Konstantinos "Kostas" Sloukas (born January 15, 1990) is a Greek professional basketball player for Olympiacos of the Greek Basket League and the Euroleague. He is also a regular member of the senior National Team of Greece. He is a left-handed, 1.87m (6'2 3⁄4") tall point guard, who can also play at the shooting guard position.

Sloukas has played in six EuroLeague Finals (2012, 2013, 2015, 2016, 2017, and 2018), winning the title on three occasions (2012, 2013, and 2017). He was a member of the All-EuroLeague First Team in 2019.