There were 3 triathlon events at the 2018 South American Games in Cochabamba, Bolivia.

One each for men and women and a mixed relay event.

The events were held between May 29 and 30 at the Laguna La Angostura.

[1] This event was a qualification event for the 2019 Pan American Games in Lima, Peru, where the top mixed relay teams qualified.

[2]