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

[1] The race began with a false start, as a media boat blocked about a third of the field from entering the water.

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.

[3] The lead group remained together until the end of the third lap, when Alex Yee, Kristian Blummenfelt, and Hayden Wilde surged ahead.

[4] The event took place at the Odaiba Marine Park and was 51.5 kilometres (32.0 mi) long along a flat course.