South Korea participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.
South Korea qualified two archers based on its performance at the 2017 World Archery Youth Championships.
South Korea qualified one dancer based on its performance at the 2018 World Youth Breaking Championship.
South Korea qualified four athletes based on its performance at the 2018 Cadet World Championship, but only 3 participated.
South Korea qualified two gymnasts based on its performance at the 2018 Asian Junior Championship.
South Korea qualified one gymnast based on its performance at the 2018 Asian Junior Championship.
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.
Eventually no South Korean modern pentathletes competed.
South Korea qualified two roller skaters based on its performance at the 2018 Roller Speed Skating World Championship.
South Korea qualified one sport shooter based on its performance at the 2017 Asian Championships.
South Korea qualified one sport climber based on its performance at the 2017 World Youth Sport Climbing Championships.
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.
South Korea qualified one athlete based on its performance at the 2018 Asian Youth Olympic Games Qualifier.