Áed mac Dlúthaig (died 701) was a King of Fir Cúl in Brega of the Síl nDlúthaig sept of the Síl nÁedo Sláine of Brega.
He was the grandson of Ailill Cruitire mac Áedo Sláine (died 634), a king of Brega.
In 689 Áed killed Diarmait Dian mac Airmetaig Cáech, the King of Uisnech in Mide of the Clann Cholmáin.
[3] Then in 695 Áed and Congalach mac Conaing Cuirre (died 696) of the Uí Chonaing were responsible for the death of the high king Fínsnechta Fledach and his son Bresal of the southern Clan Fínsnechtai sept at Grellaigh Dollaith.
[5] Áed is listed as one of the guarantors of the Cáin Adomnáin ("Law of the Innocents") of Saint Adomnán arranged at the Synod of Birr in 697 where he is called King of Cúl.