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Date: 19 August 2004 / 19 August 2004 / 20 August 2004
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Michael Phelps | USA | 51.25 |
| 2 | Ian Crocker | USA | 51.29 |
| 3 | Andriy Serdinov | UKR | 51.36 |
| 4 | Thomas Rupprath | GER | 52.27 |
| 5 | Igor Marchenko | RUS | 52.32 |
| 6 | Gabriel Mangabeira | BRA | 52.34 |
| 7 | Duje Draganja | CRO | 52.46 |
| 8 | Geoffrey Huegill | AUS | 52.56 |
| Semi-finals | |||
| 9 | Takashi Yamamoto | JPN | 52.81 |
| 10 | Evgeny Korotyshkin | RUS | 52.85 |
| 11 | Franck Esposito | FRA | 52.88 |
| 12 | Michael Mintenko | CAN | 52.89 |
| 13 | Corney Swanepoel | NZL | 52.99 |
| 13 | Helge Meeuw | GER | 52.99 |
| 15 | James Hickman | GBR | 53.10 |
| 16 | Milorad Cavic | SCG | 53.12 |
| Heats | |||
| 17 | Kaio Almeida | BRA | 53.22 |
| 18 | Ryan Pini | PNG | 53.26 |
| 19 | Joris Keizer | NED | 53.41 |
| 20 | Adam Pine | AUS | 53.45 |
| 21 | Denys Sylantyev | UKR | 53.46 |
| 22 | Todd Cooper | GBR | 53.48 |
| 23 | Mattia Nalesso | ITA | 53.49 |
| 24 | Simao Morgado | POR | 53.53 |
| 25 | Frederick Bousquet | FRA | 53.63 |
| 26 | Pavel Lagoun | BLR | 53.87 |
| 27 | Ioan Gherghel | ROU | 53.89 |
| 28 | Jere Hard | FIN | 54.02 |
| 29 | Peter Mankoc | SLO | 54.14 |
| 30 | Eugene Botes | RSA | 54.15 |
| 31 | Sotirios Pastras | GRE | 54.20 |
| 32 | Erik Andersson | SWE | 54.26 |
| 33 | Josh Ilika Brenner | MEX | 54.29 |
| 34 | Zsolt Gaspar | HUN | 54.43 |
| 35 | Rimvydas Salcius | LTU | 54.46 |
| 36 | Luis Rojas | VEN | 54.58 |
| 37 | Camilo Becerra | COL | 54.71 |
| 38 | Jeong Doo-Hee | KOR | 54.76 |
| 39 | Michal Rubacek | CZE | 54.87 |
| 40 | Georgi Palazov | BUL | 54.91 |
| 41 | Rustam Khudiyev | KAZ | 55.03 |
| 42 | Hjortur Mar Reynisson | ISL | 55.12 |
| 43 | Wu Peng | CHN | 55.17 |
| 44 | Eduardo German Otero | ARG | 55.24 |
| 45 | Aleksandar Miladinovski | MKD | 55.71 |
| 46 | Oleg Lyashko | UZB | 55.90 |
| 47 | Juan Pablo Valdivieso | PER | 55.98 |
| 48 | Aghiles Slimani | ALG | 56.22 |
| 49 | Onur Uras | TUR | 56.37 |
| 50 | Nicholas Rees | BAH | 56.39 |
| 51 | Gordon Touw Ngie Tjouw | SUR | 56.68 |
| 52 | Conrad Francis | SRI | 56.80 |
| 53 | Andrejs Duda | LAT | 56.81 |
| 54 | Andy Wibowo | INA | 56.86 |
| 55 | Daniel O'Keeffe | GUM | 57.39 |
| 56 | Davy Bisslik | ARU | 57.85 |
| 57 | Joao Luis Cardoso Matias | ANG | 58.92 |
| 58 | Fernando Medrano-Medina | NCA | 1:00.91 |
| 59 | Rad Aweisat | PLE | 1:01.60 |