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Date: 20 October 1968
Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Mark Spitz | USA | 57.4 |
| 2 | Lutz Stocklasa | FRG | 58.5 |
| 3 | John Jackson | GBR | 59.3 |
| 4 | Abraham Melamed | ISR | 59.6 |
| 5 | Werner Freitag | FRG | 59.9 |
| 6 | Bo Westergren | SWE | 59.9 |
| 7 | Jose Ferriouli | PUR | 1:00.9 |
| 8 | John Thurley | GBR | 1:01.2 |
| Rank | Name | Nation | Time |
| 1 | Satoshi Maruya | JPN | 58.0 |
| 2 | Vladimir Nemshilov | URS | 59.0 |
| 3 | Martyn Woodroffe | GBR | 59.5 |
| 4 | Toomas Arusoo | CAN | 59.6 |
| 5 | Karl Eriksson | SWE | 59.9 |
| 6 | Antonio Attanasio | ITA | 1:00.3 |
| 7 | Ronald Jacks | CAN | 1:00.5 |
| Did not start | |||
| Luis Alberto Nicolao | ARG | ||
| Rank | Name | Nation | Time |
| 1 | Douglas Russell | USA | 55.9 |
| 2 | Ross Wales | USA | 58.2 |
| 3 | Yury Suzdaltsev | URS | 58.9 |
| 4 | Robert Cusack | AUS | 59.2 |
| 5 | Yasuo Takada | JPN | 59.8 |
| 6 | Gary Goodner | PUR | 1:00.1 |
| 7 | Angelo Tozzi | ITA | 1:00.8 |
| Did not start | |||
| Arturo Lang Lenton | ESP | ||