Namesakes
Constantinus Heraclius
(a.k.a. Konstantinos) (m) 626-641 
Roman and Byzantine Emperors 641
Constantinus
(a.k.a. Konstantinos) (m) 652-685
Roman and Byzantine Emperors 668-685
Constantinus
(a.k.a. Konstantinos) (m) 718-775
Roman and Byzantine Emperors 741-775
Constantinus
(a.k.a. Konstantinos) (m) 771-c. 797
Roman and Byzantine Emperors 780-797
Constantinus Porphyrogenitus
(a.k.a. Konstantinos) (m) 905-959
Roman and Byzantine Emperors 913-959
Constantinus
(a.k.a. Konstantinos) (m) 960-1028
Roman and Byzantine Emperors 1025-1028
Constantinus Monomachus
(a.k.a. Konstantinos) (m) c. 1000-1055
Roman and Byzantine Emperors 1042-1055
Constantinus Ducas
(a.k.a. Konstantinos) (m) 1006-1067
Roman and Byzantine Emperors 1059-1067
Constantinus Palaeologus Dragases
(a.k.a. Konstantinos) (m) 1404-1453
Roman and Byzantine Emperors 1449-1453
Costa-Gavras
(a.k.a. Konstantinos) (m) 1933-
Notable Filmmakers
Dinos Angelidis
(m) 1969-
Notable Athletes (basketball)
Heraclius Novus Constantinus
(a.k.a. Konstantinos) (m) 612-641
Roman and Byzantine Emperors 641
Heraclius Constantinus
(a.k.a. Konstantinos) (m) 630-668
Roman and Byzantine Emperors 641-668
Konstantinos I
(m) 1868-1923
Other Royalty 1913-1917; 1920-1922 Greece (king)
Konstantinos II
(m) 1940-2023
Olympic Medalists 1960 sailing - dragon (gold)
Other Royalty 1964-1973 Greece (king)
Konstantinos Demertzis
(m) 1876-1936
Greek Prime Ministers 1935-1936
Konstantinos Dovas
(m) 1898-1973
Greek Prime Ministers 1961
Konstantinos Georgakopoulos
(m) 1890-1973
Greek Prime Ministers 1958
Konstantinos Karamanlis
(m) 1907-1998
Greek Prime Ministers 1955-1958; 1958-1961; 1961-1963; 1974-1980
Other Leaders 1980-1985; 1990-1995 Greece (president)
Konstantinos Petrou Kavafis
(m) 1863-1933
Notable Writers
Konstantinos Kollias
(m) 1901-1998
Greek Prime Ministers 1967
Konstantinos Konstantopoulos
(m) 1832-1910
Greek Prime Ministers 1892
Konstantinos Mitsotakis
(m) 1918-2017
Greek Prime Ministers 1990-1993
Konstantinos Stephanopoulos
(m) 1926-2016
Other Leaders 1995-2005 Greece (president)
Konstantinos Tasoulas
(m) 1959-
Other Leaders 2025- Greece (president)
Konstantinos Tsaldaris
(m) 1884-1970
Greek Prime Ministers 1946-1947; 1947
Konstantinos Tsatsos
(m) 1899-1987
Other Leaders 1975-1980 Greece (president)
Konstantinos Tsiklitiras
(m) 1888-1913
Olympic Medalists 1908; 1912 high jump - standing; long jump - standing (silver/bronze/gold)
Kostas Karamanlis
(m) 1956-
Greek Prime Ministers 2004-2009
Kostas Katsouranis
(m) 1979-
Notable Athletes (soccer)
Kostas Kenteris
(m) 1973-
Olympic Medalists 2000 200 m (gold)
Kostas Manolas
(m) 1991-
Notable Athletes (soccer)
Kostas Mitroglou
(m) 1988-
Notable Athletes (soccer)
Kostas Simitis
(m) 1936-
Greek Prime Ministers 1996-2004