The women's Keirin event at the 2020 Summer Olympics took place on 4 and 5 August 2021 at the Izu Velodrome.

[2] This will be the 3rd appearance of the event, which has been held at every Summer Olympics since its introduction in 2012.

Russia, Germany, China, Great Britain, Australia, and the Netherlands are traditionally strong track cycling nations.

[3] A National Olympic Committee (NOC) could enter up to 2 qualified cyclists in the women's Keirin.

[2] Because qualification was complete by the end of the 2020 UCI Track Cycling World Championships on 1 March 2020 (the last event that contributed to the 2018–20 rankings), qualification was unaffected by the COVID-19 pandemic.