Konstantina Vlachaki (Greek: ???sta?t??a ??a????; born May 8, 1995 in Chania, Greece) is a female professional volleyball player from Greece, who plays in Hellenic Vollley League for Thetis Voula.
From 2014 to 2019 as a member of
Hellenic powerhouse Olympiacos Piraeus she won 5 Hellenic Championships, 5 Hellenic Cups, and the CEV Women's Challenge Cup in 2018, being also runner-up of the CEV Women's Challenge Cup in 2017.