The Women's 100 metre backstroke competition of the 2021 FINA World Swimming Championships (25 m) was held on 16 and 17 December 2021.[1]
Prior to the competition, the existing world and championship records were as follows.
The heats were started on 16 December at 11:51.[2]
The semifinals were started on 16 December at 19:16.[3]
The final was held on 17 December at 19:35.[4]
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