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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Ana Guevara | MEX | 50.15 |
| 2 | Christine Amertil | BAH | 50.17 |
| 3 | Sanya Richards | USA | 50.54 |
| 4 | Christine Ohuruogu | GBR | 51.00 |
| 5 | Tiandra Ponteen | SKN | 51.33 |
| 6 | Svetlana Usovich | BLR | 51.42 |
| 7 | Hazel-Ann Regis | GRN | 51.47 |
| 8 | Egle Uljas | EST | 53.13 |
| Rank | Name | Nation | Time |
| 1 | Tonique Williams-Darling | BAH | 50.00 |
| 2 | DeeDee Trotter | USA | 50.14 |
| 3 | Natalya Nazarova | RUS | 50.63 |
| 4 | Fatou Bintou Fall | SEN | 51.21 |
| 5 | Kaltouma Nadjina | CHA | 51.57 |
| 6 | Estie Wittstock | RSA | 51.77 |
| 7 | Donna Fraser | GBR | 51.94 |
| 8 | Grazyna Prokopek | POL | 51.96 |
| Rank | Name | Nation | Time |
| 1 | Monique Hennagan | USA | 49.88 |
| 2 | Natalya Antyukh | RUS | 50.04 |
| 3 | Novlene Williams | JAM | 50.85 |
| 4 | Mariana Dimitrova | BUL | 51.20 |
| 5 | Aliann Pompey | GUY | 51.61 |
| 6 | Antonina Yefremova | UKR | 51.90 |
| 7 | Mireille Nguimgo | CMR | 52.21 |
| 8 | Lee McConnell | GBR | 52.63 |