Naoko Fujioka (藤岡奈穂子, Fujioka Naoko, born 18 August 1975) is a Japanese professional boxer. She is Japan's first ever five-division world champion, having held the WBA female flyweight title since 2018 and previously the WBC female minimumweight; WBO female junior-flyweight; WBA female super-flyweight; and WBO female bantamweight titles between 2012 and 2017. As of September 2020, she is ranked as the world's best active female flyweight by The Ring and BoxRec.