2018 FINA World Swimming Championships (25 m) – Women's 100 metre breaststroke  The women's 100 metre breaststroke competition of the 2018 FINA World Swimming Championships (25 m) was held on 14 and 15 December 2018. Prior to the competition, the existing world and championship records were as follows. The heats were started on 14 December at 10:49. The semifinals were started on 14 December at 20:42. The final was held on 15 December at 20:37.