Blathmac mac Máele Cobo (died 670)[1] was a Dál Fiatach ruler of the over-kingdom of Ulaid.
He was the son of Máel Cobo mac Fiachnai (died 647).
His father was slain or killed by Blathmac's cousin Congal Cennfota mac Dúnchada in 647.
[3] The Irish annals mention Blathmac's death as king prior to Congal's with that title so it can be assumed that Blathmac acquired the title despite Congal's killing of his father.
[4] Blathmac had seven sons including Bécc Bairrche mac Blathmaic, a king of Ulaid.