Colmán mac Cobthaig (died 622) was a king of Connacht from the Ui Fiachrach branch of the Connachta. He was the first king of Connacht from the Ui Fiachrach Aidhne branch. This branch was descended from Eochu, the brother of Ailill Molt (died 484). According to the Book of Ballymote he was the grandson of Goibnenn mac Conaill (flor.537), the first Aidne king mentioned in the annals, but Rawlinson Genealogies name his grandfather as Gabrán.