Constantine (/ˈkɒnstəntaɪn/ or /ˈkɒnstəntiːn/; Latin: Cōnstantīnus, Greek: Κωνσταντῖνος, Kōnstantînos) is a masculine and feminine (in French for example) given name and surname which is derived from the Latin name Constantinus,[1] a hypocoristic of the first names Constans and Constantius, both meaning "constant, steadfast" in Latin.

[2] The popularity stems from the thirteen Roman and Byzantine emperors, beginning with Constantine the Great.

The name "Constantine" is a noble name in Greece and Cyprus, the forms Κώστας (Kostas), Κωστής (Kostis) and Ντίνος (Dinos) being popular hypocoristics.

The name is common among Eastern Orthodox people in Albania, in the form of Kostandin, Kostantin or Kosta.

The name is also found in other languages of Western Europe such as Considine in Irish, Constantijn in Dutch or Còiseam in Scottish Gaelic.