| Event: | Men's 100 metre breaststroke |
| Games: | 1980 Summer |
| Venue: | Swimming Pool at the Olimpiysky Sports Complex |
| Date: | 21 July (heats) 22 July (final) |
| Competitors: | 26 |
| Nations: | 20 |
| Win Value: | 1:03.34 |
| Gold: | Duncan Goodhew |
| Goldnoc: | GBR |
| Silver: | Arsens Miskarovs |
| Silvernoc: | URS |
| Bronze: | Peter Evans |
| Bronzenoc: | AUS |
| Prev: | 1976 |
| Next: | 1984 |
The men's 100 metre breaststroke event at the 1980 Summer Olympics in Moscow was held on 21 and 22 July at the Swimming Pool at the Olimpiysky Sports Complex.[1]
Prior to this competition, the existing world and Olympic records were as follows.
| Rank | Heat | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 4 | 1:03.48 | Q | ||
| 2 | 3 | 1:03.86 | Q | ||
| 3 | 3 | 1:04.06 | Q | ||
| 4 | 2 | 1:04.55 | Q | ||
| 4 | 2 | 1:04.55 | Q | ||
| 6 | 2 | 1:04.78 | Q | ||
| 7 | 3 | 1:05.23 | Q | ||
| 8 | 2 | 1:05.38 | Q | ||
| 9 | 1 | 1:05.43 | |||
| 10 | 4 | 1:05.67 | |||
| 11 | 4 | 1:06.12 | |||
| 12 | 1 | 1:06.13 | |||
| 13 | 1 | 1:06.23 | |||
| 14 | 4 | 1:06.43 | |||
| 15 | 3 | 1:06.47 | |||
| 16 | 3 | 1:06.71 | |||
| 17 | 1 | 1:06.77 | |||
| 18 | 4 | 1:06.81 | |||
| 19 | 3 | 1:07.06 | |||
| 20 | 4 | 1:07.45 | |||
| 21 | 2 | 1:10.07 | |||
| 22 | 1 | 1:13.62 | |||
| 23 | 3 | 1:18.95 | |||
| 24 | 1 | 1:21.42 | |||
| 25 | 2 | 1:25.70 | |||
| 1 | DSQ | ||||
| 2 | DNS | ||||
| 4 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 1:03.34 | |||||
| 1:03.82 | |||||
| 1:03.96 | |||||
| 4 | 1:04.00 | ||||
| 5 | 1:04.67 | ||||
| 6 | 1:05.04 | ||||
| 7 | 1:05.91 | ||||
| DSQ |