| Sport: | triathlon |
| Size: | 150 |
| Boysevents: | 1 |
| Girlsevents: | 1 |
| Mixedevents: | 1 |
Triathlon has been included in the Summer Youth Olympics since their inauguration. Unlike the Summer Olympic competition, a mixed relay is competed, in which competitors are paired across national boundaries to create evenly matched multinational teams, as part of the Youth Olympic Games' spirit of cooperation.
| 2010 Singapore | |||
| 2014 Nanjing | |||
| 2018 Buenos Aires | |||
| 2010 Singapore | |||
| 2014 Nanjing | |||
| 2018 Buenos Aires | |||
| 2010 Singapore | |||
| 2014 Nanjing | |||
| 2018 Buenos Aires | Europe 1 | Oceania 1 | Europe 3 |
As of the 2018 Summer Youth Olympics.