Kleber Koike Erbst is a Japanese mixed martial artist who competes in the Featherweight division of Rizin Fighting Federation, where he is the former Rizin Featherweight Champion. He has also competed in Konfrontacja Sztuk Walki (KSW), where is the former KSW Featherweight Champion.

Konfrontacja Sztuk Walki better known by its initials KSW, is widely considered to be the premiere mixed martial arts organization in Poland and one of the leading in Europe.