Mehdy Metella (born 17 July 1992) is a French freestyle and butterfly swimmer. He was part of the freestyle and medley 4×100 m teams that won a gold and a silver medal at the 2014 European Aquatics Championships and gold and bronze at the 2015 World Championship. In both cases, he swam the butterfly leg in the medley relay.
He also won multiple medals in the World and European Short Course swimming events.
He is the French record holder of the 100m butterfly long course, with a time of 51.06.
He is the younger brother of Malia Metella, an Olympic and World championship medallist.