Athletics at the 2008 Summer Olympics – Men's 400 metres Heat 7 Heat 7

| Rank_ | Lane | Athlete | Nationality | Time_ | React |
|---|---|---|---|---|---|
| 1 | 9 | Jeremy Wariner | United States | 45.23 | 0.253 |
| 2 | 6 | Tabarie Henry | Virgin Islands | 45.36 | 0.165 |
| 3 | 2 | Cedric van Branteghem | Belgium | 45.54 | 0.203 |
| 4 | 4 | David Gillick | Ireland | 45.83 | 0.275 |
| 5 | 5 | Maksim Dyldin | Russia | 46.03 | 0.194 |
| 6 | 3 | Myhaylo Knysh | Ukraine | 46.28 | 0.260 |
| 7 | 7 | Mathieu Gnanligo | Benin | 47.10 | 0.207 |
| 8 | 8 | Naiel Santiago d`Almeida | São Tomé and Príncipe | 49.08 | 0.178 |