The Delbhna were a race of Ireland. They had a number of branches in central and western Ireland.

The Delbhna Tir Dha Locha were the most westerly branch, based in Iar Connacht.

The Delbhna Nuadat were lords of a large section of what is now County Roscommon, situated between the Suck and Shannon rivers. From the early historic era they were a subject people of the Ui Maine .

The Delbhna Bethra were located on the east bank of the river Shannon, in what is now County Westmeath. They may have once formed a single kingdom with the Delbhna Nuada untill subjugated by the Ui Maine . By the late 5th century they had fallen under the control of the Ui Néill.

The Delbhna took their name from Delbáeth who is stated as being a legendary High King of Ireland but was more likely a god of the Tuatha Dé Danann; he would have been their ancestor-deity in the same way that Woden was to the Anglo-Saxons.