The Neungseong Gu clan (Korean: 능성 구씨; Hanja: 綾城 具氏) is one of the Korean clans.

Their Bon-gwan is in Hwasun County, South Jeolla Province.

According to the research held in 2015, the number of Neungseong Gu clan's member was 174,161.

Their founder was Gu Jon-yu [ko] who exiled himself to Goryeo with Zhu Jam [ko], the great-grandchild of Zhu Xi, because in 1224 he feared for his physical safety when Song dynasty was on the verge of destruction by Mongolia.

[1][2] Gu Jon-yu was possibly of Chinese or Korean.