Yun Kŭnsu (Korean: 윤근수; Hanja: 尹根壽, 1537–1619) was a Korean scholar-official of the Joseon period. His art names were Wŏlchŏng (월정; 月汀), Oeam (외암; 畏菴), and his courtesy name was Chago (자고; 子固).