Mór Ní Thuathail (anglicised as Mor O'Toole) (c. 1114–1191) was a Queen-consort of Leinster as the principal first wife of King Diarmait Mac Murchada. Under Brehon Law, Irish men were allowed more than one wife. King Dermot's second wife was . Mór was the mother of Aoife of Leinster, the wife of Richard de Clare, Earl of Pembroke, known to history as Strongbow.