Yoon Yoo-sun (; born January 17, 1969) is a South Korean actress. She began her career as a child actress in 1975, and continued acting as an adult in film and television, including in The Story of Two Women (1994), Even If the Wind Blows (1995), ' (2011), and Another Promise (2014).
Her two nephews by marriage are the K-pop idols Lee Sung-yeol (member of K-pop boy group Infinite) and his younger brother Lee Dae-yeol (leader of K-pop boy group Golden Child), both sons of her brother-in-law (her husband's brother).