# Swimming at the 1968 Summer Olympics – Men's 100 metre breaststroke

The men's 100 metre breaststroke event at the 1968 Summer Olympics took place between 18 and 19 October in the Alberca Olímpica Francisco Márquez. This swimming event used the breaststroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.

## Medalists

| Gold | Don McKenzie United States |
| Silver | Vladimir Kosinsky Soviet Union |
| Bronze | Nikolai Pankin Soviet Union |

## Results
### Heats

Heat 1
| Rank | Athlete | Country | Time |
| 1 | Nikolay Pankin | Soviet Union | 1:08.9 |
| 2 | Klaus Katzur | East Germany | 1:09.4 |
| 3 | Dave Perkowski | United States | 1:09.5 |
| 4 | Michael Günther | West Germany | 1:10.3 |
| 5 | Osamu Tsurumine | Japan | 1:10.5 |
| 6 | Nicolas Gilliard | Switzerland | 1:12.8 |
| 7 | Eduardo Moreno | Mexico | 1:13.7 |
Heat 2
| Rank | Athlete | Country | Time |
| 1 | Nobutaka Taguchi | Japan | 1:09.8 |
| 2 | Vladimir Kosinsky | Soviet Union | 1:10.0 |
| 3 | Ken Merten | United States | 1:10.6 |
| 4 | Liam Ball | Ireland | 1:12.1 |
| 5 | Leiknir Jónsson | Iceland | 1:16.3 |
| 6 | Abel Muñoz | El Salvador | 1:19.4 |
Heat 3
| Rank | Athlete | Country | Time |
| 1 | Egon Henninger | East Germany | 1:09.6 |
| 2 | Ladislau Koszta | Romania | 1:10.1 |
| 3 | Józef Klukowski | Poland | 1:11.0 |
| 4 | Thomas Aretz | West Germany | 1:11.1 |
| 5 | Sándor Szabó | Hungary | 1:11.3 |
| 6 | Stuart Roberts | Great Britain | 1:12.7 |
| 7 | Ivan Gomina | Colombia | 1:15.1 |
Heat 4
| Rank | Athlete | Country | Time |
| 1 | José Sylvio Fiolo | Brazil | 1:09.5 |
| 2 | Gregor Betz | West Germany | 1:10.3 |
| 3 | Amman Jalmaani | Philippines | 1:10.6 |
| 4 | Slavko Kurbanović | Yugoslavia | 1:11.6 |
| 5 | Roger Roberts | Great Britain | 1:11.7 |
| 6 | Leroy Goff | Philippines | 1:13.7 |
| 7 | Arturo Carranza | El Salvador | 1:28.0 |
Heat 5
| Rank | Athlete | Country | Time |
| 1 | Don McKenzie | United States | 1:08.1 |
| 2 | Yevhen Mykhailov | Soviet Union | 1:09.3 |
| 3 | Bill Mahony | Canada | 1:09.7 |
| 4 | Osvaldo Boretto | Argentina | 1:10.3 |
| 5 | Felipe Muñoz | Mexico | 1:10.6 |
| 6 | Yohan Kende | Israel | 1:12.3 |
Heat 6
| Rank | Athlete | Country | Time |
| 1 | Ian O'Brien | Australia | 1:08.9 |
| 2 | Alberto Forelli | Argentina | 1:09.3 |
| 3 | Thomas Johnsson | Sweden | 1:10.0 |
| 4 | José Durán | Spain | 1:12.3 |
| 5 | Javier Jiménez | Mexico | 1:16.3 |
| 6 | Eduardo Ramos | El Salvador | 1:31.2 |

### Semifinals
#### Heat Two

| Rank | Athlete | Country | Time | Notes |
| 1 | Nikolay Pankin | Soviet Union | 1:08.1 | |
| 2 | Alberto Forelli | Argentina | 1:08.9 | |
| 3 | Dave Perkowski | United States | 1:09.0 | |
| 4 | Felipe Muñoz | Mexico | 1:09.4 | |
| 5 | Ladislau Koszta | Romania | 1:09.8 | |
| 6 | Thomas Aretz | West Germany | 1:11.2 | |
| 7 | Osvaldo Boretto | Argentina | 1:11.8 | |
| 8 | Nobutaka Taguchi | Japan | | DQ |

#### Heat Three

| Rank | Athlete | Country | Time | Notes |
| 1 | Vladimir Kosinsky | Soviet Union | 1:07.9 | |
| 2 | Don McKenzie | United States | 1:08.1 | |
| 3 | José Sylvio Fiolo | Brazil | 1:08.6 | |
| 4 | Yevhen Mykhailov | Soviet Union | 1:08.8 | |
| 5 | Bill Mahony | Canada | 1:09.7 | |
| 6 | Gregor Betz | West Germany | 1:09.8 | |
| 7 | Józef Klukowski | Poland | 1:10.9 | |
| 8 | Ken Merten | United States | 1:11.6 | ' |

### Final

| Rank | Athlete | Country | Time | Notes |
| | Don McKenzie | United States | 1:07.7 | OR |
| | Vladimir Kosinsky | Soviet Union | 1:08.0 | |
| | Nikolai Pankin | Soviet Union | 1:08.0 | |
| 4 | José Sylvio Fiolo | Brazil | 1:08.1 | |
| 5 | Yevgeny Mikhaylov | Soviet Union | 1:08.4 | |
| 6 | Ian O'Brien | Australia | 1:08.6 | |
| 7 | Alberto Forelli | Argentina | 1:08.7 | |
| 8 | Egon Henninger | East Germany | 1:09.7 | |
Key: OR = Olympic record