Domhnall Óg Ó Néill

Domhnall Óg Ó Néill (died 1234) was king of Tír Eoghain and the son of Aodh Méith. When Aodh Méith died in 1230, Domhnall succeeded him despite opposition from the Meic Lochlainn, whose claimant Muirchertach mac Muirchertaig was backed by part of the Cenél nEógain.

After four years of rule he was killed in 1234 by Domhnall mac Muirchertaig Mac Lochlainn, who seized the throne. His sons Hugh Boy and Niall Cúlanch later fought each other for the kingship.