Jegal Sung-ryeol (Hangul/Hanja: 제갈성렬/諸葛成烈; Born: March 24th 1970 in Uijeongbu City, Gyeonggi Province) is a former speed skater from South Korea. Majority of Koreans bear with a single-syllable surname but in such case as Sung-ryeol; he holds two-syllable name: Jegal or Zhuge in Chinese. Sung-ryeol is a member of Namyang Jegal Clan (남양 제갈씨/南陽諸葛氏), originated at the Administrative Precinct of Namyang-dong, Hwaseong City, Gyeonggi Province.
Sung-ryeol is an alma mater of Uijeongbu High School and Dankook University. He began his speed skating career during 1992 Winter Olympics in Albertville, France where he finished 12th place in the 500m sprint. He collected three medals so far in his career: Gold (1996 Asian Winter Games in Harbin, China), Silver (1999 Asian Winter Games in Gangwon Province) and Bronze (1996 World Speed Skating Championships in Hamar, Norway).
In 2001, Sung-ryeol received the Order of Sport Merit, Geosang Medal (3rd Class) due to his distinguished achievements on speed skating for Korea. After his retirement from speed skating, he became assistant coach of South Korean Winter Olympic Squad along with head coach Lee Kyu-seok for 2002 Winter Olympics in Salt Lake City, USA and 2006 Winter Olympics in Turin, Italy.
In 2010, he became announcer for Seoul Broadcasting System (SBS) in the 2010 Winter Olympic Games at Vancouver, Canada.