| Event: | Women's 100 metre backstroke |
| Competition: | 2018 FINA World Swimming Championships (25 m) |
| Venue: | Hangzhou Sports Park Stadium |
| Dates: | 11 December (heats and semifinals) 12 December (final) |
| Competitors: | 55 |
| Nations: | 47 |
| Win Value: | 56.19 |
| Gold: | Olivia Smoliga |
| Goldnoc: | USA |
| Silver: | Katinka Hosszú |
| Silvernoc: | HUN |
| Bronze: | Georgia Davies |
| Bronzenoc: | GBR |
| Bronze2: | Minna Atherton |
| Bronzenoc2: | AUS |
| Prev: | 2016 |
| Next: | 2021 |
The women's 100 metre backstroke competition of the 2018 FINA World Swimming Championships (25 m) was held on 11 and 12 December 2018.[1]
Prior to the competition, the existing world and championship records were as follows.
The heats were started on 11 December at 11:49.[2]
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|---|
| 1 | 4 | 5 | 55.47 | Q, AM | ||
| 2 | 6 | 4 | 57.08 | Q | ||
| 3 | 4 | 4 | 57.09 | Q | ||
| 4 | 4 | 3 | 57.13 | Q | ||
| 5 | 5 | 4 | 57.16 | Q | ||
| 6 | 6 | 5 | 57.17 | Q | ||
| 7 | 5 | 5 | 57.21 | Q | ||
| 8 | 6 | 3 | 57.24 | Q | ||
| 9 | 5 | 6 | 57.36 | Q | ||
| 10 | 5 | 3 | 57.42 | Q | ||
| 11 | 6 | 6 | 57.66 | Q | ||
| 12 | 4 | 2 | 57.78 | Q | ||
| 13 | 4 | 6 | 57.85 | Q | ||
| 14 | 5 | 2 | 57.93 | Q | ||
| 15 | 4 | 0 | 58.14 | Q | ||
| 16 | 4 | 7 | 58.16 | Q | ||
| 17 | 6 | 2 | 58.21 | |||
| 18 | 5 | 9 | 58.27 | |||
| 19 | 5 | 1 | 58.44 | |||
| 20 | 4 | 8 | 58.58 | |||
| 21 | 6 | 7 | 58.62 | |||
| 22 | 5 | 7 | 58.80 | |||
| 23 | 3 | 5 | 58.83 | |||
| 24 | 4 | 1 | 58.91 | |||
| 25 | 6 | 9 | 59.08 | |||
| 26 | 3 | 1 | 59.25 | |||
| 27 | 6 | 0 | 59.26 | |||
| 28 | 3 | 6 | 59.31 | |||
| 29 | 6 | 1 | 59.36 | |||
| 30 | 5 | 8 | 59.38 | |||
| 31 | 5 | 0 | 59.57 | |||
| 32 | 3 | 3 | NR | |||
| 33 | 3 | 4 | ||||
| 34 | 3 | 2 | ||||
| 35 | 3 | 8 | NR | |||
| 36 | 1 | 5 | NR | |||
| 37 | 6 | 8 | ||||
| 38 | 4 | 9 | ||||
| 39 | 2 | 4 | NR | |||
| 40 | 3 | 7 | ||||
| 41 | 2 | 3 | ||||
| 42 | 3 | 9 | ||||
| 43 | 3 | 0 | NR | |||
| 44 | 1 | 6 | ||||
| 45 | 2 | 6 | ||||
| 46 | 1 | 3 | ||||
| 47 | 2 | 2 | ||||
| 48 | 2 | 8 | ||||
| 49 | 2 | 1 | ||||
| 50 | 2 | 5 | ||||
| 51 | 2 | 7 | ||||
| 52 | 1 | 4 | ||||
| 53 | 2 | 0 | ||||
| 54 | 2 | 9 | ||||
| 55 | 1 | 7 | ||||
| 1 | 1 | |||||
| 1 | 2 |
The semifinals were started on 11 December at 20:14.[3]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 6 | 56.49 | Q | |||
| 2 | 4 | 56.84 | Q | |||
| 3 | 3 | 57.05 | Q | |||
| 4 | 5 | 57.18 | Q | |||
| 5 | 2 | 57.32 | Q | |||
| 6 | 8 | 57.70 | ||||
| 7 | 1 | 57.86 | ||||
| 8 | 7 | 58.40 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | 56.13 | Q | |||
| 2 | 3 | 56.27 | Q | |||
| 3 | 5 | 56.46 | Q | |||
| 4 | 2 | 57.48 | ||||
| 5 | 6 | 57.57 | ||||
| 6 | 7 | 57.83 | ||||
| 7 | 1 | 57.88 | ||||
| 8 | 8 | 58.31 |
The final was held on 12 December at 20:31.[4]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 | 56.19 | |||||
| 3 | 56.26 | |||||
| 6 | 56.74 | |||||
| 7 | 56.74 | |||||
| 5 | 5 | 56.89 | ||||
| 6 | 2 | 56.98 | ||||
| 7 | 1 | 57.03 | ||||
| 8 | 8 | 57.18 |