Puerto Rico competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Puerto Rico qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Raul Martinez | Men's 200m Freestyle | 1:52.93 | 44 | Did not advance | |||
| Men's 400m Freestyle | 3:58.35 | 32 | Did not advance | ||||
| Christian Bayo | Men's 800m Freestyle | 8:17.02 | 37 | Did not advance | |||
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Patricia Casellas | Women's 50m Breaststroke | 33.62 | 25 | Did not advance | |||
| Women's 100m Breaststroke | 1:13.16 | 35 | Did not advance | ||||