Swimming at the 2019 World Aquatics Championships – Women's 400 metre individual medley
The Women's 400 metre individual medley competition at the 2019 World Championships was held on 28 July 2019.Records
Prior to the competition, the existing world and championship records were as follows.Results
Heats
The heats were held on 28 July at 10:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | 4 | Katinka Hosszú | | 4:35.40 | Q |
| 2 | 2 | 4 | Yui Ohashi | | 4:37.23 | Q |
| 3 | 3 | 7 | Ye Shiwen | | 4:37.66 | Q |
| 4 | 3 | 1 | Emily Overholt | | 4:37.90 | Q |
| 5 | 3 | 3 | Ally McHugh | | 4:38.32 | Q |
| 6 | 3 | 5 | Fantine Lesaffre | | 4:38.40 | Q |
| 7 | 2 | 6 | Sydney Pickrem | | 4:38.59 | Q |
| 8 | 2 | 1 | Zsuzsanna Jakabos | | 4:38.93 | Q |
| 9 | 3 | 6 | Brooke Forde | | 4:39.74 | |
| 10 | 2 | 2 | Kim Seo-yeong | | 4:40.55 | |
| 11 | 2 | 3 | Aimee Willmott | | 4:41.24 | |
| 12 | 2 | 7 | Anja Crevar | | 4:41.59 | |
| 13 | 3 | 2 | Mireia Belmonte | | 4:42.16 | |
| 14 | 2 | 0 | Yu Yiting | | 4:42.52 | |
| 15 | 3 | 0 | Victoria Kaminskaya | | 4:43.03 | |
| 16 | 2 | 5 | Ilaria Cusinato | | 4:43.27 | |
| 17 | 2 | 8 | Viktoriya Zeynep Güneş | | 4:46.01 | |
| 18 | 3 | 9 | Jimena Pérez | | 4:47.51 | |
| 19 | 3 | 8 | Nguyễn Thị Ánh Viên | | 4:47.96 | |
| 20 | 1 | 2 | Katja Fain | | 4:48.24 | |
| 21 | 2 | 9 | Barbora Závadová | | 4:48.93 | |
| 22 | 1 | 5 | Rebecca Meder | | 4:53.99 | |
| 23 | 1 | 6 | Azzahra Permatahani | | 4:58.19 | |
| 24 | 1 | 7 | Maria Fe Muñoz | | 4:58.62 | |
| 25 | 1 | 4 | Aleksandra Knop | | 5:00.77 | |
| 26 | 1 | 3 | Claudia Gadea | | 5:01.11 | |
Final
The final was held on 28 July at 21:19.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Katinka Hosszú | | 4:30.39 | |
| 3 | Ye Shiwen | | 4:32.07 | |
| 5 | Yui Ohashi | | 4:32.33 | |
| 4 | 1 | Sydney Pickrem | | 4:36.72 | |
| 5 | 6 | Emily Overholt | | 4:37.42 | |
| 6 | 2 | Ally McHugh | | 4:38.34 | |
| 7 | 8 | Zsuzsanna Jakabos | | 4:39.15 | |
| 8 | 7 | Fantine Lesaffre | | 4:39.68 | |
