Luxembourg competed at the 2011 World Aquatics Championships in Shanghai, China between July 16 and 31, 2011.
Luxembourg qualified 3 swimmers.[1]
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Jean-Francois Schneiders | Men's 50m Backstroke | 26.70 | 26 | Did not advance | |||
| Men's 100m Backstroke | 57.03 | 42 | Did not advance | ||||
| Men's 200m Backstroke | 2:03.68 | 28 | Did not advance | ||||
| Laurent Carnol | Men's 50m Breaststroke | 28.63 | 33 | Did not advance | |||
| Men's 100m Breaststroke | 1:01.57 | 30 | Did not advance | ||||
| Men's 200m Breaststroke | 2:12.56 | 12 Q | 2:12.23 | 15 | Did not advance | ||
| Raphael Stacchiotti | Men's 200m IM | 2:00.87 | 20 | Did not advance | |||
| Men's 400m IM | 4:20.64 | 20 | Did not advance | ||||