Swimming at the 2017 World Aquatics Championships – Women's 400 metre individual medley
# Swimming at the 2017 World Aquatics Championships – Women's 400 metre individual medley

The Women's 400 metre individual medley competition at the 2017 World Championships was held on 30 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.

| World record | Katinka Hosszú (HUN) | 4:26.36 | Rio de Janeiro, Brazil | 6 August 2016 |
| - | - | - | - | - |
| Competition record | Katinka Hosszú (HUN) | 4:30.31 | Rome, Italy | 26 July 2009 |

The following new records were set during this competition.

| Date | Event | Name | Nationality | Time | Record |
| - | - | - | - | - | - |
| 30 July | Final | Katinka Hosszú | Hungary | 4:29.33 | CR |

## Results

### Heats

The heats were held at 09:30.

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - | - |
| 1 | 3 | 4 | Katinka Hosszú | Hungary | 4:33.90 | Q |
| 2 | 3 | 5 | Mireia Belmonte | Spain | 4:35.29 | Q |
| 3 | 3 | 3 | Elizabeth Beisel | United States | 4:36.18 | Q |
| 4 | 2 | 6 | Sydney Pickrem | Canada | 4:36.25 | Q |
| 5 | 3 | 6 | Sakiko Shimizu | Japan | 4:36.43 | Q |
| 6 | 2 | 3 | Leah Smith | United States | 4:36.94 | Q |
| 7 | 2 | 4 | Yui Ohashi | Japan | 4:36.97 | Q |
| 8 | 2 | 5 | Hannah Miley | Great Britain | 4:37.14 | Q |
| 9 | 3 | 2 | Kim Seo-yeong | South Korea | 4:39.80 | |
| 10 | 3 | 7 | Nguyễn Thị Ánh Viên | Vietnam | 4:40.39 | |
| 11 | 2 | 8 | Joanna Maranhão | Brazil | 4:41.29 | |
| 12 | 2 | 1 | Zsuzsanna Jakabos | Hungary | 4:41.40 | |
| 13 | 3 | 1 | Zhou Min | China | 4:42.26 | |
| 14 | 3 | 0 | Viktoriya Zeynep Güneş | Turkey | 4:42.27 | |
| 15 | 2 | 9 | Ye Shiwen | China | 4:43.40 | |
| 16 | 1 | 3 | Kaylee McKeown | Australia | 4:43.61 | |
| 17 | 2 | 0 | Victoria Kaminskaya | Portugal | 4:44.96 | |
| 18 | 3 | 8 | Barbora Závadová | Czech Republic | 4:46.75 | |
| 19 | 2 | 2 | Mary-Sophie Harvey | Canada | 4:46.88 | |
| 20 | 2 | 7 | Abbie Wood | Great Britain | 4:47.30 | |
| 21 | 1 | 6 | Monika González | Mexico | 4:48.00 | |
| 22 | 3 | 9 | Anja Crevar | Serbia | 4:48.53 | |
| 23 | 1 | 5 | Helena Gasson | New Zealand | 4:49.35 | |
| 24 | 1 | 4 | Virginia Bardach | Argentina | 4:53.22 | |
| 25 | 1 | 2 | Ilektra Lebl | Greece | 4:56.95 | |
| 26 | 1 | 7 | Azzahra Permatahani | Indonesia | 4:57.00 | |
| 27 | 1 | 1 | Sara Nysted | Faroe Islands | 5:21.21 | |
| | 1 | 8 | Sayani Ghosh | India | DNS | DNS |

### Final

The final was held at 18:20.

| Rank | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - |
| | 4 | Katinka Hosszú | Hungary | 4:29.33 | CR |
| | 5 | Mireia Belmonte | Spain | 4:32.17 | |
| | 6 | Sydney Pickrem | Canada | 4:32.88 | |
| 4 | 1 | Yui Ohashi | Japan | 4:34.50 | |
| 5 | 2 | Sakiko Shimizu | Japan | 4:35.62 | |
| 6 | 7 | Leah Smith | United States | 4:36.09 | |
| 7 | 3 | Elizabeth Beisel | United States | 4:37.63 | |
| 8 | 8 | Hannah Miley | Great Britain | 4:38.34 | |
