2008 IAAF World Indoor Championships – Men's 400 metres Heats Heats

| Heat | Lane | Name_ | Country | Mark |
|---|---|---|---|---|
| 1 | 6 | Sean Wroe | Australia | 47.23 PB |
| 1 | 5 | Richard Buck | United Kingdom | 47.54 |
| 1 | 4 | Greg Nixon | United States | 47.64 |
| 1 | 2 | Mark Ujakpor | Spain | 47.94 |
| 1 | 3 | Yoann Décimus | France | DNS |
| 2 | 4 | Nery Brenes | Costa Rica | 46.45 NR |
| 2 | 6 | Chris Lloyd | Dominica | 46.79 |
| 2 | 3 | Denis Alekseyev | Russia | 47.07 |
| 2 | 5 | Steven Green | United Kingdom | 47.44 |
| 2 | 2 | Arismendy Peguero | Dominican Republic | 47.45 |
| 3 | 6 | Tyler Christopher | Canada | 47.06 |
| 3 | 2 | California Molefe | Botswana | 47.22 |
| 3 | 5 | Michael Mathieu | Bahamas | 47.34 |
| 3 | 3 | Clemens Zeller | Austria | 47.34 |
| 3 | 4 | Nelton Ndebele | Zimbabwe | DNS |