Eleftherios "Lefteris" Mantzoukas (alternate spelling: Madzoukas) (Greek: Ελευθέριος "Λευτέρης" Μαντζούκας; born July 8, 2003) is a Greek professional basketball player for Panathinaikos of the Greek Basket League and the EuroLeague. He is 2.07 m (6'9 1⁄2") tall and he can play both as a small forward, as well as a stretch power forward.