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Date: 20 October 1968 / 20 October 1968 / 21 October 1968
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Douglas Russell | USA | 55.9 |
| 2 | Mark Spitz | USA | 56.4 |
| 3 | Ross Wales | USA | 57.2 |
| 4 | Vladimir Nemshilov | URS | 58.1 |
| 5 | Satoshi Maruya | JPN | 58.6 |
| 6 | Yury Suzdaltsev | URS | 58.8 |
| 7 | Lutz Stocklasa | FRG | 58.9 |
| 8 | Robert Cusack | AUS | 59.8 |
| Semi-finals | |||
| 9 | John Jackson | GBR | 59.3 |
| 10 | Martyn Woodroffe | GBR | 59.5 |
| 11 | Toomas Arusoo | CAN | 59.6 |
| 11 | Abraham Melamed | ISR | 59.6 |
| 13 | Yasuo Takada | JPN | 59.8 |
| 14 | Karl Eriksson | SWE | 59.9 |
| 14 | Werner Freitag | FRG | 59.9 |
| 14 | Bo Westergren | SWE | 59.9 |
| 17 | Gary Goodner | PUR | 1:00.1 |
| 18 | Antonio Attanasio | ITA | 1:00.3 |
| 19 | Ronald Jacks | CAN | 1:00.5 |
| 20 | Angelo Tozzi | ITA | 1:00.8 |
| 21 | Jose Ferriouli | PUR | 1:00.9 |
| 22 | John Thurley | GBR | 1:01.2 |
| 23 | Luis Alberto Nicolao | ARG | |
| 23 | Arturo Lang Lenton | ESP | |
| Heats | |||
| 25 | Horst-Gunter Gregor | GDR | 59.8 |
| 26 | Sergei Konov | URS | 1:00.8 |
| 27 | Eduardo Orejuela | ECU | 1:00.9 |
| 27 | Aris Caperonis | SUI | 1:00.9 |
| 29 | Istvan Szentirmay | HUN | 1:01.0 |
| 30 | Graham Dunn | AUS | 1:01.6 |
| 31 | Mario Santibanez | MEX | 1:01.7 |
| 31 | Giampiero Fossati | ITA | 1:01.7 |
| 33 | Leroy Goff | PHI | 1:02.0 |
| 34 | Joseph Meyten | BEL | 1:02.2 |
| 34 | Tomas Becerra | COL | 1:02.2 |
| 36 | Lars Feil | SWE | 1:02.3 |
| 36 | Joao Costa | BRA | 1:02.3 |
| 38 | Donnacha O'Dea | IRL | 1:02.8 |
| 39 | Ramiro Benavides | GUA | 1:03.1 |
| 40 | Gudmundur Gislason | ISL | 1:03.3 |
| 41 | Maxmiliano Aguilar | MEX | 1:04.0 |
| 42 | Lee Tong-Shing | TPE | 1:05.2 |
| 43 | Salvador Vilanova | ESA | 1:06.4 |
| 44 | Andrew Loh | HKG | 1:06.5 |
| 44 | Robert Loh | HKG | 1:06.5 |
| 46 | Ruben Guerrero | ESA | 1:10.1 |
| 47 | Friedrich Jokisch | ESA | 1:10.5 |
| Did not start | |||
| Geoffrey Ferreira | TTO | ||
| Laszlo Cseh | HUN | ||