Athletics at the 2008 Summer Olympics – Men's 400 metres Heat 6 Heat 6

| Rank_ | Lane | Athlete | Nationality | Time_ | React |
|---|---|---|---|---|---|
| 1 | 7 | Andrew Steele | Great Britain | 44.94 | 0.248 |
| 2 | 5 | Renny Quow | Trinidad and Tobago | 45.13 | 0.266 |
| 3 | 6 | Michael Mathieu | Bahamas | 45.17 | 0.193 |
| 4 | 8 | Michael Blackwood | Jamaica | 45.56 | 0.204 |
| 5 | 2 | Tyler Christopher | Canada | 45.67 | 0.172 |
| 6 | 3 | Joel Phillip | Grenada | 46.30 | 0.198 |
| 7 | 9 | Félix Martinez | Puerto Rico | 46.46 | 0.347 |
| 8 | 4 | Daniel Dąbrowski | Poland | 47.83 | 0.260 |