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

The Women's 100 Backstroke swimming event at the 25th SEA Games was held on December 12, 2009.

## Results

### Final

| Place | Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | 1 | Tao Li | Singapore | 1:02.96 | GR |
| 2 | 3 | Shana Lim | Singapore | 1:03.56 | |
| 3 | 2 | Lai Kwan Chui | Malaysia | 1:03.91 | |
| 4 | 6 | Tiffani Sudharma | Indonesia | 1:05.10 | |
| 5 | 5 | Dorothy Hong | Philippines | 1:05.95 | |
| 6 | 7 | Chavisa Thaveesupsoonthorn | Thailand | 1:06.45 | |
| 7 | 8 | Thi Thom Duong | Vietnam | 1:06.87 | |
| 8 | 4 | Navarat Thongkaew | Thailand | 1:07.87 | |

### Preliminary heats

| Rank | Heat/Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | H1 L5 | Tiffani Sudharma | Indonesia | 1:05.37 | Q |
| 2 | H1 L4 | Shana Lim | Singapore | 1:05.82 | Q |
| 3 | H2 L5 | Lai Kwan Chui | Malaysia | 1:05.84 | Q |
| 4 | H2 L4 | Tao Li | Singapore | 1:06.11 | Q |
| 5 | H1 L3 | Dorothy Hong | Philippines | 1:06.80 | Q |
| 6 | H2 L3 | Chavisa Thaveesupsoonthorn | Thailand | 1:06.90 | Q |
| 7 | H1 L2 | Navarat Thongkaew | Thailand | 1:07.82 | Q |
| 8 | H1 L6 | Thi Thom Duong | Vietnam | 1:07.94 | Q |
| 9 | H2 L6 | Fibriani R Marita | Indonesia | 1:08.44 | |
| 10 | H2 L2 | Karmen Cheng | Malaysia | 1:09.27 | |
| 11 | H2 L7 | Hemthon Vitiny | Cambodia | 1:16.27 | |
| 12 | H1 L7 | Seng Sam Phors | Cambodia | 1:19.24 | |
| 13 | H2 L1 | D Daoheuang | Laos | 1:22.18 | |
| 14 | H1 L1 | N Napha | Laos | 1:32.33 | |
