| Event: | Swimming – Men's 50 metre backstroke |
| Games: | 2017 |
| Venue: | National Aquatic Centre |
| Date: | 21 August 2017 |
| Competitors: | 12 |
| Nations: | 6 |
| Gold: | I Gede Siman Sudartawa |
| Goldseagf: | INA |
| Silver: | Quah Zheng Wen |
| Silverseagf: | SGP |
| Bronze: | Lê Nguyễn Paul |
| Bronzeseagf: | VIE |
| Prev: | 2015 |
| Next: | 2019 |
See main article: Swimming at the 2017 SEA Games.
The men's 50 metre backstroke competition of the swimming event at the 2017 SEA Games was held on 21 August at the National Aquatic Centre in Kuala Lumpur, Malaysia.
The following records were established during the competition:
All times are Malaysia Standard Time
| Date | Time | Event |
|---|---|---|
| Monday, 21 August 2017 | 09:00 | Heat 1 |
| 09:00 | Heat 2 | |
| 19:00 | Final |
The heats were held on 21 August.
| width=40 | Rank | width=40 | Lane | width=250 | Athletes | width=80 | Time | width=50 | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 7 | 25.91 | Q | ||||||
| 2 | 5 | 26.30 | Q | ||||||
| 3 | 4 | 26.39 | Q | ||||||
| 4 | 3 | 26.62 | Q | ||||||
| 5 | 6 | 31.26 | |||||||
| 6 | 2 | 32.52 |
| width=40 | Rank | width=40 | Lane | width=250 | Athletes | width=80 | Time | width=50 | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 4 | 25.53 | Q | ||||||
| 3 | 7 | 25.75 | Q | ||||||
| 2 | 5 | 26.49 | Q | ||||||
| 4 | 3 | 26.77 | Q | ||||||
| 5 | 6 | 27.61 | |||||||
| 6 | 2 | 30.50 |
The final was held on 21 August.
| width=40 | Rank | width=40 | Lane | width=250 | Athletes | width=80 | Time | width=50 | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 4 | 25.20 | GR | |||||||
| 3 | 25.39 | ||||||||
| 5 | 25.82 | ||||||||
| 4 | 6 | 25.90 | |||||||
| 5 | 2 | 26.10 | |||||||
| 6 | 7 | 26.26 | |||||||
| 7 | 1 | 26.38 | |||||||
| 8 | 8 | 26.49 |