Constantin Rusu (born May 17, 1994) is a Moldovan kickboxer, currently competing in the lightweight division of ONE Championship. He is the former KOK and FEA welterweight champion. A professional competitor since 2016, Rusu has also competed for Colosseum Tournament and Dynamite Fighting Show in Romania. As of 1 October 2022, he is ranked the #10 welterweight in the world by Beyond Kick.