Cú Collchaille Ua Baígilláin (died 1119) was an Irish poet. Ua Baigheallain who held the post of Chief Ollam of Ireland and died in 1119 AD. His obit is given in the Annals of the Four Masters as follows- "M1119.10 Cucollchoille Ua Baigheallain, chief ollamh of Ireland in poetry, a man distinguished for charity, hospitality, and universal benevolence towards the needy and the mighty, was killed by the men of Lurg and Tuath-ratha (Barony of Lurg and Tooragh, County Fermanagh), with his wife and two very good sons, and also five-and-thirty other persons, consisting both of his family and guests, in one house, on the Saturday before Little Easter, being the festival of Becan, son of Cula."