The women's K-1 slalom canoeing event at the 2020 Summer Olympics took place on 25 and 27 July 2021 at the Kasai Canoe Slalom Course. 27 canoeists from 27 nations competed.
This was the ninth appearance of the event, having previously appeared in every Summer Olympics with slalom canoeing: 1972 and 1992 to 2016. Reigning Olympic champion Maialen Chourraut of Spain made her fourth Olympic appearance (she also took bronze in 2012), attempting to defend her title. Reigning World Champion Eva Terčelj of Slovenia also competed as a medal hopeful. She placed 13th in 2012.
