The men's 200 metre breaststroke event at the 2020 Summer Olympics was held from 27 to 29 July 2021 at the Tokyo Aquatics Centre.

Almost a body length behind Dutch early leader Arno Kamminga through the first 100 m of the race, Stubblety-Cook moved through the field in the penultimate lap.

ROC's world record holder and defending bronze medallist Anton Chupkov (2:07.24) missed the podium by 11 one-hundredths to place fourth.

Up to two swimmers per National Olympic Committee (NOC) can automatically qualify by swimming that time at an approved qualification event.

Up to one swimmer per NOC meeting that time is eligible for selection, allocated by world ranking until the maximum quota for all swimming events is reached.