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

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

## Results

### Final

| Place | Swimmer | Nation | Time |
| - | - | - | - |
| 1 | Glenn Sutanto | Indonesia | 56.42 |
| 2 | Rainer Ng | Singapore | 56.73 |
| 3 | Zach Ong | Singapore | 56.89 |
| 4 | Charles Walker | Philippines | 57.43 |
| 5 | Guntur Pratama | Indonesia | 57.58 |
| 6 | Huy Long Do | Vietnam | 58.07 |
| 7 | Ian James Barr | Malaysia | 58.28 |
| 8 | Puttiping H. | Thailand | 59.09 |

### Preliminary heats

| Rank | Heat | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | H1 | Charles Walker | Philippines | 59.31 | Q |
| 2 | H2 | Ian James Barr | Malaysia | 59.51 | Q |
| 3 | H2 | Rainer Ng | Singapore | 59.72 | Q |
| 4 | H2 | Puttiping H. | Thailand | 1:00.27 | Q |
| 5 | H1 | Glenn Victor | Indonesia | 1:00.50 | Q |
| 6 | H2 | Zach Ong | Singapore | 1:00.55 | Q |
| 7 | H2 | Guntur Pratama | Indonesia | 1:00.76 | Q |
| 8 | H2 | Huy Long Do | Vietnam | 1:01.18 | Q |
| 9 | H1 | Melvin Chua | Malaysia | 1:01.82 | |
| 10 | H1 | Radomyos Matjiur | Thailand | 1:03.01 | |
| 11 | H1 | Ryan Arabejo | Philippines | 1:07.14 | |
| 12 | H1 | N. Nilaphon | Laos | 1:18.49 | |
| 13 | H2 | S. Saylom | Laos | 1:21.59 | |
