Aonghus Ó Dálaigh (fl. c. 1200) was an Irish poet. Aonghus was a grandson of Cú Connacht Ua Dálaigh (died 1139) and said to be the common ancestor of all the O'Dalys extant. He is recorded as having six sons: * 1 - - ancestor of , poet to Ó Caoimh of Duhallow, County Cork * 2 - Donnchadh Mór Ó Dálaigh - ancestor to Ó Dálaigh of County Clare and County Galway * 3 - * 4 - Muireadhach Albanach - crusader poet of Lissadill, County Sligo * 5 - * 6 - - ancestor of Ó Dálaigh of Breifne and Connacht No obit of Aonghus is known to exist in any of the Irish annals.