| Games: | World Aquatics Championships |
| Nf: | LAO |
| Nfname: | Laos Swimming Federation |
| Year: | 2019 |
| Flagcaption: | Flag of Laos |
| Location: | Gwangju, South Korea |
| Appearances: | auto |
| App Begin Year: | 2001 |
Laos 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.
Laos entered three swimmers.[1]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Santisouk Inthavong | 50 m freestyle | 25.79 | 109 | did not advance | |||
| 50 m backstroke | 30.75 | 67 | did not advance | |||||
| align=left rowspan=2 | Slava Sihanouvong | 50 m breaststroke | 32.11 | 64 | did not advance | |||
| 50 m butterfly | 30.40 | 88 | did not advance | |||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Siri Arun Budcharern | 50 m freestyle | 31.32 | 88 | did not advance | |||
| 50 m breaststroke | 40.72 | 48 | did not advance | |||||