Áed Uaridnach (or Áed mac Domnaill) (died 612) was an Irish king who was High King of Ireland. He is sometimes also known as Áed Allán, a name most commonly used for the 8th-century king of the same name, this Áed's great-great-grandson.
Áed was the son of Domnall Ilchelgach (died 566) and brother of Eochaid mac Domnaill (died 572), considered to have been High Kings by some sources.. He belonged to the northern Cenél nEógain kindred of the Uí Néill. He was King of Ailech from 604 to 612
Áed, it was said, was preceded as High King by the joint rule of Áed Sláine and Colmán Rímid and ruled from 604 to 612. Áed is mentioned in the earliest Irish King list contained in the Baile Chuind (The Ecstasy of Conn), a late 7th-century Irish poem. In 605 Áed won a victory over the King of Leinster, Brandub mac Echach (died 605) at the Battle of Slabra. Leinster was often a target of the Ui Neill for inaugural raids and the levy of a cattle-tribute. The Annals of Tigernach place the beginning of his reign after this event. 
The cause of Áed's death is unknown, but his obituary presents it as a non-violent death. The Cenél Feradach, led by the descendants of Suibne Menn, overshadowed Áed's branch of the Cenél nEógain—the Cenél maic Ercae—and it was not until the time of his great-grandson Fergal mac Máele Dúin that the Cenél maic Ercae again provided a High King of Ireland. Áed's son Máel Fithrich mac Áedo (died 630) was a king of Ailech.
- Lacey, Cenél Conaill, p. 286.
- T.M. Charles-Edwards, Early Christian Ireland, Appendix V
- the Laud Synchronisms give him a reign of 8 years
- the Laud Synchronisms give him a reign of 7 years and the Book of Leinster 8 years
- Annals of Ulster AU 605.1; Annals of Tigernach AT 603.2
- Annals of Tigernach AT 603.6
- Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork
- Annals of Tigernach at CELT: Corpus of Electronic Texts at University College Cork
- Charles-Edwards, T. M. (2004), "Áed Uaridnach mac Domnaill (d. 612)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 2007-10-25
- Charles-Edwards, T. M. (2000), Early Christian Ireland, Cambridge: Cambridge University Press, ISBN 0-521-36395-0
- Byrne, Francis John (2001), Irish Kings and High-Kings (2nd ed.), Dublin: Four Courts Press, ISBN 1-85182-196-1
- Lacey, Brian (2006), Cenél Conaill and the Donegal Kingdoms AD 500–800, Dublin: Four Courts Press, ISBN 1-85182-978-4
- CELT: Corpus of Electronic Texts at University College Cork
- TLH: Thesaurus Linguae Hibernicae at University College Dublin