| Games: | World Aquatics Championships |
| Nf: | BRU |
| Nfname: | Brunei Swimming Federation |
| Year: | 2013 |
| Flagcaption: | Flag of Brunei |
| Location: | Barcelona, Spain |
| Competitors: | 4 |
| Sports: | 1 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
| App Begin Year: | 2009 |
Brunei competed at the 2013 World Aquatics Championships in Barcelona, Spain between 19 July and 4 August 2013.
See main article: Swimming at the 2013 World Aquatics Championships. Swimmers from Brunei achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard entry time, and 1 at the B-standard):[1] [2]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Muhammad Isa Ahmad | 50 m breaststroke | 31.68 | 66 | did not advance | |||
| 100 m breaststroke | 1:09.96 | 68 | did not advance | |||||
| align=left rowspan=2 | Christian Nikles | 50 m freestyle | 25.52 | 71 | did not advance | |||
| 100 m freestyle | 55.55 | 72 | did not advance | |||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Nur Hamizah Ahmad | 50 m backstroke | 33.85 | 48 | did not advance | |||
| 100 m backstroke | 1:13.25 | 48 | did not advance | |||||
| align=left rowspan=2 | Tiara Shahril | 50 m freestyle | 28.74 | 61 | did not advance | |||
| 100 m freestyle | 1:02.88 | 62 | did not advance | |||||