Tír Fhíacrach Múaidhe

Irish: Tír Fhíacrach Múaidhe, meaning "Country of the Uí Fhíacrach of the River Moy" is a territory in County Sligo in northwest Ireland. It is now represented by the barony of Tireragh.

The land of Fiachrae, son of Eochaid Mugmedon.

Ua Dubhda (O'Dowd) were kings of Tir Fhiacrach. In 982 Aedh ua Dubhda (Aedh grandson of Dubhda), King of Uí Fiachrach Muaidhe, died "an untroubled death". He was the first of his dynasty to use the surname O Dubhda.