Sung-il, also spelled Seong-il or Seoung-il, is a Korean given name.

People with this name include: Kim Sŏngil (1538–1593), Joseon Dynasty politician Shin Seong-il (born 1937 as Kang Shin-young), South Korean actor Kim Sung-il (general) (born 1948), South Korean pilot, former Air Force Chief of Staff Jung Sung-il (director) (born 1959), South Korean film critic, director and screenwriter Jung Sung-il (figure skater) (born 1969), South Korean figure skater Song Sung-il (1969–1995), South Korean Greco-Roman wrestler Kim Sung-il (footballer, born 1973), South Korean football player Kim Seoung-il (born 1990), South Korean short track speed skater Kang Song-il (born 1994), North Korean alpine skier Pak Song-il, North Korean diplomat Kim Song-il, North Korean politician

See also List of Korean given names Li Sung Il (), North Korean table tennis player

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