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

The Women's 100 Butterfly swimming event at the 2009 SEA Games was held on December 12, 2009, in Vientiane, Laos.

## Results

### Final

| Place | Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | 1 | Tao Li | Singapore | 59.24 | GR |
| 2 | 3 | Marellyn Liew | Malaysia | 1:01.04 | |
| 3 | 2 | Natnapa Prommuenwai | Thailand | 1:01.79 | |
| 4 | 6 | T Kim Tuyen Nguyen | Vietnam | 1:02.11 | |
| 5 | 5 | Jasmine Alkhaldi | Philippines | 1:02.16 | |
| 6 | 7 | Maria Gandionco | Philippines | 1:02.42 | |
| 7 | 8 | Hii Siew Siew | Malaysia | 1:03.51 | |
| 8 | 4 | Koh Ting Ting | Singapore | 1:03.78 | |

### Preliminary heats

| Rank | Heat/Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | H1 L3 | Koh Ting Ting | Singapore | 1:03.47 | Q |
| 2 | H1 L2 | Jasmine Alkhaldi | Philippines | 1:03.50 | Q |
| 3 | H1 L4 | Marellyn Liew | Malaysia | 1:03.69 | Q |
| 4 | H2 L5 | T Kim Tuyen Nguyen | Vietnam | 1:03.74 | Q |
| 5 | H1 L5 | Natnapa Prommuenwai | Thailand | 1:03.87 | Q |
| 6 | H2 L4 | Tao Li | Singapore | 1:03.88 | Q |
| 6 | H2 L6 | Maria Gandionco | Philippines | 1:03.88 | Q |
| 8 | H2 L3 | Hii Siew Siew | Malaysia | 1:04.05 | Q |
| 9 | H1 L6 | Ressa Ressa | Indonesia | 1:05.41 | |
| 10 | H2 L7 | T Ngor Yen Nguyen | Vietnam | 1:07.77 | |
| 11 | H2 L2 | Tiffani Sudharma | Indonesia | 1:08.10 | |
| 12 | H1 L7 | V Veomany | Laos | 1:29.25 | |
