Chung Yun-seong (Korean: 정윤성; born 27 March 1998) is a South Korean tennis player. Chung has a career high ATP singles ranking of 262 achieved on 17 December 2018. He also has a career high ATP doubles ranking of 412 achieved on 27 February 2017. Chung has won five ITF doubles titles. He and Orlando Luz lost to Yishai Oliel of Israel and Patrik Rikl of the Czech Republic in the final of the 2016 French Open boys' doubles, 6–3, 6–4.