2021 FINA World Swimming Championships (25 m) – Women's 100 metre breaststroke

The Women's 100 metre breaststroke at the 2021 FINA World Swimming Championships (25 m), held in Abu Dhabi, United Arab Emirates, was a swimming event where female swimmers competed in a 100-metre breaststroke race in a short course (25-metre) pool. This event was part of the overall program of the Championships, which featured numerous swimming disciplines and distances.

The competition consisted of preliminary heats, followed by a semi-final, and then a final. The swimmers with the fastest times from the heats advanced to the semi-finals, and the fastest swimmers from the semi-finals advanced to the final. The swimmer with the fastest time in the final was declared the winner and awarded the gold medal. Silver and bronze medals were awarded to the second and third-fastest swimmers, respectively.

The event showcased elite female breaststroke swimmers from around the world. Swimmers aimed to achieve personal bests, national records, and championship records during the competition. The results of the race contributed to the overall medal standings for participating nations. The event was governed by FINA (Fédération Internationale de Natation), the international governing body for aquatic sports.