| Event: | Women's 100 metre breaststroke |
| Competition: | 2018 FINA World Swimming Championships (25 m) |
| Venue: | Hangzhou Sports Park Stadium |
| Dates: | 14 December (heats and semifinals) 15 December (final) |
| Competitors: | 49 |
| Win Value: | 1.03.51 |
| Gold: | Alia Atkinson |
| Goldnoc: | JAM |
| Silver: | Katie Meili |
| Silvernoc: | USA |
| Bronze: | Jessica Hansen |
| Bronzenoc: | AUS |
| Prev: | 2016 |
| Next: | 2021 |
The women's 100 metre breaststroke competition of the 2018 FINA World Swimming Championships (25 m) was held on 14 and 15 December 2018.[1]
Prior to the competition, the existing world and championship records were as follows.
| Name | Nation | Time | Location | Date | ||
|---|---|---|---|---|---|---|
| World record | Rūta Meilutytė | 1:02.36 | Moscow | 12 October 2013 | ||
| Championship record | Alia Atkinson | 1:02.36 | Doha | 6 December 2014 |
The heats were started on 14 December at 10:49.[2]
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 1 | 6 | 1 | 1:03.76 | Q | |||
| 2 | 6 | 4 | 1:04.34 | Q | |||
| 3 | 6 | 2 | 1:05.06 | Q | |||
| 3 | 6 | 6 | 1:05.06 | Q | |||
| 5 | 4 | 2 | 1:05.24 | Q | |||
| 5 | 6 | 3 | 1:05.24 | Q | |||
| 7 | 4 | 3 | 1:05.33 | Q | |||
| 8 | 4 | 4 | 1:05.38 | Q | |||
| 9 | 5 | 7 | 1:05.55 | Q | |||
| 10 | 5 | 6 | 1:05.62 | Q | |||
| 11 | 5 | 5 | 1:05.70 | Q | |||
| 12 | 5 | 3 | 1:05.82 | Q | |||
| 13 | 6 | 5 | 1:05.85 | Q | |||
| 14 | 4 | 0 | 1:05.87 | Q | |||
| 15 | 5 | 4 | 1:06.29 | Q | |||
| 16 | 5 | 2 | 1:06.35 | Q | |||
| 17 | 4 | 9 | 1:06.42 | ||||
| 18 | 6 | 7 | 1:06.47 | ||||
| 19 | 4 | 6 | 1:06.55 | ||||
| 20 | 5 | 1 | 1:06.83 | ||||
| 21 | 4 | 8 | 1:06.90 | ||||
| 22 | 4 | 7 | 1:07.16 | ||||
| 23 | 5 | 0 | 1:07.19 | ||||
| 24 | 5 | 8 | 1:07.24 | ||||
| 25 | 3 | 4 | 1:07.39 | ||||
| 26 | 3 | 2 | 1:07.53 | ||||
| 27 | 6 | 0 | 1:07.55 | ||||
| 28 | 3 | 6 | 1:08.21 | ||||
| 29 | 6 | 9 | 1:08.27 | ||||
| 30 | 3 | 1 | 1:08.30 | ||||
| 31 | 3 | 3 | 1:08.52 | ||||
| 32 | 6 | 8 | 1:09.01 | ||||
| 33 | 5 | 9 | 1:09.13 | ||||
| 34 | 3 | 5 | 1:09.46 | ||||
| 35 | 3 | 0 | 1:09.47 | ||||
| 36 | 3 | 7 | 1:11.22 | ||||
| 37 | 2 | 4 | 1:12.57 | ||||
| 38 | 2 | 5 | 1:12.72 | ||||
| 39 | 3 | 9 | 1:13.12 | ||||
| 40 | 3 | 8 | 1:13.41 | ||||
| 41 | 2 | 8 | Jang Myong-gyong | 1:14.42 | |||
| 42 | 1 | 5 | 1:15.37 | ||||
| 43 | 2 | 3 | 1:16.44 | ||||
| 44 | 2 | 6 | 1:16.83 | ||||
| 45 | 1 | 4 | 1:17.08 | ||||
| 46 | 1 | 3 | 1:18.73 | ||||
| 47 | 2 | 2 | 1:21.48 | ||||
| 48 | 2 | 1 | 1:21.87 | ||||
| 49 | 2 | 7 | 1:31.73 | ||||
| 4 | 1 | ||||||
| 4 | 5 |
The semifinals were started on 14 December at 20:42.[3]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | 1:04.07 | Q | |||
| 2 | 5 | 1:04.82 | Q | |||
| 3 | 6 | 1:05.01 | Q | |||
| 4 | 2 | 1:05.09 | Q | |||
| 5 | 7 | 1:05.52 | ||||
| 6 | 3 | 1:05.80 | ||||
| 7 | 8 | 1:06.22 | ||||
| 8 | 1 | 1:06.49 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 6 | 1:04.11 | Q | |||
| 2 | 4 | 1:04.54 | Q | |||
| 3 | 3 | 1:04.73 | Q | |||
| 4 | 5 | 1:04.87 | Q | |||
| 5 | 2 | 1:05.14 | ||||
| 6 | 7 | 1:05.27 | ||||
| 7 | 1 | 1:05.54 | ||||
| 8 | 8 | 1:06.16 |
The final was held on 15 December at 20:37.[4]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 | 1:03.51 | |||||
| 3 | 1:03.63 | |||||
| 5 | 1:04.61 | |||||
| 4 | 7 | 1:04.73 | ||||
| 5 | 1 | 1:04.96 | ||||
| 6 | 6 | 1:05.10 | ||||
| 7 | 2 | 1:05.13 | ||||
| 8 | 8 | 1:05.34 |