Singapore participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.
Singapore qualified one athlete based on the Youth Olympic Games Asia Area Qualifiers.
Singapore qualified two players based on the Badminton Junior World Rankings.
Singapore qualified one gymnast based on its performance at the 2018 Asian Junior Championship.
Singapore qualified one boat based on its performance at the Asian Nacra 15 Qualifiers. Later, at the 2018 Singapore Open (Asian Techno 293+ Qualifiers) Singapore qualified two boats.
Singapore qualified one sport shooter based on its performance at the 2017 Asian Championships.
Singapore qualified one table tennis player based on its performance at the Road to Buenos Aires (Latin America) series. Singapore later qualified a male table tennis player based on its performance at the Road to Buenos Aires (Oceania) series.
Singapore qualified one athlete based on its performance at the 2018 Asian Youth Olympic Games Qualifier.