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

| Rank_ | Lane | Name_ | Nationality | Time_ |
|---|---|---|---|---|
| 1 | 4 | Arkady Vyatchanin | Russia | 53.06 |
| 2 | 5 | Aschwin Wildeboer Faber | Spain | 53.51 |
| 3 | 3 | Liam Tancock | Great Britain | 53.61 |
| 4 | 2 | Junichi Miyashita | Japan | 53.69 |
| 5 | 7 | Tomomi Morita | Japan | 53.95 |
| 6 | 8 | Gregor Tait | Great Britain | 54.37 |
| 7 | 6 | Ľuboš Križko | Slovakia | 54.38 |
| 8 | 1 | Mirco Di Tora | Italy | 54.92 |