Troitsk (Russian: Тро́ицк) 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.

[2] It was renamed Troitsk and granted town status in 1977.

On July 1, 2012 Troitsk was transferred to the city of Moscow and became a part of the newly established Troitsky Administrative Okrug.

[1][7] Prior to the transfer, within the framework of administrative divisions, it was incorporated as Troitsk Town Under Oblast Jurisdiction—an administrative unit with the status equal to that of the districts.

[9] It is home of a number of research institutes of the Russian Academy of Sciences, including: