Naju O clan () was one of the Korean clans. Their Bon-gwan was in Naju, South Jeolla Province. According to the research in 2015, the number of Naju O clan was 18152. Their founder was . He served as government official during Goryeo period and was a descendant of O Cheom () who came over from China to Silla during Jijeung of SillaâÂÂs reign in Silla dynasty.