Yun Il-sun (; , October 5, 1896 - June 22, 1987) was a South Korean pathologist, anatomist and politician. He was Vice Chairman (1954-1956) and 6th Chairman (1956 to 1960) of the University of Seoul. He was the nephew of Korean resistance leader Yun Chi-ho and elder cousin of Yun Po-sun, the 4th President of South Korea. His pen name was Dongho.