The Delbhna Nuadat (Modern Irish: Dealbhna Nuad; IPA:ˈdʲalˠəwnˠəˈn̪ˠuəd̪ˠ) were lords of a large section of what is now Athlone in County Roscommon, situated between the Suca and Shannon rivers.
A branch of the larger Delbhna population group, they were from the early historic era a subject people of the Ui Maine.
Finn mac Arbh, Lord of Delbhna, was killed "and the Dealbhna were slaughtered about him."
This battle appears to have been the culmination of a war between the Ui Maine and the Delbhna Nuadat for possession of Athlone.
In 759, Diumasach, Lord of Delbhna Nuadat, drowned in an incident called "The shipwreck of the Dealbhna Nuadhat on Loch Ribh."