Swimming at the 2020 Summer Olympics

The swimming competitions at the 2020 Summer Olympics in Tokyo were due to take place from 25 July to 6 August 2020 at the Olympic Aquatics Centre. The women's 10 km open-water marathon was due to be held on August 5, with the men's race due to happen 2 days later (August 7) at the Odaiba Marine Park. Due to the COVID-19 pandemic, the games have been postponed to 2021. However, their official name remains 2020 Summer Olympics with swimming events set for 24 July–1 August 2021 and marathon swimming set for 4–5 August 2021.

Swimming will feature a record total of 37 events (18 for each gender and 1 mixed), with the addition of the men's 800 m freestyle, women's 1500 m freestyle, and the mixed 4 × 100 m medley relay.

Men's events

 * 1 Swimmers who participated in the heats only and received medals.