In July 2021, Peaty became the first British swimmer to defend an Olympic title. He won Britain's first gold medal at the 2020 Tokyo Olympic Games (held in 2021), beating Arno Kamminga of the Netherlands in the 100m breaststroke with a time of 57.37 seconds. He won a second gold in the mixed 4 × 100 metre medley relay, setting a world record time of 3 minutes 37.58 seconds together with Kathleen Dawson, James Guy and Anna Hopkin.