Domnall mac Áeda Muindeirg (died 804) was a chief of the Cenél Conaill of the northern Uí Néill in modern County Donegal and sometimes styled "King of the North".
Domnall succeeded his uncle Murchad mac Flaithbertaig as King of the Cenél Conaill upon his assassination in 767.
[3] In 787 Domnall was defeated in battle by Máel Dúin mac Áedo Alláin (died 788) of the Cenél nEógain and lost his supremacy in the north.
[4] Upon the death of Máel Dúin, Domnall made a bid to ragain his supremacy but was defeated in 789 at the Battle of Clóitech (now Clady on the River Finn) by Áed Oirdnide (died 819) of the Cenél nEógain.
Domnall was recognized as King of the North in his death notice in the annals in 804 but the circumstances of how he recovered the title are not known.