| Games: | World Aquatics Championships |
| Nf: | NIG |
| Nfname: | Fédération Nigérienne des Sports Nautiques |
| Year: | 2019 |
| Flagcaption: | Flag of Niger |
| Location: | Gwangju, South Korea |
| Competitors: | 3 |
| Sports: | 1 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
Niger 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.
Niger entered three swimmers.[1]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Albachir Mouctar | 100 m freestyle | 1:00.15 | 112 | did not advance | |||
| 50 m butterfly | 29.45 | 83 | did not advance | |||||
| align=left rowspan=2 | Alassane Seydou | 50 m freestyle | 25.33 | =99 | did not advance | |||
| 50 m backstroke | 30.01 | 66 | did not advance | |||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Roukaya Mahamane | 50 m freestyle | 33.71 | 94 | did not advance | |||
| 100 m freestyle | 1:21.51 | 92 | did not advance | |||||