Udayadityavarman I was the king of Angkor who reigned from 1001 to 1002 AD.
Maternal nephew of his predecessor Jayavarman V (968 â 1001), he reigned only for a few months. His death triggered a nine-year civil war. His successor in Yaà Âodharapura is a prince of the royal family named Jayavirahvarman (1002 â 1010).