Viktor Leonidovich Demyanenko () (born August 26, 1958 in Alma-Ata, Kazakh SSR) is a retired boxer, who represented the USSR at the 1980 Summer Olympics in Moscow, Soviet Union. There he won the silver medal in the lightweight division (– 60 kg), after being defeated in the final by Cuba's Ángel Herrera. Demyanenko trained at Dynamo in Alma-Ata. He won gold at the 1979 European Championship. During his career Demyanenko won 267 fights out of 290.