Kanstantsin is a given name. Notable people with the name include:
Kanstantsin Barycheuski (born 1990), Belarusian long jumper Kanstantsin Dzehtsiarou, scholar of human rights law in the University of Liverpool Kanstantsin Klimiankou (born 1989), Belarusian cyclist Kanstantsin Lepin (born 1988), Belarusian footballer Kanstantsin Lukashyk (born 1975), Belarusian pistol shooter Kanstantsin Shcharbak, Belarusian sprint canoeist Kanstantsin Siamionau (born 1978), Belarusian judoka Kanstantsin Sivtsov (born 1982), Belarusian road bicycle racer