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

| Rank_ | Lane | Name_ | Nationality | Time_ |
|---|---|---|---|---|
| 1 | 4 | Kosuke Kitajima | Japan | 59.55 |
| 2 | 5 | Brenton Rickard | Australia | 59.65 |
| 3 | 8 | Mark Gangloff | United States | 1:00.44 |
| 4 | 6 | Igor Borysik | Ukraine | 1:00.55 |
| 5 | 7 | Oleg Lisogor | Ukraine | 1:00.56 |
| 6 | 1 | Mihail Alexandrov | Bulgaria | 1:00.61 |
| 7 | 3 | Giedrius Titenis | Lithuania | 1:00.66 |
| 8 | 2 | Christian Sprenger | Australia | 1:00.76 |