The Women's keirin competition at the 2021 UCI Track Cycling World Championships was held on 24 October 2021.

[3] The first two riders from each heat qualified for the second round, all other riders moved to the repechages.

The first round repechage was started at 13:34.

[4] The first rider from each heat qualified for the second round.

[5] The first three riders in each heat qualified for the final, all other riders raced for places 7 to 12.