Nicholas of Ilok was a Hungarian nobleman, Ban of Croatia, Slavonia, Dalmatia and Macsó, Voivode of Transylvania and titular King of Bosnia from 1471 until his death.

The Újlaki family, in old sources de Illoch, de Wylak, de Voilack etc., Hungarian: Újlaki) was a Croatian–Hungarian noble family, descended in the male line from Gug, a member of the lower nobility in the region of Lower Slavonia during the 13th century.