# 2010 FINA World Swimming Championships (25 m) – Women's 400 metre freestyle

The Women's 400 Freestyle at the 10th FINA World Swimming Championships (25m) was swum on 17 December 2010 in Dubai, United Arab Emirates. 47 swimmers raced in the preliminary heats, with the top-8 advancing to a final that evening.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Joanne Jackson | United Kingdom | 3:54.92 | Leeds | 8 August 2009 |
| Championship record | Kylie Palmer | Australia | 3:59.23 | Manchester | 11 April 2008 |
The following records were established during the competition:
| Date | Round | Name | Nation | Time | WR | CR |
| 17 December 2010 | Final | Katie Hoff | United States | 3:57.07 | | CR |

## Results
### Heats

| Rank | Heat | Lane | Name | Time | Notes |
| 1 | 6 | 3 | Katie Hoff (USA) | 4:00.37 | Q |
| 2 | 6 | 4 | Coralie Balmy (FRA) | 4:00.73 | Q |
| 3 | 4 | 4 | Kylie Palmer (AUS) | 4:01.45 | Q |
| 4 | 5 | 6 | Federica Pellegrini (ITA) | 4:02.44 | Q |
| 5 | 5 | 5 | Chloe Sutton (USA) | 4:02.77 | Q |
| 6 | 4 | 6 | Patricia Castro (ESP) | 4:02.85 | Q |
| 7 | 6 | 6 | Erika Villaécija (ESP) | 4:04.88 | Q |
| 8 | 1 | 1 | Li Xuanxu (CHN) | 4:05.25 | Q |
| 9 | 6 | 2 | Elena Sokolova (RUS) | 4:05.69 | |
| 10 | 3 | 1 | Nina Rangelova (BUL) | 4:06.00 | |
| 11 | 6 | 5 | Ophélie Cyrielle Etienne (FRA) | 4:06.22 | |
| 12 | 5 | 4 | Lotte Friis (DEN) | 4:06.24 | |
| 13 | 4 | 2 | Kristel Kobrich (CHI) | 4:06.28 | |
| 14 | 5 | 2 | Veronika Popova (RUS) | 4:06.39 | |
| 15 | 3 | 5 | Hannah Miley (GBR) | 4:07.17 | |
| 16 | 5 | 3 | Katie Goldman (AUS) | 4:07.72 | |
| 17 | 6 | 8 | Leone Vorster (RSA) | 4:08.33 | |
| 18 | 6 | 7 | Nina Cesar (SLO) | 4:08.61 | |
| 19 | 4 | 7 | Cecilia Biagioli (ARG) | 4:09.29 | |
| 20 | 3 | 3 | Maiko Fujino (JPN) | 4:09.40 | |
| 21 | 4 | 1 | Barbora Závadová (CZE) | 4:09.46 | |
| 22 | 3 | 4 | Andreina Pinto (VEN) | 4:10.69 | |
| 23 | 6 | 1 | Tjasa Oder (SLO) | 4:11.39 | |
| 24 | 5 | 1 | Cecilie Waage Johannessen (NOR) | 4:12.07 | |
| 25 | 4 | 8 | Katarina Filova (SVK) | 4:14.69 | |
| 26 | 2 | 6 | Samantha Arévalo (ECU) | 4:15.47 | |
| 27 | 5 | 8 | Alexandra Gabor (CAN) | 4:15.67 | |
| 28 | 3 | 7 | Elin Sofia Slaatmo (NOR) | 4:15.86 | |
| 29 | 3 | 6 | Ting Sheng-Yo (TPE) | 4:16.22 | |
| 30 | 2 | 4 | Julia Hassler (LIE) | 4:16.28 | |
| 31 | 3 | 8 | Alexia Pamela Benitez Quijada (ESA) | 4:16.37 | |
| 32 | 2 | 5 | Andrea Cedrón (PER) | 4:17.27 | |
| 33 | 2 | 3 | Daniela Kaori Miyahara (PER) | 4:17.48 | |
| 34 | 3 | 1 | Simona Marinova (MKD) | 4:20.07 | |
| 35 | 2 | 7 | Malia Mghezzi Bekhouche (ALG) | 4:21.74 | |
| 36 | 2 | 2 | Victoria Isabelle Ho (JAM) | 4:27.08 | |
| 37 | 2 | 1 | Shannon Austin (SEY) | 4:33.84 | |
| 38 | 1 | 4 | Davina Mangion (MLT) | 4:39.21 | |
| 39 | 2 | 8 | Olivia Planteau de Maroussem (MRI) | 4:45.83 | |
| 40 | 1 | 6 | Estellah Fils Rabetsara (MAD) | 4:49.24 | |
| 41 | 1 | 2 | Britany van Lange (GUY) | 4:53.20 | |
| 42 | 1 | 5 | Tieri Erasito (FIJ) | 4:55.28 | |
| 43 | 1 | 3 | Anum Bandey (PAK) | 4:55.96 | |
| 44 | 1 | 7 | Grace Kimball (NMI) | 5:10.29 | |
| – | 4 | 3 | Ágnes Mutina (HUN) | DNS | |
| – | 4 | 5 | Liu Jing (CHN) | DNS | |
| – | 5 | 7 | Chiara Masini Luccetti (ITA) | DNS | |

### Final

| Rank | Lane | Name | Time | Notes |
| | 4 | Katie Hoff (USA) | 3:57.07 | CR |
| | 3 | Kylie Palmer (AUS) | 3:58.39 | |
| | 6 | Federica Pellegrini (ITA) | 3:59.52 | |
| 4 | 2 | Chloe Sutton (USA) | 4:00.05 | |
| 5 | 5 | Coralie Balmy (FRA) | 4:00.14 | |
| 6 | 8 | Li Xuanxu (CHN) | 4:02.38 | |
| 7 | 1 | Erika Villaécija (ESP) | 4:02.69 | |
| 8 | 7 | Patricia Castro (ESP) | 4:04.85 | |