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Date: 20 August 2004 / 21 August 2004 / 23 August 2004
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Jeremy Wariner | USA | 44.00 |
| 2 | Otis Harris | USA | 44.16 |
| 3 | Derrick Brew | USA | 44.42 |
| 4 | Alleyne Francique | GRN | 44.66 |
| 5 | Brandon Simpson | JAM | 44.76 |
| 6 | Davian Clarke | JAM | 44.83 |
| 7 | Leslie Djhone | FRA | 44.94 |
| 8 | Michael Blackwood | JAM | 45.55 |
| Semi-finals | |||
| 9 | Eric Milazar | MRI | 45.23 |
| 9 | Lewis Banda | ZIM | 45.23 |
| 11 | Chris Brown | BAH | 45.31 |
| 12 | Geyman Lopez | CUB | 45.52 |
| 13 | Gary Kikaya | COD | 45.58 |
| 13 | Carlos Santa | DOM | 45.58 |
| 15 | Hamdan Al-Bishi | KSA | 45.59 |
| 16 | Alejandro Cardenas | MEX | 45.64 |
| 17 | Saul Weigopwa | NGR | 45.67 |
| 18 | Ezra Sambu | KEN | 45.84 |
| 19 | Mathews Binu | IND | 45.97 |
| 20 | Cedric van Branteghem | BEL | 46.03 |
| 21 | Ingo Schultz | GER | 46.23 |
| 22 | Timothey Benjamin | GBR | 46.28 |
| 23 | Matija Sestak | SLO | 46.54 |
| Heats | |||
| 24 | California Molefe | BOT | 45.88 |
| 25 | Clinton Hill | AUS | 45.89 |
| 26 | Marcus la Grange | RSA | 45.95 |
| 27 | Young Talkmore Nyongani | ZIM | 46.03 |
| 28 | Sofiane Labidi | TUN | 46.04 |
| 29 | Casey Vincent | AUS | 46.09 |
| 30 | Daniel Caines | GBR | 46.15 |
| 31 | Yuki Yamaguchi | JPN | 46.16 |
| 31 | Zsolt Szeglet | HUN | 46.16 |
| 33 | Rohan Pradeep Kumara | SRI | 46.20 |
| 34 | Piotr Klimczak | POL | 46.23 |
| 35 | Malachi Davis | GBR | 46.28 |
| 36 | Ato Modibo | TTO | 46.29 |
| 37 | Vincent Mumo Kiilu | KEN | 46.31 |
| 38 | Nagmeldin Ali Abubakr | SUD | 46.32 |
| 39 | Jun Osakada | JPN | 46.39 |
| 40 | Oleg Mishukov | RUS | 46.41 |
| 41 | Andres Silva | URU | 46.48 |
| 42 | Adem Hecini | ALG | 46.50 |
| 43 | Stylianos Dimotsios | GRE | 46.51 |
| 44 | Mitsuhiro Sato | JPN | 46.70 |
| 45 | Lloyd Zvasiya | ZIM | 47.19 |
| 46 | David Canal | ESP | 47.23 |
| 47 | Sajid Muhammad | PAK | 47.45 |
| 48 | Dadi Denis | HAI | 47.57 |
| 49 | Luis Luna | VEN | 47.92 |
| 50 | Chris Lloyd | DMA | 47.98 |
| 51 | Jonni Lowe | HON | 48.06 |
| 52 | Moses Kamut | VAN | 48.14 |
| 53 | Evans Marie | SEY | 48.23 |
| 54 | Fawzi Al-Shammari | KUW | 48.25 |
| 55 | Takeshi Fujiwara | ESA | 48.46 |
| 56 | Anderson Santos | BRA | 48.77 |
| 57 | Youba Hmeida | MTN | 49.18 |
| 58 | Danilson Ricciuli | GBS | 49.27 |
| 59 | Saeed Al Adhreai | YEM | 49.39 |
| 60 | Abdulla Mohamed Hussein | SOM | 51.52 |
| Did not finish | |||
| Victor Kibet | KEN | ||
| Disqualified | |||
| Anton Galkin | RUS | ||
| Did not start | |||
| Lezin Elongo Ngoyikonda | CGO | ||