2021 World Triathlon Duathlon Championships

The 2021 World Triathlon Duathlon Championships was a duathlon competition held in Avilés, Spain from 6 to 7 November 2021 and organized by World Triathlon. The Elite and U23 races consisted of a 10.65 km run, 39.6 km bike and 5.2 km run. The championship also included other races per age group, junior, sprint per age group and para-duathlon.

Results
In the women's Elite race, Venezuelan Joselyn Brea, competing under World Triathlon flag, won her first world championship. French Nathan Guerbeur won his second consecutive title in the men's Elite edition.