Swimming at the 2009 Southeast Asian Games – Women's 100 metre freestyle
# Swimming at the 2009 Southeast Asian Games – Women's 100 metre freestyle

The Women's 100 Freestyle swimming event at the 25th SEA Games was held on December 10, 2009.

## Results

### Final

| Place | Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | 4 | Quah Ting Wen | Singapore | 56.03 | GR |
| 2 | 5 | Natthanan Junkrajang | Thailand | 56.33 | |
| 3 | 6 | Amanda Lim | Singapore | 56.60 | |
| 4 | 7 | Jasmine Paler Alkhaldi | Philippines | 57.43 | |
| 5 | 3 | Jiratida Phinyosophon | Thailand | 57.46 | |
| 6 | 2 | Chui Lai Kwan | Malaysia | 57.59 | |
| 7 | 1 | Leung Chii Lin | Malaysia | 58.21 | |
| 8 | 8 | Enny Susilowati Margono | Indonesia | 59.64 | |

### Preliminary heats

| Rank | Heat/Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | H2 L4 | Quah Ting Wen | Singapore | 56.95 | Q |
| 2 | H2 L5 | Natthanan Junkrajang | Thailand | 57.28 | Q |
| 3 | H2 L3 | Jiratida Phinyosophon | Thailand | 57.58 | Q |
| 4 | H1 L4 | Amanda Lim | Singapore | 57.96 | Q |
| 5 | H2 L6 | Chui Lai Kwan | Malaysia | 58.25 | Q |
| 5 | H1 L6 | Jasmine Paler Alkhaldi | Philippines | 58.25 | Q |
| 7 | H1 L5 | Leung Chii Lin | Malaysia | 58.75 | Q |
| 8 | H1 L3 | Enny Susilowati Margono | Indonesia | 59.50 | Q |
| 9 | H1 L2 | Heidi Gem Chua Ong | Philippines | 59.79 | |
| 10 | H2 L2 | Tran Tam Nguyen | Vietnam | 1:00.02 | |
| 11 | H2 L1 | Nguyen Thi Ngoc Yen | Vietnam | 1:00.51 | |
| 12 | H2 L7 | Ressa Kania Dewi | Indonesia | 1:01.39 | |
| 13 | H1 L7 | Hemthon Vitiny | Cambodia | 1:08.71 | |
| 14 | H1 L1 | Thepaksone Chindavong | Laos | 1:14.64 | |
| 15 | H1 L8 | Napha Xinsaivolavong | Laos | 1:22.18 | |
