Triathlon at the 2020 Summer Olympics – Men's

The men's triathlon at the 2020 Summer Olympics took place at the Odaiba Marine Park in Tokyo on 26 July 2021.

The race began with a false start, as a media boat blocked about a third of the field from entering the water. After the restart, the field remained close together coming out of the water. In the cycling leg, a group of 10 broke away for the first few laps but the chasing pack eventually reeled them by the end of the fifth lap to form a lead group of 37 triathletes. On the last lap, Andrea Salvisberg broke away solo to lead by 16 seconds heading into the second transition, but he was caught by the rest of the field on the first lap of the running leg. The lead group remained together until the end of the third lap, when Alex Yee, Kristian Blummenfelt, and Hayden Wilde surged ahead. In the final mile, Blummenfelt accelerated away from the other two to take the gold medal. Yee finished 11 seconds later to take the silver, with Wilde completing the podium a further nine seconds back.

Course
The event took place at the Odaiba Marine Park and was 51.5 km long along a flat course. Competitors began with a 1.5 km swimming leg, consisting of a 950 m lap followed by a shorter 550 m lap. Then, they took on the 40 km cycling leg, made of eight laps of a 5 km course. Finally, competitors finished with four 2.5 km laps that made up the 10 km running leg.