| Event: | Men's 100 metre butterfly S8 |
| Games: | 2008 Summer |
| Venue: | Beijing National Aquatics Center |
| Dates: | September 7 |
| Competitors: | 14 |
| Nations: | 9 |
| Gold: | Peter Leek |
| Goldnpc: | AUS |
| Silver: | Wei Yanpeng |
| Silvernpc: | CHN |
| Bronze: | Wang Xiaofu |
| Bronzenpc: | CHN |
The men's 100 metre butterfly S8 event at the 2008 Paralympic Games took place on September 7, at the Beijing National Aquatics Center.
Two heats were held, with seven swimmers in each heat. The swimmers with the eight fastest times advanced to the final; there, they all competed in a single final heat to earn final placements.
| Rank | Lane | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 4 | Peter Leek | 1:01.01 | ||
| 2 | 5 | Wang Jianchiao | 1:03.27 | ||
| 3 | 6 | Mikhail Sidnin | 1:08.47 | ||
| 4 | 3 | Konstantin Lisenkov | 1:09.66 | ||
| 5 | 7 | Alejandro Sánchez | 1:10.18 | ||
| 6 | 1 | Rudy Garcia Tolson | 1:12.99 | ||
| 7 | 2 | Nikolai Willig | 1:13.39 | ||
| Rank | Lane | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 3 | Wei Yanpeng | 1:01.76 | ||
| 2 | 4 | Wang Xiaofu | 1:03.25 | ||
| 3 | 5 | Ben Austin | 1:04.83 | ||
| 4 | 7 | Drew Christensen | 1:06.98 | ||
| 5 | 6 | Sean Fraser | 1:07.42 | ||
| 6 | 2 | Ferenc Csuri | 1:07.96 | ||
| 7 | 1 | Evgeny Zimin | 1:13.50 | ||
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 | 1:00.95 | |||||
| 5 | 1:01.49 | |||||
| 3 | 1:01.68 | |||||
| 4 | 6 | 1:03.01 | ||||
| 5 | 2 | 1:03.50 | ||||
| 6 | 7 | 1:07.74 | ||||
| 7 | 8 | 1:08.17 | ||||
| 8 | 1 | 1:08.36 |