Isang Yun, also spelled Yun I-sang (17 September 1917 – 3 November 1995), was a Korean-born composer who made his later career in Germany.
Yun was born in Sancheong, Korea (in present-day South Korea) in 1917, the son of poet Yun Ki-hyon. He began writing music at the age of 14 and studying music formally two years later, in 1933. In the mid-1930s, he studied briefly at the Osaka College of Music, and from 1938 composition under Tomojiro Ikenouchi in Tokyo. After Japan entered World War II, he moved back to Korea and participated in the Korean independence movement. He was captured and imprisoned by the Japanese in 1943.
After the war, he did welfare work, establishing an orphanage for war orphans, and teaching music in Tongyeong and Busan. After the armistice ceasing hostilities in the Korean War in 1953, he began teaching at the Seoul National University. He received the Seoul City Culture Award in 1955, and traveled to Europe the following year to finish his musical studies.