Ducksun Yoon (尹德善, 1921–1996) was a South Korean medical doctor and educator. His pen name is Ilsong (一松). His life can be divided into three periods; the first period when he was a medical student (1921-1944); the second period when he was active both as doctor and educator (1945–1967); the last period in which he dedicated himself mainly to the management of medical and educational institutions (1968–1996).