Antigua and Barbuda competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Antigua and Barbuda qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Jeffrey Orel | Men's 50m Freestyle | 28.57 | 97 | Did not advance | |||
| Kyle Zreibe | Men's 100m Freestyle | 1:07.35 | 102 | Did not advance | |||
| Men's 50m Butterfly | 36.25 | 54 | Did not advance | ||||
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Karin O'Reilly Clashing | Women's 50m Freestyle | 31.41 | 68 | Did not advance | |||
| Women's 50m Butterfly | 36.87 | 49 | Did not advance | ||||