William mac Ulick Burke, 4th Clanricarde or Mac William Uachtar (Upper Mac William) (English: /klænˈrɪkɑːrd/; klan-RIK-ard; died 1430) was an Irish chieftain and noble. William succeeded his elder brother, Ulick an Fhiona Burke, as chieftain. He was later succeeded by his nephew, Ulick;s son, Ulick Ruadh Burke, 5th Clanricarde. William's era is one of the more obscure reigns of a Clanricarde. The Annals of the Four Masters have only two references to his term: Only in A New History of Ireland IX does it give his year of death as 1430. His successor, Ulick Ruadh Burke, would reign until 1485.