Constantine, son of Cuilén, known in most modern regnal lists as Constantine III, (before 971–997) is king of Scots from 995 to 997.

He is 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.

Noting for example the similarly named Eugenius Calvus (Owen the Bald), an 11th-century King of Strathclyde.