Swimming at the 2013 World Aquatics Championships – Women's 400 metre individual medley
The women's 400 metre individual medley event in swimming at the 2013 World Aquatics Championships took place on 4 August at the Palau Sant Jordi in Barcelona, Spain.
Records
Prior to this competition, the existing world and championship records were:Results
Heats
The heats were held at 10:24.| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Katinka Hosszú | 4:32.72 | Q | |
| 2 | 2 | 5 | Mireia Belmonte | 4:34.64 | Q | |
| 3 | 4 | 4 | Ye Shiwen | 4:34.93 | Q | |
| 3 | 4 | 3 | Zsuzsanna Jakabos | 4:34.93 | Q | |
| 5 | 4 | 5 | Hannah Miley | 4:34.94 | Q | |
| 6 | 3 | 4 | Elizabeth Beisel | 4:35.17 | Q | |
| 7 | 3 | 5 | Madeline Dirado | 4:37.39 | Q | |
| 8 | 3 | 3 | Miyu Otsuka | 4:37.77 | Q | |
| 9 | 2 | 3 | Aimee Willmott | 4:38.43 | ||
| 10 | 3 | 7 | Chen Xinyi | 4:39.54 | ||
| 11 | 3 | 2 | Alexa Komarnycky | 4:39.94 | ||
| 12 | 4 | 7 | Barbora Závadová | 4:41.88 | ||
| 13 | 4 | 6 | Stefania Pirozzi | 4:42.33 | ||
| 14 | 3 | 6 | Beatriz Gómez Cortés | 4:42.78 | ||
| 15 | 4 | 2 | Yana Martynova | 4:44.03 | ||
| 16 | 2 | 2 | Stina Gardell | 4:44.50 | ||
| 17 | 4 | 1 | Joanna Melo | 4:44.55 | ||
| 18 | 2 | 6 | Miho Takahashi | 4:45.70 | ||
| 19 | 2 | 7 | Erika Seltenreich-Hodgson | 4:46.11 | ||
| 20 | 4 | 0 | Susana Escobar | 4:47.18 | NR | |
| 21 | 2 | 8 | Nguyen Thi Anh Vien | 4:47.60 | ||
| 22 | 3 | 0 | Rene Warnes | 4:48.11 | ||
| 23 | 4 | 9 | Samantha Lucie-Smith | 4:49.73 | ||
| 24 | 4 | 8 | Samantha Arevalo | 4:50.03 | ||
| 25 | 3 | 8 | Victoria Kaminskaya | 4:52.12 | ||
| 26 | 2 | 1 | Hanna Dzerkal | 4:53.34 | ||
| 27 | 1 | 5 | Zara Bailey | 4:54.14 | ||
| 28 | 1 | 4 | Siow Yi Ting | 4:54.84 | ||
| 29 | 2 | 0 | Tanja Kylliainen | 4:55.54 | ||
| 30 | 1 | 3 | Maria Far Núñez | 5:14.48 | ||
| 3 | 1 | Ranohon Amanova |
Final
The final was held at 19:14.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Katinka Hosszú | 4:30.41 | |||
| 5 | Mireia Belmonte | 4:31.21 | |||
| 7 | Elizabeth Beisel | 4:31.69 | |||
| 4 | 1 | Madeline Dirado | 4:32.70 | ||
| 5 | 2 | Hannah Miley | 4:34.16 | ||
| 6 | 6 | Zsuzsanna Jakabos | 4:34.50 | ||
| 7 | 3 | Ye Shiwen | 4:38.51 | ||
| 8 | 8 | Miyu Otsuka | 4:39.21 |