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The Women's 400 Individual Medley (or "I.M.") swimming event at the 2009 SEA Games was held in December 2009.
The Games Record at the start of the event was 4:51.87, swum by Joscelin Yeo at the 1999 SEA Games (on August 13).
Results
Final
| Place | Swimmer | Nation | Time | Notes |
|---|---|---|---|---|
| 1 | Natthanan J. |  Thailand |
4:55.07 | |
| 2 | QUAH Ting Wen |  Singapore |
4:56.32 | |
| 3 | Hui Yu Koh | Singapore |
4:56.73 | |
| 4 | Fibriani Marita |  Indonesia |
4:57.16 | |
| 5 | Chavisa T. | Thailand |
4:58.30 | |
| 6 | SIOW Yi Ting |  Malaysia |
5:05.45 | |
| 7 | T Kim Tuyen Nguyen |  Vietnam |
5:05.45 | |
| 8 | Ressa Ressa | Indonesia |
5:17.78 |
Preliminary heats
| Rank | Swimmer | Nation | Time | Notes |
|---|---|---|---|---|
| 1 | Fibriani Marita | Indonesia |
5:09.82 | Q |
| 2 | SIOW Yi Ting | Malaysia |
5:11.21 | Q |
| 3 | Chavisa T. | Thailand |
5:13.84 | Q |
| 4 | Natthanan J. | Thailand |
5:18.71 | Q |
| 5 | Ressa Ressa | Indonesia |
5:19.18 | Q |
| 6 | QUAH Ting Wen | Singapore |
5:19.06 | Q |
| 7 | Hui Yu Koh | Singapore |
5:20.33 | Q |
| 8 | T Kim Tuyen Nguyen | Vietnam |
5:27.06 | Q |
| 9 | Wei Li Lai | Malaysia |
5:27.23 |