The Jeongju Ryu clan (Korean: 정주 류씨; Hanja: 貞州 柳氏) is one of the Korean clans. Their Bon-gwan is in Kaepung, Kaesong. It was founded by Ryu Cheon-gung (류천궁) who was a nobleman from Jeongju and served as one of the Three Major Grand Masters (태위 삼중대광, 太尉 三重大匡).