Vietnam competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
See main article: Swimming at the 2011 World Aquatics Championships.
Vietnam qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Phạm Thành Nguyện | Men's 100m Freestyle | 53.10 | 63 | align=center colspan=4 | did not advance | ||
| Men's 200m Freestyle | 1:55.33 | 48 | align=center colspan=4 | did not advance | |||
| Hoàng Quý Phước | Men's 100m Freestyle | 52.11 | 55 | align=center colspan=4 | did not advance | ||
| Men's 100m Butterfly | 54.39 | 39 | align=center colspan=4 | did not advance | |||
| Men's 200m Butterfly | 2:05.42 | 38 | align=center colspan=4 | did not advance | |||
| Võ Thái Nguyên | Men's 200m Butterfly | 2:01.25 | 33 | align=center colspan=4 | did not advance | ||
| Men's 400m IM | 4:41.02 | 33 | align=center colspan=2 | did not advance | |||