Vuk (died after 1378) was the Ban of Bosnia from 1366 until 1367, a member of the Kotromanić dynasty that ruled the Banate of Bosnia since the turn of the 14th century. Vuk was the younger son of Vladislav Kotromanić and Jelena Šubić, who were married in 1337. His brother, Tvrtko I, became Ban of Bosnia following the death of their paternal uncle, Stephen II, in 1353. Their father acted as regent until his death in 1354, followed by their mother until Tvrtko reached the age of majority in 1357. Vuk accompanied Jelena when she traveled to Hungary in 1354 to request consent to Tvrtko's accession from their overlord, King Louis I of Hungary. In July 1357, Tvrtko and Vuk were confirmed as joint rulers of Bosnia and Usora by King Louis under two conditions: one of the brothers would be at Louis