Tunisia competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Tunisia qualified 4 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Oussama Mellouli | Men's 400m Freestyle | 3:45.90 | 4 Q | 3:45.31 | 7 | ||
| Men's 800m Freestyle | 7:48.86 | 5 Q | 7:45.99 | 4 | |||
| Men's 1500m Freestyle | 15:13.56 | 15 | Did not advance | ||||
| Ahmed Mathlouthi | Men's 400m Freestyle | 4:08.40 | 40 | Did not advance | |||
| Taki M'Rabet | Men's 200m IM | 2:01.44 | 24 | Did not advance | |||
| Men's 400m IM | 4:18.99 | 16 | Did not advance | ||||
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Sarra Lajnef | Women's 400m IM | 4:51.89 | 29 | Did not advance | |||