Luxembourg's delegation for swimming consisted of Laurent Carnol and Raphaël Stacchiotti. Carnol, aged 22, competed in London in his second Olympic games in the 100 and 200 metre breaststroke events, after finishing in 40th position in the 200 metres breaststroke in 2008. Stacchiotti, aged 20, was present in the 200 and 400 metre individual medleys, after finishing in 49th place in the 200 metres freestyle in the 2008 Summer Olympics.