Serhiy Saveliyovych Onopko (; born 26 October 1973) is a Ukrainian retired professional footballer who played as a midfielder.
During his career Onopko played for Shakhtar Donetsk, Mykolaiv, Vorskla Poltava, Inter Baku, Dnipro Cherkasy and Hirnyk Kryvyi Rih.
He is a younger brother of Viktor Onopko.
Shakhtar Donetsk