Fíachna Lonn mac Cóelbad ("the fierce") (flourished 482) was a Dal nAraide king in modern County Antrim, Ulster.
In some annals he is mentioned as a participant in the Battle of Ochae (Faughan Hill, near Kells) in 482 which overthrew the high king Ailill Molt of Connacht.
[2] The Annals of Ulster call him the son of the King of Dal nAraide.
[3] While other later annals such as the Chronicum Scotorum call him King of Dal nAraide.
[4] The descendants of his brother Condlae were to provide the ruling line the Uí Chóelbad of Dal nAraide.