Konstantinos or Constantinos is a Greek masculine given name, and may refer to:
- Konstantinos, occultist
- Konstantinos Chalkias, Greek footballer
- Konstadinos Gatsioudis, Greek athlete (javelin)
- Konstantinos Karamanlis, former Prime Minister of Greece
- Konstantinos Kenteris, Greek athlete (sprinter)
- Konstantinos Koukodimos, former Greek athlete and politician
- Konstantinos Logothetopoulos, former Prime Minister of Greece
- Konstantinos Mitroglou, Greek footballer
- Konstantinos Mitsotakis, former Prime Minister of Greece
- Konstantinos Simitis, former Prime Minister of Greece
- Konstantinos Stephanopoulos, former President of Greece
- Konstantinos Tsaldaris, Greek politician
- Konstantinos Tsatsos, former President of Greece
- Konstantinos Tsiklitiras, former Greek athlete and Olympic champion
- Konstadinos Zalagitis, Greek athlete (triple jump)
- Konstantinos Miaris, Greek graphic designer /artist