Swimming at the 2015 World Aquatics Championships – Women's 400 metre individual medley
The Women's 400 metre individual medley competition of the swimming events at the 2015 World Aquatics Championships was held on 9 August with the heats and the final.Records
Prior to the competition, the existing world and championship records were as follows.Results
Heats
The heats were held at 10:00.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Katinka Hosszú | | 4:32.78 | Q |
| 2 | 4 | 7 | Barbora Závadová | | 4:35.60 | Q, NR |
| 3 | 4 | 8 | Emily Overholt | | 4:35.86 | Q |
| 4 | 3 | 4 | Hannah Miley | | 4:36.11 | Q |
| 4 | 3 | 3 | Maya DiRado | | 4:36.11 | Q |
| 6 | 4 | 6 | Sakiko Shimizu | | 4:36.16 | Q |
| 7 | 4 | 3 | Aimee Willmott | | 4:36.82 | Q |
| 8 | 3 | 2 | Lara Grangeon | | 4:38.20 | Q |
| 9 | 3 | 0 | Anja Klinar | | 4:38.39 | |
| 10 | 3 | 8 | | | 4:38.78 | NR |
| 11 | 4 | 2 | Zsuzsanna Jakabos | | 4:38.94 | |
| 12 | 4 | 5 | Elizabeth Beisel | | 4:38.96 | |
| 13 | 3 | 6 | Keryn McMaster | | 4:39.05 | |
| 14 | 3 | 1 | Sydney Pickrem | | 4:40.60 | |
| 15 | 3 | 5 | Ye Shiwen | | 4:42.96 | |
| 16 | 2 | 3 | Chihiro Igarashi | | 4:43.06 | |
| 17 | 2 | 5 | Franziska Hentke | | 4:43.51 | |
| 18 | 2 | 4 | Nam Yoo-sun | | 4:43.83 | |
| 19 | 3 | 7 | Joanna Maranhão | | 4:44.40 | |
| 20 | 4 | 0 | Beatriz Gómez Cortés | | 4:44.51 | |
| 21 | 4 | 1 | Tessa Wallace | | 4:44.93 | |
| 22 | 2 | 2 | Jördis Steinegger | | 4:45.50 | |
| 23 | 3 | 9 | Fantine Lesaffre | | 4:46.06 | |
| 24 | 2 | 8 | Ranohon Amanova | | 4:47.85 | |
| 25 | 4 | 9 | Stina Gardell | | 4:48.65 | |
| 26 | 2 | 1 | Anja Crevar | | 4:50.04 | |
| 27 | 2 | 6 | Zhou Min | | 4:50.36 | |
| 28 | 2 | 0 | Virginia Bardach | | 4:51.59 | |
| 29 | 2 | 9 | Martina van Berkel | | 4:51.79 | |
| 30 | 1 | 4 | Phiangkhwan Pawapotako | | 4:53.15 | |
| 31 | 2 | 7 | Victoria Kaminskaya | | 4:53.47 | |
| 32 | 1 | 5 | Gizem Bozkurt | | 4:56.39 | |
| 33 | 1 | 6 | Maria Far Nuñez | | 5:05.55 | |
| 34 | 1 | 3 | Georgina González | | 5:05.62 | |
| 35 | 1 | 2 | Rebeca Quinteros | | 5:17.71 | |
Final
The final was held at 18:49.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Katinka Hosszú | | 4:30.39 | |
| 2 | Maya DiRado | | 4:31.71 | |
| 3 | Emily Overholt | | 4:32.52 | NR |
| 4 | 6 | Hannah Miley | | 4:34.79 | |
| 5 | 5 | Barbora Závadová | | 4:36.73 | |
| 6 | 7 | Sakiko Shimizu | | 4:37.19 | |
| 7 | 1 | Aimee Willmott | | 4:38.75 | |
| 8 | 8 | Lara Grangeon | | 4:40.98 | |
