- Source: South Korea at the 2018 Summer Youth Olympics
- Olimpiade Musim Panas 2012
- Singapura
- Stadion Olimpiade
- South Korea at the 2018 Summer Youth Olympics
- 2018 Summer Youth Olympics
- 2024 Winter Youth Olympics
- South Korea at the 2010 Summer Youth Olympics
- South Africa at the 2018 Summer Youth Olympics
- 2026 Summer Youth Olympics
- North Korea at the 2018 Summer Youth Olympics
- Athletics at the 2018 Summer Youth Olympics
- South Korea at the 2014 Summer Youth Olympics
- Swimming at the 2018 Summer Youth Olympics
South Korea participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.
Medalists
Competitors
Archery
South Korea qualified two archers based on its performance at the 2017 World Archery Youth Championships.
Individual
Team
Athletics
Dancesport
South Korea qualified one dancer based on its performance at the 2018 World Youth Breaking Championship.
B-Girls - Yell
Fencing
South Korea qualified four athletes based on its performance at the 2018 Cadet World Championship, but only 3 participated.
Boys' Foil - Kwon Jungsung
Girls' Épée - Lim Taehee
Girls' Sabre - Lee Jueun
Gymnastics
= Artistic
=South Korea qualified two gymnasts based on its performance at the 2018 Asian Junior Championship.
Boys' artistic individual all-around - 1 quota
Girls' artistic individual all-around - 1 quota
= Rhythmic
=South Korea qualified one gymnast based on its performance at the 2018 Asian Junior Championship.
Girls' rhythmic individual all-around - 1 quota
Golf
Individual
Team
Judo
Team
Modern pentathlon
South Korea qualified two pentathletes based on its performance at the Asian/Oceanian Youth Olympic Games Qualifier. South Korea qualified a second male based on its performance at the 2018 Youth A World Championship. The nation must choose between the two boys.
Boys' Individual - Shin Hyoseop or Moon Juseong
Girls' Individual - Yoon Yangji
Eventually no South Korean modern pentathletes competed.
Roller speed skating
South Korea qualified two roller skaters based on its performance at the 2018 Roller Speed Skating World Championship.
Boys' combined speed event - Cheon Jongji
Girls' combined speed event - Lee Yerim
Shooting
South Korea qualified one sport shooter based on its performance at the 2017 Asian Championships.
Boys' 10m Air Pistol - 1 quota
Individual
Mixed
Sport climbing
South Korea qualified one sport climber based on its performance at the 2017 World Youth Sport Climbing Championships.
Boys' combined - 1 quota (Seongmin Eog)
Swimming
Table tennis
South Korea qualified one table tennis player based on its performance at the Asian Continental Qualifier. South Korea also qualified a female table tennis player based on its performance at the Road to Buenos Aires (Asia) series.
Boys' singles - Cho Daeseong
Girls' singles - Choi Haeeun
Taekwondo
Boys
Girls
Triathlon
South Korea qualified one athlete based on its performance at the 2018 Asian Youth Olympic Games Qualifier.
Individual
Relay