Arthur Franklin Mendes Filho (born August 7, 1993 in Cáceres) is a Brazilian swimmer. He was at the 2011 FINA World Junior Swimming Championships, in Lima, Peru, where he won a bronze medal in the 100-metre butterfly. At the 2015 Pan American Games in Toronto, Ontario, Canada, Mendes won the gold medal in the 4×100-metre medley relay, where he broke the Pan American Games record with a time of 3:32.68, along with Marcelo Chierighini, Felipe França Silva and Guilherme Guido. He also finished 7th in the 100 metre butterfly.