| Event: | Men's 400m Individual Medley |
| Competition: | 2012 Short Course Worlds |
| Dates: | 13 December (heats and final) |
| Win Value: | 3:59.15 |
| Gold: | Daiya Seto |
| Goldnoc: | JPN |
| Silver: | László Cseh |
| Silvernoc: | HUN |
| Bronze: | Dávid Verrasztó |
| Bronzenoc: | HUN |
| Prev: | 2010 |
| Next: | 2014 |
See main article: 2012 FINA World Swimming Championships (25 m).
The men's 400 metre individual medley event at the 11th FINA World Swimming Championships (25m) took place 13 December 2012 at the Sinan Erdem Dome.
Prior to this competition, the existing world and championship records were as follows.
No new records were set during this competition.
43 swimmers participated in 5 heats.[1]
| Rank | Heat | Lane | Name | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 5 | 4 | 4:04.28 | Q | ||
| 2 | 4 | 4 | 4:04.61 | Q | ||
| 3 | 4 | 5 | 4:05.99 | Q | ||
| 4 | 3 | 4 | 4:06.64 | Q | ||
| 5 | 4 | 3 | 4:07.42 | Q | ||
| 6 | 5 | 5 | 4:07.78 | Q | ||
| 7 | 3 | 5 | 4:08.38 | Q | ||
| 8 | 5 | 1 | 4:08.46 | Q | ||
| 9 | 3 | 3 | 4:09.59 | |||
| 10 | 4 | 0 | 4:09.76 | |||
| 11 | 4 | 6 | 4:10.18 | |||
| 12 | 5 | 9 | 4:10.38 | |||
| 13 | 4 | 1 | 4:11.08 | |||
| 14 | 5 | 2 | 4:11.17 | |||
| 15 | 4 | 2 | 4:11.60 | |||
| 16 | 3 | 6 | 4:12.36 | |||
| 17 | 5 | 6 | 4:12.70 | |||
| 18 | 3 | 1 | 4:13.75 | |||
| 19 | 5 | 8 | 4:14.42 | |||
| 20 | 3 | 9 | 4:14.44 | |||
| 21 | 3 | 2 | 4:14.60 | |||
| 22 | 5 | 3 | 4:14.89 | |||
| 23 | 4 | 7 | 4:15.52 | |||
| 24 | 4 | 8 | 4:15.55 | |||
| 25 | 5 | 7 | 4:16.20 | |||
| 26 | 3 | 8 | 4:17.68 | |||
| 27 | 3 | 7 | 4:18.17 | |||
| 28 | 2 | 3 | 4:18.54 | NR | ||
| 29 | 2 | 5 | 4:22.01 | NR | ||
| 30 | 3 | 0 | 4:23.98 | |||
| 31 | 2 | 6 | 4:24.62 | |||
| 32 | 1 | 6 | 4:26.13 | NR | ||
| 33 | 2 | 2 | 4:26.32 | |||
| 34 | 4 | 9 | 4:26.70 | |||
| 35 | 2 | 1 | 4:28.05 | |||
| 36 | 5 | 0 | 4:29.28 | |||
| 37 | 2 | 7 | 4:30.70 | |||
| 38 | 1 | 5 | 4:32.10 | |||
| 39 | 2 | 8 | 4:35.81 | |||
| 40 | 2 | 0 | 4:39.80 | |||
| 41 | 2 | 9 | 4:54.29 | |||
| 1 | 4 | |||||
| 2 | 4 | |||||
| 1 | 3 |
The final was held at 19:10.[2]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 |  | 3:59.15 | AS | |||
| 5 |  | 4:00.50 | ||||
| 6 | | 4:02.87 | ||||
| 4 | 7 | | 4:04.13 | |||
| 5 | 3 |  | 4:04.29 | NR | ||
| 6 | 1 | 4:06.81 | ||||
| 7 | 8 | 4:07.67 | ||||
| 8 | 2 | 4:09.95 |