Corc mac Luigthig (born 340), also called Conall Corc, Corc of Cashel, and Corc mac Láire, is the hero of Irish language tales which form part of the origin legend of the Eóganachta, a group of kindreds which traced their descent from Conall Corc and took their name from his ancestor Éogan Mór. The early kindred they belonged to are known as the Deirgtine. He was probably a grandson of Ailill Flann Bec, and possible cousins were Dáire Cerbba and the famous Crimthann mac Fidaig. The latter is his opponent in a celebrated cycle of stories.