followed a succession crisis in Croatia and Hungary caused by the death of King Louis II, which resulted in the election of Ferdinand I of Habsburg, the Archduke of Austria, as King of Croatia.