| Games: | World Aquatics Championships |
| Nf: | VIE |
| Nfname: | Vietnam Aquatic Sports Association |
| Year: | 2013 |
| Flagcaption: | Flag of Vietnam |
| Location: | Barcelona, Spain |
| Competitors: | 3 |
| Sports: | 1 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
| App Begin Year: | 2011 |
Vietnam is competing at the 2013 World Aquatics Championships in Barcelona, Spain between 19 July and 4 August 2013.
See main article: Swimming at the 2013 World Aquatics Championships.
Vietnam qualified there quota places for the following swimming events.[1]
| Athlete | Event | Heat | Semifinal | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| align=left rowspan=2 | Pham Thanh Nguyen | 200 m freestyle | 2:00.15 | 58 | did not advance | ||
| 400 m freestyle | 4:13.91 | 43 | did not advance | ||||
| Athlete | Event | Heat | Semifinal | Final | ||||
|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | |||
| align=left rowspan=2 | Ngô Thị Ngọc Quỳnh | 100 m breaststroke | did not advance | |||||
| 200 m breaststroke | did not advance | |||||||
| align=left rowspan=2 | Nguyễn Thị Ánh Viên | 200 m backstroke | 2:12.75 | 19 | did not advance | |||
| 400 m individual medley | 4:47.60 | 21 | did not advance | |||||