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Date: 15 August 2004
Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Aaron Peirsol | USA | 54.34 |
| 2 | Markus Rogan | AUT | 54.42 |
| 3 | Steffen Driesen | GER | 54.64 |
| 4 | Ouyang Kunpeng | CHN | 55.28 |
| 5 | Gregor Tait | GBR | 55.31 |
| 6 | Gerhard Zandberg | RSA | 55.76 |
| 7 | Gordan Kozulj | CRO | 56.02 |
| 8 | Alex Lim | MAS | 56.08 |
| Rank | Name | Nation | Time |
| 1 | Tomomi Morita | JPN | 54.62 |
| 2 | Lenny Krayzelburg | USA | 54.63 |
| 3 | Matt Welsh | AUS | 54.69 |
| 4 | Laszlo Cseh | HUN | 54.86 |
| 5 | Marco di Carli | GER | 55.03 |
| 6 | Arkady Vyatchanin | RUS | 55.20 |
| 7 | Razvan Florea | ROU | 55.27 |
| 8 | Simon Dufour | FRA | 56.15 |