Niall Glúndub mac Áedo (modern spelling: Niall Glúndubh mac Aodha) (died 14 September 919) was a 10th-century Irish king of the Cenél nEógain and High King of Ireland. While many Irish kin groups were members of the Uí Néill and traced their descent from Niall of the Nine Hostages (Niall Noígiallach), the O'Neill dynasty took its name from Niall Glúndub rather than the earlier Niall. His mother was Máel Muire, daughter of Kenneth MacAlpin, King of Scots.