Guyana competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Guyana qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Niall Roberts | Men's 50m Freestyle | 24.80 | 62 | Did not advance | |||
| Men's 100m Freestyle | 54.99 | 74 | Did not advance | ||||
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Britany van Lange | Women's 100m Freestyle | 1:01.39 | 55 | Did not advance | |||
| Women's 200m Freestyle | 2:16.40 | 46 | Did not advance | ||||
| Jessica Stephenson | Women's 100m Breaststroke | 1:16.54 | 40 | Did not advance | |||
| Women's 200m Breaststroke | 2:46.28 | 36 | Did not advance | ||||