The women's 100 metre breaststroke competition of the 2020 European Aquatics Championships was held on 18 and 19 May 2021.

[1][2] Before the competition, the existing world, European and championship records were as follows.

[3] The swim-off was held on 18 May at 11:19.

[4] The semifinals were held on 18 May at 18:31.

[5] The final was held on 19 May at 18:25.