Vietnam competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Vietnam qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Pham Nguyen | Men's 100m Freestyle | 53.10 | 63 | Did not advance | |||
| Men's 200m Freestyle | 1:55.33 | 48 | Did not advance | ||||
| Quy Phuoc Hoang | Men's 100m Freestyle | 52.11 | 55 | Did not advance | |||
| Men's 100m Butterfly | 54.39 | 39 | Did not advance | ||||
| Men's 200m Butterfly | 2:05.42 | 38 | Did not advance | ||||
| Vo Nguyen | Men's 200m Butterfly | 2:01.25 | 33 | Did not advance | |||
| Men's 400m IM | 4:41.02 | 33 | Did not advance | ||||