Murchad mac Máele Dúin (flourished 819–833) was a King of Ailech and head of the Cenél nEógain branch of the northern Uí Néill.
However the high kingship passed back to the Clann Cholmáin of the southern Ui Neill in the person of Conchobar mac Donnchada (died 833).
[3] In 822 Murchad made another bid for the high kingship and advanced with the men of the north to Ard Brecáin (County Meath).
The men of Brega led by Diarmait mac Néill (died 826) of the Uí Chernaig sept of Síl nÁedo Sláine then went over secretly to Murchad and submitted to him at Druim Fergusa.
[6] Murchad seems to have accepted his fate and he is last heard of cooperating with Niall in routing out the Vikings in Daire Calgaig (Derry) in 833.