| Games: | World Aquatics Championships |
| Nf: | BRU |
| Nfname: | Brunei Amateur Swimming Federation |
| Year: | 2019 |
| Flagcaption: | Flag of Brunei |
| Location: | Gwangju, South Korea |
| Competitors: | 2 |
| Sports: | 1 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
Brunei competed at the 2019 World Aquatics Championships in Gwangju, South Korea from 12 to 28 July.
See main article: Swimming at the 2019 World Aquatics Championships.
Brunei entered two swimmers.[1]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Muhammad Isa Ahmad | 50 m breaststroke | 30.22 | 60 | did not advance | |||
| 100 m breaststroke | 1:06.51 | 74 | did not advance | |||||
| align=left rowspan=2 | Christian Nikles | 50 m freestyle | 24.69 | 86 | did not advance | |||
| 100 m freestyle | 55.33 | 98 | did not advance | |||||