Sung-hyun is a Korean unisex given name, predominantly masculine. Its meaning differs based on the hanja used to write each syllable of the name. There are 27 hanja with the reading "seong" and 35 hanja with the reading "hyun" on the South Korean government's official list of hanja which may be registered for use in given names.^[1] Sung-hyun was the fourth-most popular name for baby boys in South Korea in 1990.^[2]

People with this name include:

• Mowg (composer) (born Lee Sung-hyun, 1972), South Korean male composer
• Andrew Choi (Korean name Choi Sung-hyun, born 1980), South Korean male singer
• Yoon Sung-hyun (born 1982), South Korean male film director and screenwriter
• Eru (singer) (born Jo Sung-hyun, 1983), South Korean male singer
• Baek Sung-hyun (born 1989), South Korean male actor
• Kevin Woo (Korean name Woo Sung-hyun, born 1991), American male singer based in South Korea

• Choi Sung-hyun (born 1982), South Korean male football midfielder
• Park Sung-hyun (born 1983), South Korean female archer
• Kim Sung-hyun (baseball, born 1987) (born 1987), South Korean male baseball second baseman
• Ko Sung-hyun (born 1987), South Korean male badminton player
• Kim Seong-hyun (born 1989), South Korean male baseball pitcher
• Kyung Sung-hyun (born 1990), South Korean male alpine skier
• Shin Seong-hyun (born 1990), South Korean male baseball infielder
• Lee Sung-hyun (born 1991), South Korean male kickboxer
• Moon Sung-hyun (baseball) (born 1991), South Korean male baseball pitcher
• Kim Sung-hyun (born 1993), South Korean male football defender
• Park Sung-hyun (born 1993), South Korean female golfer

• Moon Sung-hyun (born 1952), South Korean male politician, founding member of the Democratic Labor Party
• JJonak (born Bang Seong-hyun, c. 2000), South Korean male Overwatch player
• Sunghyun Cho, South Korean electrical engineer
• Andrew Kim (Korean name Kim Sung-hyun), South Korean-born American intelligence officer

• List of Korean given names