Komsomolsk or Komsomolsk-on-Amur, Rus. Komsomolsk-na-Amure, city (1989 pop. 315,000), Khabarovsk Territory, S Russian Far East, on the Amur River. It is a manufacturing center producing steel, machinery, refined oil, ships, aircraft, electrical goods, and wood products. Tin mines are nearby. The city was founded (1932) by the Komsomol (the Communist youth organization) with a great loss of life.