|Full name||Hong Un-jong|
|Country represented||North Korea|
|Born||9 March 1989|
Hamgyong, North Korea
|Height||1.55 m (5 ft 1 in)|
|Discipline||Women's artistic gymnastics|
|Club||Pyongyang Sports Club|
|Head coach(es)||Kim Chun-phil|
|Assistant coach(es)||Choe Kyong-hui|
|Revised Romanization||Hong Eunjeong|
Hong Un-jong (Korean: 홍은정; Hanja: 洪恩情; born 9 March 1989) is a North Korean artistic gymnast. She is the 2008 Olympic champion and 2014 World Champion on vault. She was the first North Korean female gymnast to win a medal at the Olympics.
Hong represented North Korea at the 2008 Summer Olympics in Beijing, where she won the gold medal in the women's vault competition. This was the first Olympic medal for a North Korean woman in Olympic gymnastics.
The following year she won the vault final at the World Championships. She performed the two most difficult vaults in the final. In 2015 Hong again represented North Korea at the World Championships held in Glasgow. Though she retained her full difficulties and performed impressively, she failed to defend her title and won a silver medal instead. She was behind Russia's Maria Paseka by 0.033 point. At the 2016 Summer Olympics, she qualified second into vault finals behind Simone Biles. In the finals she performed a solid Cheng to start. For her second vault, she became the first female gymnast to ever attempt a triple twisting yurchenko vault; however she under rotated and sat down the vault, getting the vault devalued to an Amanar, and ultimately missed the podium.
Hong Un-jong is the twin sister of Hong Su-jong, with whom she shares a 9 March birthday. Hong Su-jong had three different birth dates listed for her (1985, 1986, or 1989) at various competitions. At the 2004 Summer Olympics, she competed under the 1985 birth date, but the 1989 birth date would have meant that she was too young to compete. In November 2010 Hong Su-jong was banned from all competition out of North Korea for inconsistent age information for two years. North Korea was also banned from all international competition until October 2012 due to this incident, and North Korea could not send any gymnasts to the 2012 Summer Olympics.
|2005||East Asian Games||3rd|
|2008||Maribor World Cup||1st||4th|
|2010||Moscow World Cup||1st||6th|
|2011||North Korea banned from international competition|
|East Asian Games||3rd||1st||7th||6th|
|2014||Osijek World Cup||8th|
- "Hong Un-Jong". sports-reference. Archived from the original on 1 June 2015. Retrieved 12 September 2017.
- "North Korea Gymnastics". sports-reference. Archived from the original on 20 June 2015. Retrieved 20 June 2015.
- "Simone Biles denied third gold". ESPN. 11 October 2014. Retrieved 11 October 2014.
- Turner, Amanda (30 September 2010). "North Korean Gymnast's Age Under Dispute". International Gymnast Magazine. Retrieved 20 June 2015.
- "One Woman, Three Birthdays". The New York Times. The Associated Press. 2 October 2010. Retrieved 20 June 2015.
- "London 2012 Olympics: North Korean gymnasts suspended for age falsification". The Telegraph. 6 November 2010. Retrieved 20 June 2015.