| Games: | World Aquatics Championships |
| Nf: | MAD |
| Nfname: | Fédération Malgache de Natation |
| Year: | 2019 |
| Flagcaption: | Flag of Madagascar |
| Location: | Gwangju, South Korea |
| Competitors: | 4 |
| Sports: | 1 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
Madagascar 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.
Madagascar entered four swimmers.[1]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Jonathan Raharvel | 50 m breaststroke | 30.23 | =61 | did not advance | |||
| 100 m breaststroke | 1:06.53 | 75 | did not advance | |||||
| align=left rowspan=2 | Heriniavo Rasolonjatovo | 100 m freestyle | 55.22 | 96 | did not advance | |||
| 100 m backstroke | 1:00.87 | 58 | did not advance | |||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Tiana Rabarijaona | 200 m freestyle | 2:10.21 | 44 | did not advance | |||
| 400 m freestyle | 4:36.73 | 39 | did not advance | |||||
| align=left rowspan=2 | Idealy Tendrinavalona | 100 m backstroke | 1:08.41 | 55 | did not advance | |||
| 200 m backstroke | 2:29.80 | 42 | did not advance | |||||
| Athlete | Event | Heat | Final | |||
|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Idealy Tendrinavalona Jonathan Raharvel Heriniavo Rasolonjatovo Tiana Rabarijaona | 4 × 100 m mixed freestyle relay | 4:02.46 | 32 | did not advance | |
| 4 × 100 m mixed medley relay | 4:18.34 | 28 | did not advance | |||