Sumio Endo (遠藤 純男) is a Japanese judoka, Olympic medalist and world champion. Endo is from Kōriyama, Fukushima. After graduation from Nihon University, He belonged to Tokyo Metropolitan Police Department. Endo received a bronze medal in the heavyweight class at the 1976 Summer Olympics in Montreal. He is world champion from 1975 and from 1979. As of 2008, Endo coaches judo at North Asia University in Akita, Japan. He is also one of the 'Frontier Ambassadors' of his hometown Koriyama City.