Ostrovnoy (Russian: Островно́й), previously known as Murmansk-140 (Му́рманск-140),[6] is a closed town in Murmansk Oblast, Russia.

[citation needed] There is no rail link to Ostrovnoy and the settlement is reachable by coastal ship, helicopter or small plane in winter.

[8] The Gremikha Naval Base was one of the Northern Fleet's main facilities for servicing nuclear submarines.

[9][10] Within the framework of administrative divisions, it is, together with six rural localities, incorporated as the closed administrative-territorial formation of Ostrovnoy—an administrative unit with the status equal to that of the districts.

[1] As a municipal division, the closed administrative-territorial formation of Ostrovnoy is incorporated as Ostrovnoy Urban Okrug.