Swimming at the 2008 Summer Olympics – Men's 100 metre freestyle Semifinal 1 Semifinal 1

| Rank_ | Lane | Name_ | Nationality | Time_ |
|---|---|---|---|---|
| 1 | 5 | Alain Bernard | France | 47.20 |
| 2 | 4 | Stefan Nystrand | Sweden | 47.91 |
| 3 | 2 | Jason Lezak | United States | 47.98 |
| 4 | 6 | Lyndon Ferns | South Africa | 48.00 |
| 5 | 3 | César Cielo Filho | Brazil | 48.07 |
| 6 | 8 | Christian Galenda | Italy | 48.47 |
| 7 | 1 | Jonas Persson | Sweden | 48.59 |
| 8 | 7 | Fabien Gilot | France | 49.00 |