Artgal mac Cathail (died 791)[1] was a King of Connacht from the Uí Briúin branch of the Connachta.
In 778, Artgal slaughtered the Ui Maine at the Battle of Mag Dairben.
In 780, the third enforcement of the law of Saint Commán of Roscommon and the abbot Áedán was imposed on the three Connachta.
[citation needed] Artgal abdicated in 782 and went on a pilgrimage to Iona the following year where he died in 791.
His son Cináed mac Artgail (died 792) was also a king of Connacht.