Swimming at the 2016 Summer Paralympics – Men's 50 metre freestyle S3
The Men's 50 metre freestyle S3 event at the 2016 Paralympic Games took place on 13 September 2016, at the Olympic Aquatics Stadium. Two heats were held. The swimmers with the eight fastest times advanced to the final.Heats
11:42 13 September 2016:
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | | | 47.03 | ' |
| 2 | 4 | | | 50.55 | ' |
| 3 | 6 | | | 52.26 | ' |
| 4 | 3 | | | 55.45 | ' |
| 5 | 2 | | | 58.17 | |
Heat 2
11:46 13 September 2016:
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | | | 40.51 | ' ' |
| 2 | 5 | | | 42.92 | ' |
| 3 | 3 | | | 46.95 | ' |
| 4 | 6 | | | 51.09 | |
| 5 | 2 | | | 1:02.10 | |
| 6 | 7 | | | 1:38.21 | |
Final
20:22 13 September 2016:
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | | | 39.24 | |
| 5 | | | 41.41 | |
| 2 | | | 42.18 | |
| 4 | 3 | | | 45.62 | |
| 5 | 6 | | | 47.32 | |
| 6 | 7 | | | 50.90 | |
| 7 | 8 | | | 53.95 | |
| 8 | 1 | | | 55.74 | |
