2019 ITU World Triathlon Series

The 2019 ITU World Triathlon Series was the 11th season of the World Triathlon Series, the top level international series for triathlon, since its establishment in 2009. The season consisted of eight pairs of triathlon races for both a men's and woman's competition, beginning on 8 March in Abu Dhabi, and concluding on 1 September with the grand final at Lausanne, Switzerland. The season also contained five mixed relays as part of the Mixed Relay Series which offers national teams qualifying points for the mixed team relay event at the 2020 Tokyo Olympics.

Mario Mola and Vicky Holland began the season as defending champions from the 2018 season. Mario Mola was hoping to defend his title and become the first triathlete to hold the title for four years in a row.