Konstantinos or Constantinos (Κωνσταντίνος, Konstantínos) is a Greek male given name.

• Konstantinos (born 1972), occultist
• Konstantinos "Kosta" Barbarouses (born 1990), New Zealand footballer
• Konstantinos Chalkias (born 1974), Greek footballer
• Konstadinos Gatsioudis (born 1973), Greek athlete
• Konstantinos Gavras (born 1933), Greek-French filmmaker
• Konstantinos Kanaris (1790–1877), Greek admiral and statesman, former Prime Minister of Greece
• Konstantinos Karamanlis (1907–1998), former Prime Minister and President of Greece
• Konstantinos Kenteris (born 1973), Greek athlete (sprinter) and Olympic gold medalist
• Konstantinos Koukodimos (born 1969), former Greek athlete and politician
• Konstantinos Logothetopoulos (1878–1961), former Prime Minister of Greece
• Kostas Mitroglou (born 1988), Greek footballer
• Konstantinos Mitsotakis (1918–2017), former Prime Minister of Greece
• Konstantinos Paparrigopoulos (1815–1891), Greek historian
• Konstantinos Psachos (1869–1949), Greek scholar and musicologist
• Konstantinos Simitis (born 1936), former Prime Minister of Greece
• Konstantinos Stephanopoulos (1926–2016), former President of Greece
• Konstantinos Tsaldaris (1884–1970), Greek politician
• Konstantinos Tsatsos (1899–1987), former President of Greece
• Konstantinos Tsiklitiras (1888–1913), Greek athlete and Olympic gold medalist
• Konstadinos Zalagitis (born 1980), Greek athlete (triple jump)