Clément Lefert (born 26 September 1987 in Nice) is a retired French Olympic champion in swimming.
He won a gold medal at the London 2012 Summer Olympics in the 4 × 100 meters freestyle relay, with team mates Amaury Leveaux, Fabien Gilot, and Yannick Agnel, besting the American relay team that included Michael Phelps.
He also won a silver medal in the 4 x 200 meters freestyle relay.
Lefert is an economics major at the University of Southern California (USC), and holds USC's record in the 200 yard freestyle (1:33.67).On 1 January 2013, Lefert was made a Knight (Chevalier) of the Légion d'honneur.After finishing his higher education studies, he started as a trader in a commodities trading company in London.