There have been several rulers called Constantine II:
- Antipope Constantine II, antipope from 767 – 768
- Constantine II (317 – 340), Roman Emperor 337 – 340
- Constantine II of Scotland (874? – 952), King of Scotland 900 – 942 or 943
- Constantine II (?-1422), last emperor of Bulgaria 1396-1422. Antipope Constantine II (d 6 August 768 was an Antipope in 767 and 768. Flavius Claudius Constantinus, known in English as Constantine II, (316 – 340 was Roman Emperor from 337 to 340 Constantine son of Áed ( Mediaeval Gaelic: Constantín mac Áeda; Modern Gaelic: Còiseam mac Aoidh) known in most modern regnal lists Constantine II (Константин II Konstantin II) ruled as emperor ( Tsar) of Bulgaria in Vidin from 1397 to 1422
- Constantine II of Kakheti, King of Kakheti 1722-1732
- Constantine II of Greece (born 6/2/1940), Olympic champion (1960) and formerly King of the Hellenes March 6, 1964 – December 8, 1974
- Constantine II, Prince of Armenia (d. Constantine II (კონსტანტინე II also known as Mahmād Qulī Khān (მაჰმად ყული-ხანი (died December 28, 1732 Early life Constantine was born at Psychiko, near Athens, the nephew of King George II and the second child and only son of the King's brother and Constantine II (Կոստանդին Բ Western Armenian Transliteration: Gosdantin or Kostantine) was briefly prince of the Armenian Cilicia 1129)
- Eskender, Emperor of Ethiopia sometimes known as Constantine II
- The Roman usurper Constantine III, known as Constantine II of Britain in British legend
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