Swimming at the 2009 Southeast Asian Games – Men's 400 metre freestyle
# Swimming at the 2009 Southeast Asian Games – Men's 400 metre freestyle

The Men's 400 Freestyle swimming event at the 2009 SEA Games was held on December 12, 2009.

## Results

### Final

| Place | Swimmer | Nation | Time | Notes |
| - | - | - | - | - |
| 1 | Daniel Bego | Malaysia | 3:53.99 | GR |
| 2 | Ryan Arabejo | Philippines | 3:56.06 | |
| 3 | Sanit Tiewong | Thailand | 3:57.79 | |
| 4 | Marcus Cheah | Singapore | 3:59.44 | |
| 5 | Kevin Yeap | Malaysia | 4:01.36 | |
| 6 | Akbar Nasution | Indonesia | 4:05.32 | |
| 7 | Triady Fauzi | Indonesia | 4:07.99 | |
| 8 | Jessie Lacuna | Philippines | 4:08.90 | |

### Preliminary heats

| Rank | Heat | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | H1 | Ryan Arabejo | Philippines | 4:05.73 | Q |
| 2 | H1 | Kevin Yeap | Malaysia | 4:06.71 | Q |
| 3 | H1 | Akbar Nasution | Indonesia | 4:07.74 | Q |
| 4 | H2 | Marcus Cheah | Singapore | 4:07.90 | Q |
| 5 | H2 | Daniel Bego | Malaysia | 4:07.98 | Q |
| 6 | H2 | Sanit Tiewong | Thailand | 4:08.91 | Q |
| 7 | H2 | Triady Fauzi | Indonesia | 4:10.10 | Q |
| 8 | H2 | Jessie Lacuna | Philippines | 4:10.30 | Q |
| 9 | H1 | Nithipanya A. | Thailand | 4:14.08 | |
| 10 | H1 | Danny Yeo | Singapore | 4:34.77 | |
| 11 | H1 | Maximov Chamraen Y | Cambodia | 5:02.66 | |
| 12 | H2 | Hem Thonponloeu | Cambodia | 5:06.42 | |
| 13 | H2 | M. Mitpaserth | Laos | 6:19.09 | |
| 14 | H1 | S. Sergey | Laos | 6:23.57 | |
