Athletics at the 2008 Summer Olympics – Men's 400 metres Heat 3 Heat 3

| Rank_ | Lane | Athlete | Nationality | Time_ | React |
|---|---|---|---|---|---|
| 1 | 8 | Nery Brenes | Costa Rica | 45.36 | 0.196 |
| 2 | 3 | James Godday | Nigeria | 45.49 | 0.200 |
| 3 | 9 | Andretti Bain | Bahamas | 45.96 | 0.225 |
| 4 | 7 | Niko Verekauta | Fiji | 46.32 | 0.161 |
| 5 | 6 | Fernando de Almeida | Brazil | 46.60 | 0.158 |
| 6 | 2 | Lewis Banda | Zimbabwe | 46.76 | 0.244 |
| 7 | 4 | Vincent Mumo Kiilu | Kenya | 46.79 | 0.212 |
| 8 | 5 | Nagmeldin Ali Abubakr | Sudan | 47.12 | 0.247 |