Swimming at the 1968 Summer Olympics – Men's 100 metre butterfly
The men's 100 metre butterfly event at the 1968 Olympic Games took place between 20 and 21 October. This swimming event used the butterfly stroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.Medalists
Results
Heats
Heat 1
| Rank | Athlete | Country | Time | Note |
| 1 | Doug Russell | | 57.3 | |
| 2 | Vladimir Nemshilov | | 59.1 | |
| 3 | Antonio Attanasio | | 1:00.0 | |
| 4 | John Thurley | | 1:00.7 | |
| 5 | Ayis Capéronis | | 1:00.9 | |
| 6 | Joseph Meyten | | 1:02.2 | |
| 7 | Andrew Loh | | 1:06.5 | |
Heat 2
| Rank | Athlete | Country | Time | Note |
| 1 | Joseph Jackson | | 59.7 | |
| 2 | Gary Goodner | | 1:00.3 | |
| 3 | Ron Jacks | | 1:00.5 | |
| 4 | Sergey Konov | | 1:00.8 | |
| 5 | João Lima Neto | | 1:02.3 | |
| 6 | Ramiro Benavides | | 1:03.1 | |
Heat 3
| Rank | Athlete | Country | Time | Note |
| 1 | Ross Wales | | 58.7 | |
| 2 | Yury Suzdaltsev | | 59.3 | |
| 3 | Avraham Melamed | | 59.4 | |
| 4 | Horst-Günter Gregor | | 59.8 | |
| 5 | István Szentirmay | | 1:01.0 | |
| 6 | Leroy Goff | | 1:02.0 | |
| 7 | Salvador Vilanova | | 1:06.4 | |
Heat 4
| Rank | Athlete | Country | Time | Note |
| 1 | Satoshi Maruya | | 58.1 | |
| 2 | Martyn Woodroffe | | 59.7 | |
| 3 | Werner Freitag | | 1:00.1 | |
| 4 | Graham Dunn | | 1:01.6 | |
| 5 | Donnacha O'Dea | | 1:02.8 | |
| 6 | Gudmunður Gíslason | | 1:03.3 | |
| 7 | Friedrich Jokisch | | 1:10.5 | |
Heat 5
| Rank | Athlete | Country | Time | Note |
| 1 | Mark Spitz | | 58.5 | |
| 2 | Yasuo Takada | | 1:00.0 | |
| 3 | José Ferraioli | | 1:00.6 | |
| 4 | Angelo Tozzi | | 1:00.6 | |
| 5 | Ingvar Eriksson | | 1:00.6 | |
| 6 | Tomas Becerra | | 1:02.2 | |
| 7 | Bob Loh | | 1:06.5 | |
Heat 6
| Rank | Athlete | Country | Time | Note |
| 1 | Lutz Stoklasa | | 59.2 | |
| 2 | Robert Cusack | | 59.6 | |
| 3 | Tom Arusoo | | 59.8 | |
| 4 | Mario Santibáñez | | 1:01.7 | |
| 5 | Peter Feil | | 1:02.3 | |
| 6 | Maximiliano Aguilar | | 1:04.0 | |
| 7 | Rubén Guerrero | | 1:10.1 | |
Heat 7
| Rank | Athlete | Country | Time | Note |
| 1 | Luis Nicolao | | 59.3 | |
| 2 | Bo Westergren | | 59.9 | |
| 3 | Arturo Lang-Lenton | | 1:00.7 | |
| 4 | Eduardo Orejuela | | 1:00.9 | |
| 5 | Giampiero Fossati | | 1:01.7 | |
| 6 | Lee Tong-shing | | 1:05.2 | |
Semifinals
Semifinals 1
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | | Mark Spitz | | 57.4 | |
| 2 | | Lutz Stoklasa | | 58.5 | |
| 3 | | Joseph Jackson | | 59.3 | |
| 4 | | Avraham Melamed | | 59.6 | |
| 5 | | Werner Freitag | | 59.9 | Q |
| 6 | | Bo Westergren | | 59.9 | |
| 7 | | José Ferraioli | | 1:00.9 | |
| 8 | | John Thurley | | 1:00.2 | |
Semifinals 2
Semifinals 3
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | | Doug Russell | | 55.9 | |
| 2 | | Ross Wales | | 58.2 | |
| 3 | | Yury Suzdaltsev | | 58.9 | |
| 4 | | Robert Cusack | | 58.2 | |
| 5 | | Yasuo Takada | | 59.8 | |
| 6 | | Gary Goodner | | 1.00.1 | Q |
| 7 | | Angelo Tozzi | | 1:00.8 | |
Final
| Rank | Athlete | Country | Time | Notes |
| Doug Russell | | 55.9 | OR |
| Mark Spitz | | 56.4 | |
| Ross Wales | | 57.2 | |
| 4 | Vladimir Nemshilov | | 58.1 | |
| 5 | Satoshi Maruya | | 58.6 | |
| 6 | Yury Suzdaltsev | | 58.8 | |
| 7 | Lutz Stocklasa | | 58.9 | |
| 8 | Robert Cusack | | 59.8 | |
Key: OR = Olympic record
