| Event: | Swimming – Men's 100 metre backstroke |
| Games: | 2015 |
| Venue: | OCBC Aquatic Centre, Singapore Sports Hub |
| Dates: | 6 June 2015 |
| Competitors: | 11 |
| Nations: | 8 |
| Gold: | Quah Zheng Wen |
| Goldseagf: | SIN |
| Silver: | I Gede Siman Sudartawa |
| Silverseagf: | INA |
| Bronze: | Trần Duy Khôi |
| Bronzeseagf: | VIE |
| Prev: | 2013 |
| Next: | 2017 |
The Men's 100 metre backstroke event at the 2015 SEA Games took place on 6 June 2015 at the OCBC Aquatic Centre in the Singapore Sports Hub.
There were 11 competitors from eight countries who took part in this event. Two heats were held. The heat in which a swimmer competed did not formally matter for advancement, as the swimmers with the top eight times from both field qualified for the finals.
All times are Singapore Standard Time
| width=220 | Date | width=50 | Time | width=100 | Event |
|---|---|---|---|---|---|
| Saturday, 6 June 2015 | 09:16 | Heats | |||
| 19:49 | Final |
The following records were established during the competition:
| width=40 | Rank | width=40 | Heat | width=40 | Lane | width=250 | Athlete | width=80 | Time | width=50 | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 4 | 58.11 | Q | |||||||
| 2 | 2 | 5 | 58.24 | Q | |||||||
| 3 | 2 | 3 | 58.25 | Q | |||||||
| 4 | 1 | 4 | 58.84 | Q | |||||||
| 5 | 1 | 5 | 58.95 | Q | |||||||
| 6 | 1 | 3 | 59.02 | Q | |||||||
| 7 | 2 | 2 | 59.04 | Q | |||||||
| 8 | 2 | 6 | 59.45 | Q | |||||||
| 9 | 1 | 6 | 1:00.29 | ||||||||
| 10 | 1 | 2 | 1:09.86 | ||||||||
| 11 | 2 | 7 | 1:12.47 |
| width=40 | Rank | width=40 | Lane | width=250 | Athlete | width=80 | Time | width=50 | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 6 | 54.51 | GR | |||||||
| 4 | 55.60 | ||||||||
| 5 | 56.31 | ||||||||
| 4 | 3 | 57.28 | |||||||
| 5 | 7 | 57.30 | |||||||
| 6 | 1 | 57.48 | NR | ||||||
| 7 | 2 | 57.71 | |||||||
| 8 | 8 | 59.83 |