| Men's 100m Freestyle at the 2003 FINA World Aquatics Championships |
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| Venue | Palau Sant Jordi | |||||||||
| Dates | 23 July (prelims, semifinals) 24 July (final) |
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| Competitors | 167 | |||||||||
| Winning time | 48.42 seconds | |||||||||
| Medalists | ||||||||||
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The Men's 100 Freestyle event at the 10th FINA World Aquatics Championships swam on 23–24 July 2003 in Barcelona Spain. Preliminary and Semifinal heats swam on July 23; while the Final swam on July 24.
Prior to the start of the event, the existing World (WR) and Championship (CR) records were: