King Constantine
King Constantine may refer to:
- Constantine , a king of Dumnonia in sub-Roman Britain
- Constantine I of Georgia, King of Georgia from 1405 or 1407 until his death
- Constantine II of Georgia, of the Bagrationi dynasty, king of Georgia from 1478
- Constantine I of Greece, King of Greece from 1913 to 1917 and from 1920 to 1922
- Constantine II of Greece, King of Greece from 1964 until abolition of the monarchy of Greece in 1973
- Constantine mac Fergusa, a king of the Picts
- Constantine I of Scotland, a king of the Picts
- Constantine II of Scotland, an early King of Scotland
- Constantine III of Scotland, king of Scots from 995 to 997
- Constantine I, King of Armenia
- Constantine II, King of Armenia, also called Guy
- Constantine III, King of Armenia
- Constantine IV, King of Armenia