| Games: | World Aquatics Championships |
| Nf: | LUX |
| Nfname: | Luxembourg Swimming and Rescue Federation |
| Year: | 2019 |
| Flagcaption: | Flag of Luxembourg |
| Location: | Gwangju, South Korea |
| Appearances: | auto |
Luxembourg competed at the 2019 World Aquatics Championships in Gwangju, South Korea from 12 to 28 July.
See main article: High diving at the 2019 World Aquatics Championships. Luxembourg qualified one male high diver.[1]
See main article: Swimming at the 2019 World Aquatics Championships.
Luxembourg entered five swimmers.[2]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Pit Brandenburger | 200 m freestyle | 1:50.10 | 38 | did not advance | |||
| 800 m freestyle | 8:23.99 | 35 | did not advance | |||||
| align=left rowspan=3 | Julien Henx | 50 m freestyle | 22.71 | 42 | did not advance | |||
| 100 m freestyle | 50.43 | 52 | did not advance | |||||
| 50 m butterfly | 23.91 | =28 | did not advance | |||||
| align=left rowspan=2 | Raphaël Stacchiotti | 200 m individual medley | 1:59.62 | 14 Q | 2:00.26 | 16 | did not advance | |
| 400 m individual medley | 4:27.80 | 28 | did not advance | |||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Julie Meynen | 50 m freestyle | 25.07 | 16 Q | 24.78 | 12 | did not advance | |
| 100 m freestyle | 54.44 | 17 | did not advance | |||||
| align=left rowspan=2 | Monique Olivier | 200 m freestyle | 2:01.96 | 28 | did not advance | |||
| 400 m freestyle | 4:14.29 | 22 | did not advance | |||||