Constantine, son of Cuilén (Mediaeval Gaelic: Causantín mac Cuiléin; Modern Gaelic: Còiseam mac Chailein), known in most modern regnal lists as Constantine III, (before 971–997) was king of Scots from 995 to 997. He was the son of Cuilén, King of Scotland (Cuilén mac Iduilb). John of Fordun calls him, in Latin, Constantinus Calvus, which translates to Constantine the Bald. Benjamin Hudson notes that insular authors from Ireland and Scotland typically identified rulers by sobriquets.