2012 FINA World Swimming Championships (25 m) – Women's 400 metre individual medley
The women's 400 metre individual medley event at the 11th FINA World Swimming Championships took place 12 December 2012 at the Sinan Erdem Dome.Records
Prior to this competition, the existing world and championship records were as follows.
The following records were established during the competition:
Results
Heats
25 swimmers participated in 3 heats.
| Rank | Heat | Lane | Name | Time | Notes |
| 1 | 3 | 4 | | 4:28.91 | Q |
| 2 | 2 | 4 | | 4:29.22 | Q |
| 3 | 3 | 5 | | 4:29.98 | Q |
| 4 | 1 | 4 | | 4:30.88 | Q |
| 5 | 2 | 5 | | 4:31.71 | Q |
| 6 | 3 | 3 | | 4:32.49 | Q |
| 7 | 1 | 2 | | 4:33.01 | Q |
| 8 | 1 | 5 | | 4:34.67 | Q |
| 9 | 1 | 6 | | 4:34.70 | |
| 10 | 2 | 3 | | 4:37.66 | |
| 11 | 3 | 6 | | 4:37.84 | |
| 12 | 1 | 0 | | 4:38.93 | |
| 13 | 3 | 7 | | 4:40.04 | |
| 14 | 2 | 6 | | 4:40.19 | |
| 14 | 2 | 7 | | 4:40.19 | |
| 16 | 3 | 1 | | 4:40.45 | |
| 17 | 1 | 3 | | 4:42.14 | |
| 18 | 2 | 8 | | 4:42.22 | NR |
| 19 | 3 | 2 | | 4:45.45 | |
| 20 | 1 | 7 | | 4:45.66 | |
| 21 | 1 | 1 | | 4:50.85 | |
| 22 | 2 | 0 | | 4:52.29 | |
| 23 | 3 | 8 | | 5:00.97 | |
| 24 | 3 | 0 | | 5:24.51 | |
| 2 | 1 | | | |
| 1 | 8 | | | |
| 2 | 2 | | | |
Final
The final was held at 20:16.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Hannah Miley | GBR | 4:23.14 | CR, ER |
| 3 | Ye Shiwen | CHN | 4:23.33 | |
| 5 | Katinka Hosszú | HUN | 4:25.95 | |
| 4 | 6 | Zsuzsanna Jakabos | HUN | 4:26.99 | |
| 5 | 1 | Madeline Dirado | USA | 4:28.55 | |
| 6 | 2 | Miho Takahashi | JPN | 4:31.55 | |
| 7 | 7 | Emu Higuchi | JPN | 4:35.59 | |
| 8 | 8 | Barbora Závadová | CZE | 4:37.30 | |
