Mauritania competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Mauritania qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Eycub Leebeid | Men's 50m Freestyle | 45.18 | 116 | Did not advance | |||
| Hamza Labeid | Men's 50m Freestyle | DSQ | Did not advance | ||||
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Soukeina Abdellahi | Women's 50m Freestyle | DNS | Did not advance | ||||