# Swimming at the 1976 Summer Olympics – Men's 100 metre butterfly

The men's 100 metre butterfly event for the 1976 Summer Olympics was held in Montreal. The event took place on 20 and 21 July.

## Heats

Heat 1
| Rank | Athlete | Country | Time | Notes |
| 1 | Yevgeny Seredin | Soviet Union | 56.95 | Q |
| 2 | Bruce Robertson | Canada | 57.06 | Q |
| 3 | Pär Arvidsson | Sweden | 57.17 | Q |
| 4 | Cees Vervoorn | Netherlands | 57.84 | |
| 5 | Rômulo Arantes Filho | Brazil | 58.80 | |
| 6 | Adi Prag | Israel | 59.99 | |
| - | François Deley | Belgium | - | DQ |
Heat 2
| Rank | Athlete | Country | Time | Notes |
| 1 | Jorge Delgado, Jr. | Ecuador | 56.79 | Q |
| 2 | Neil Rogers | Australia | 57.08 | Q |
| 3 | Miloslav Roľko | Czechoslovakia | 57.79 | |
| 4T | Serge Buttet | France | 58.37 | |
| 4T | Arnaldo Pérez | Puerto Rico | 58.37 | |
| 6 | Riccardo Urbani | Italy | 58.83 | |
| 7 | Carlos González | Panama | 1:00.97 | |
Heat 3
| Rank | Athlete | Country | Time | Notes |
| 1 | Roger Pyttel | East Germany | 55.25 | Q |
| 2 | Klaus Steinbach | West Germany | 56.10 | Q |
| 3 | Hideaki Hara | Japan | 56.57 | Q |
| 4 | Jorge Jaramillo | Colombia | 57.33 | |
| 5 | Jon Jon Park | Great Britain | 57.42 | |
| 6 | Campari Knoepffler | Nicaragua | 1:02.05 | |
Heat 4
| Rank | Athlete | Country | Time | Notes |
| 1 | Matt Vogel | United States | 55.40 | Q |
| 2 | Clay Evans | Canada | 55.65 | Q |
| 3 | Peter Broscienski | West Germany | 57.15 | Q |
| 4T | Paolo Barelli | Italy | 57.64 | |
| 4T | Oleksandr Manachynskiy | Soviet Union | 57.64 | |
| 6 | José Luis Prado | Mexico | 59.16 | |
| 7 | Paulo Frischknecht | Portugal | 1:01.97 | |
| 8 | Lawrence Kwoh | Hong Kong | 1:02.47 | |
Heat 5
| Rank | Athlete | Country | Time | Notes |
| 1 | Gary Hall | United States | 55.35 | Q |
| 2 | John Mills | Great Britain | 56.53 | Q |
| 3 | Steve Pickell | Canada | 56.59 | Q |
| 4 | John Coutts | New Zealand | 57.29 | |
| 5 | Hartmut Flöckner | East Germany | 57.66 | |
| 6 | Luis Goicoechea | Venezuela | 57.92 | |
| 7 | John Daly | Puerto Rico | 58.04 | |
| 8 | Steven Newkirk | Virgin Islands | 1:01.46 | |
Heat 6
| Rank | Athlete | Country | Time | Notes |
| 1 | Joe Bottom | United States | 56.26 | Q |
| 2 | Roland Matthes | East Germany | 56.41 | Q |
| 3 | Michael Kraus | West Germany | 57.22 | |
| 4 | Ross Seymour | Australia | 57.74 | |
| 5 | Richard Iredale | Great Britain | 58.50 | |
| 6 | Shinsuke Kayama | Japan | 58.55 | |
| 7 | Konstantinos Koskinas | Greece | 1:00.20 | |
| 8 | Robert Howard | Ireland | 1:00.92 | |

## Semifinals

Heat 1
| Rank | Athlete | Country | Time | Notes |
| 1 | Joe Bottom | United States | 55.26 | Q |
| 2 | Gary Hall | United States | 55.32 | Q |
| 3 | Neil Rogers | Australia | 55.72 | Q |
| 4 | Clay Evans | Canada | 55.86 | Q |
| 5 | John Mills | Great Britain | 56.54 | |
| 6 | Steve Pickell | Canada | 56.66 | |
| 7 | Pär Arvidsson | Sweden | 56.93 | |
| 8 | Yevgeny Seredin | Soviet Union | 57.46 | |
Heat 2
| Rank | Athlete | Country | Time | Notes |
| 1 | Roger Pyttel | East Germany | 54.75 | Q |
| 2 | Matt Vogel | United States | 54.80 | Q |
| 3 | Roland Matthes | East Germany | 55.88 | Q |
| 4 | Klaus Steinbach | West Germany | 55.90 | Q |
| 5 | Hideaki Hara | Japan | 56.52 | |
| 6 | Bruce Robertson | Canada | 56.72 | |
| 7 | Peter Broscienski | West Germany | 56.81 | |
| 8 | Jorge Delgado, Jr. | Ecuador | 56.91 | |

## Final

| Rank | Athlete | Country | Time |
| | Matt Vogel | United States | 54.35 |
| | Joe Bottom | United States | 54.50 |
| | Gary Hall | United States | 54.65 |
| 4 | Roger Pyttel | East Germany | 55.09 |
| 5 | Roland Matthes | East Germany | 55.11 |
| 6 | Clay Evans | Canada | 55.81 |
| 7 | Hideaki Hara | Japan | 56.34 |
| 8 | Neil Rogers | Australia | 56.57 |