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Date: 15 August 2004 / 15 August 2004 / 16 August 2004
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Aaron Peirsol | USA | 54.06 |
| 2 | Markus Rogan | AUT | 54.35 |
| 3 | Tomomi Morita | JPN | 54.36 |
| 4 | Lenny Krayzelburg | USA | 54.38 |
| 5 | Matt Welsh | AUS | 54.52 |
| 6 | Laszlo Cseh | HUN | 54.61 |
| 7 | Steffen Driesen | GER | 54.63 |
| 8 | Marco di Carli | GER | 55.27 |
| Semi-finals | |||
| 9 | Arkady Vyatchanin | RUS | 55.20 |
| 10 | Razvan Florea | ROU | 55.27 |
| 11 | Ouyang Kunpeng | CHN | 55.28 |
| 12 | Gregor Tait | GBR | 55.31 |
| 13 | Gerhard Zandberg | RSA | 55.76 |
| 14 | Gordan Kozulj | CRO | 56.02 |
| 15 | Alex Lim | MAS | 56.08 |
| 16 | Simon Dufour | FRA | 56.15 |
| Heats | |||
| 17 | Aristeidis Grigoriadis | GRE | 55.85 |
| 17 | Josh Watson | AUS | 55.85 |
| 19 | Evgeny Aleshin | RUS | 55.91 |
| 20 | Ryan Pini | PNG | 55.97 |
| 21 | Pierre Roger | FRA | 56.07 |
| 22 | Cam Gibson | NZL | 56.14 |
| 23 | Adam Mania | POL | 56.20 |
| 24 | Darius Grigalionis | LTU | 56.21 |
| 25 | Nicholas Neckles | BAR | 56.32 |
| 26 | Derya Buyukuncu | TUR | 56.34 |
| 27 | Lubos Krizko | SVK | 56.62 |
| 27 | Volodymyr Nikolaychuk | UKR | 56.62 |
| 27 | Matt Rose | CAN | 56.62 |
| 30 | Sung Min | KOR | 56.78 |
| 31 | Ahmed Hussein | EGY | 56.86 |
| 32 | Paulo Machado | BRA | 57.07 |
| 33 | Eduardo German Otero | ARG | 57.28 |
| 34 | Peter Horvath | HUN | 57.29 |
| 35 | Aschwin Wildeboer | ESP | 57.35 |
| 36 | Matti Maki | FIN | 57.57 |
| 37 | George Gleason | ISV | 57.64 |
| 38 | Christopher Vythoulkas | BAH | 58.31 |
| 39 | Brendan Ashby | ZIM | 58.91 |
| 40 | Igor Beretic | SCG | 59.38 |
| 41 | Stanislav Ossinkskiy | KAZ | 59.92 |
| 42 | Alexandr Ivlev | MDA | 1:00.13 |
| 43 | Danil Bugakov | UZB | 1:02.28 |
| 44 | Omar Abu Fares | JOR | 1:02.36 |
| Did not start | |||
| Donnie Defreitas | VIN | ||