2018 FINA World Swimming Championships (25 m) – Women's 100 metre backstroke
The women's 100 metre backstroke competition of the 2018 FINA World Swimming Championships was held on 11 and 12 December 2018.
Records
Prior to the competition, the existing world and championship records were as follows.| Name | Nation | Time | Location | Date | |
| World record Championship record | Katinka Hosszú | 55.03 | Doha | 4 December 2014 |
Results
Heats
The heats were started on 11 December at 11:49.| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 5 | Olivia Smoliga | 55.47 | Q, AM | |
| 2 | 6 | 4 | Emily Seebohm | 57.08 | Q | |
| 3 | 4 | 4 | Katinka Hosszú | 57.09 | Q | |
| 4 | 4 | 3 | Simona Kubová | 57.13 | Q | |
| 5 | 5 | 4 | Kathleen Baker | 57.16 | Q | |
| 6 | 6 | 5 | Minna Atherton | 57.17 | Q | |
| 7 | 5 | 5 | Michelle Coleman | 57.21 | Q | |
| 8 | 6 | 3 | Georgia Davies | 57.24 | Q | |
| 9 | 5 | 6 | Sayaka Akase | 57.36 | Q | |
| 10 | 5 | 3 | Emi Moronuki | 57.42 | Q | |
| 11 | 6 | 6 | Fu Yuanhui | 57.66 | Q | |
| 12 | 4 | 2 | Alicja Tchórz | 57.78 | Q | |
| 13 | 4 | 6 | Anastasia Fesikova | 57.85 | Q | |
| 14 | 5 | 2 | Mimosa Jallow | 57.93 | Q | |
| 15 | 4 | 0 | Margherita Panziera | 58.14 | Q | |
| 16 | 4 | 7 | Mathilde Cini | 58.16 | Q | |
| 17 | 6 | 2 | Daria Ustinova | 58.21 | ||
| 18 | 5 | 9 | Laura Riedemann | 58.27 | ||
| 19 | 5 | 1 | Anastasiya Shkurdai | 58.44 | ||
| 20 | 4 | 8 | Andrea Berrino | 58.58 | ||
| 21 | 6 | 7 | Etiene Medeiros | 58.62 | ||
| 22 | 5 | 7 | Hanna Rosvall | 58.80 | ||
| 23 | 3 | 5 | Isabella Arcila | 58.83 | ||
| 24 | 4 | 1 | Caroline Pilhatsch | 58.91 | ||
| 25 | 6 | 9 | Jenny Mensing | 59.08 | ||
| 26 | 3 | 1 | Karolína Hájková | 59.25 | ||
| 27 | 6 | 0 | Ekaterina Avramova | 59.26 | ||
| 28 | 3 | 6 | Ingrid Wilm | 59.31 | ||
| 29 | 6 | 1 | Chen Jie | 59.36 | ||
| 30 | 5 | 8 | Stephanie Au | 59.38 | ||
| 31 | 5 | 0 | Carlotta Zofkova | 59.57 | ||
| 32 | 3 | 3 | Krystal Lara | NR | ||
| 33 | 3 | 4 | Gabriela Georgieva | |||
| 34 | 3 | 2 | África Zamorano | |||
| 35 | 3 | 8 | Lushavel Stickland | NR | ||
| 36 | 1 | 5 | Felicity Passon | NR | ||
| 37 | 6 | 8 | Paige Flynn | |||
| 38 | 4 | 9 | Signhild Joensen | |||
| 39 | 2 | 4 | Celina Márquez | NR | ||
| 40 | 3 | 7 | Tatiana Salcuțan | |||
| 41 | 2 | 3 | Andrea Becali | |||
| 42 | 3 | 9 | Mónica Ramírez | |||
| 43 | 3 | 0 | Trinidad Ardiles | NR | ||
| 44 | 1 | 6 | Camille Koenig | |||
| 45 | 2 | 6 | Nimia Murua | |||
| 46 | 1 | 3 | Ri Hye-gyong | |||
| 47 | 2 | 2 | Danielle Treasure | |||
| 48 | 2 | 8 | Colleen Furgeson | |||
| 49 | 2 | 1 | Kimberly Ince | |||
| 50 | 2 | 5 | Yolani Blake | |||
| 51 | 2 | 7 | Eda Zeqiri | |||
| 52 | 1 | 4 | Britheny Joassaint | |||
| 53 | 2 | 0 | Osisang Chilton | |||
| 54 | 2 | 9 | Ada Thioune | |||
| 55 | 1 | 7 | Amanda Poppe | |||
| 1 | 1 | Hamna Ahmed | ||||
| 1 | 2 | Naima Akter |
Semifinals
The semifinals were started on 11 December at 20:14.Semifinal 1
Semifinal 2
Final
The final was held on 12 December at 20:31.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Olivia Smoliga | 56.19 | |||
| 3 | Katinka Hosszú | 56.26 | |||
| 6 | Georgia Davies | 56.74 | |||
| 7 | Minna Atherton | 56.74 | |||
| 5 | 5 | Kathleen Baker | 56.89 | ||
| 6 | 2 | Emily Seebohm | 56.98 | ||
| 7 | 1 | Simona Kubová | 57.03 | ||
| 8 | 8 | Emi Moronuki | 57.18 |