Lebanon competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Lebanon qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Abbas Raad | Men's 50m Freestyle | 24.95 | 64 | Did not advance | |||
| Men's 100m Freestyle | 54.91 | 73 | Did not advance | ||||
| Wael Koubrousli | Men's 100m Breaststroke | 1:09.11 | 73 | Did not advance | |||
| Men's 200m Breaststroke | 2:27.08 | 50 | Did not advance | ||||
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Nibal Yamout | Women's 200m Breaststroke | 2:45.35 | 34 | Did not advance | |||
| Women's 200m IM | 2:27.93 | 35 | Did not advance | ||||