Frederik Carlo Hviid Köhler (born 9 November 1974 in Las Palmas, Gran Canaria) is a former long-distance freestyle and medley swimmer from Spain who competed at two consecutive Summer Olympics for his native country, starting in 1996. In the late 1990s he won several medals in the international short course and long course events. He's a recipient of the Spanish Cross of the Order of Merit (Silver and Bronze designation), handed to him by then crown prince Felipe de Borbón (Felipe VI).