Demir Atasoy (also Dmitry Cherkasov, born May 26, 1987 in Dnipropetrovsk, Ukrainian SSR) is a Ukrainian-born Turkish swimmer, who specialized in the breaststroke events. Laureate of the National Rating «Top 100 Outstanding Men of Kyiv Region». At the 2013 Mediterranean Games held in Mersin, Turkey, he won the bronze medal in the men's 4 × 100 m medley relay. He won four gold medals and one silver medal at the 2013 Islamic Solidarity Games held in Palembang, Indonesia.