Naoko Kumagai (born 8 August 1971) is a Japanese female kickboxer and 3-time World Champion in three different weight classes.^[1] She also had two amateur boxing matches with Russian Elena Karpachova, and one pro boxing match.^[2]

Kumagai is known for her knockout punch and high KO percentage. Her kickboxing record is 31 wins (27 KO), 4 losses and 2 draws.

This section of a biography of a living person does not include any references or sources. (March 2023)

Pro debut loss to WKA world champion Ella Yee of the United Kingdom; Kumagai defeated German kickboxing champion, Regina Halmich, by first-round KO; A five-round decision victory over ISKA world kickboxing champion, Kim "Fireball" Messer of the USA;

A First round KO victory over Japan's Natsumi Nakazawa; two fights with Australian star, Amanda Buchanan; the first fight with Buchanan was a five-round decision loss to Buchanan for the WKA World Title and the rematch with Buchanan was a 4th-round KO victory for Kumagai over Buchanan as Kumagai regained her WKA world title from Buchanan.

Kumagai VS WKA World Champion, Lisa Howarth, 2 fights: The first fight with Lisa Howarth in Manchester, England, was ruled a no contest by the WKA.

The 2nd fight with Lisa Howarth in Tokyo was a first-round KO Kumagai victory for the WKA World flyweight Title;

Kumagai vs Kyoko Miyazake aka Kamikaze was a fourth round TKO victory for her world title defense.

Kickboxing decision win over MMA star, Yoko Takahashi.

Draw vs Australian star, Holly Ferneley, in a five-round Muay Thai fight.

Draw vs shootboxing champion, Terumi Fujiyama, in a shoot boxing fight. One exhibition fight against world champion, Sachiyo Shibata(no decision was rendered in this "exhibition fight")

• Double-K World Women's Lightweight Champion^[3]
• WKA World Flyweight and Bantamweight Title^[3]
• UKF World Super Bantamweight Title^[3][4]

She appeared in Jackass: The Movie segment "Ass Kicked by Girl" beating up Ryan Dunn in a kickboxing session.^[5]