Troitsk is a town in Troitsky Administrative Okrug of the federal city of Moscow, Russia, located on the Desna River 37 kilometers (23 mi) southwest from the center of Moscow on the Kaluzhskoye Highway. Population: 39,873 ; 32,653 ; 29,301 (1989 Soviet census).

The Russian Academy of Sciences consists of the national academy of Russia; a network of scientific research institutes from across the Russian Federation; and additional scientific and social units such as libraries, publishing units, and hospitals.