| Games: | World Aquatics Championships |
| Nf: | TGA |
| Nfname: | Tonga Swimming Association |
| Year: | 2019 |
| Flagcaption: | Flag of Tonga |
| Location: | Gwangju, South Korea |
| Competitors: | 4 |
| Sports: | 1 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
| App Begin Year: | 2011 |
Tonga 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.
Tonga entered four swimmers.[1]
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Amini Fonua | 50 m breaststroke | 29.73 | 56 | did not advance | |||
| 100 m breaststroke | 1:08.32 | 81 | did not advance | |||||
| align=left rowspan=2 | Finau Ohuafi | 50 m freestyle | 25.32 | 98 | did not advance | |||
| 100 m freestyle | 57.45 | 106 | did not advance | |||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Noelani Day | 50 m freestyle | 28.67 | 67 | did not advance | |||
| 50 m backstroke | 35.17 | 43 | did not advance | |||||
| align=left rowspan=2 | Charissa Panuve | 100 m freestyle | 1:08.00 | 84 | did not advance | |||
| 200 m freestyle | 2:33.31 | 61 | did not advance | |||||
| Athlete | Event | Heat | Final | |||
|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | |||
| Finau Ohuafi Noelani Day Charissa Panuve Amini Fonua | 4×100 m freestyle relay | 4:08.19 | 34 | did not advance | ||
| Finau Ohuafi Amini Fonua Charissa Panuve Noelani Day | 4×100 m medley relay | 4:39.91 | 34 | did not advance | ||