Constantine II
Constantine II may refer to:
- Constantine II (emperor), Roman Emperor 337–340
- Constantine III (usurper), known as Constantine II of Britain in British legend
- Patriarch Constantine II of Constantinople, Patriarch of Constantinople from 754 to 766
- Antipope Constantine II, antipope from 767 to 768
- Constantine II of Scotland, King of Scotland 900–942 or 943
- Constantine II, Prince of Armenia
- Constantine II of Cagliari
- Constantine II of Torres, called de Martis, was the giudice of Logudoro
- Constantine II the Woolmaker, Catholicos of the Armenian Apostolic Church
- Constantine II, [King of Armenia], first Latin King of Armenian Cilicia of the Lusignan dynasty
- Constantine II of Bulgaria, last emperor of Bulgaria 1396–1422.
- Eskender, Emperor of Ethiopia sometimes known as Constantine II
- Constantine II of Georgia
- Constantine II, Prince of Mukhrani, Georgian nobleman
- Constantine II of Kakheti, King of Kakheti 1722–1732
- Constantine II of Greece, Olympic champion and formerly King of the Hellenes March 6, 1964 – June 1, 1973