The following were the results of the finals only of each of the Women's 50 metre backstroke events in each of the classifications. Further details of each event, including where appropriate heats and semi finals results, are available on that event's dedicated page.
The S3 category is for swimmers who have leg or arm amputations, have severe coordination problems in their limbs, or have to swim with their arms but don't use their trunk or legs.
The final in this classification took place on 29 August 2021:
The S4 category is for swimmers who have function in their hands and arms but can't use their trunk or legs to swim, or they have three amputated limbs.
The final in this classification took place on 3 September 2021: