Gornozavodsk (Russian: Горнозаводск; (Japanese: 内幌町, Naihoro) is a rural locality (a selo) in Nevelsky District of Sakhalin Oblast, Russia, located in the southwest of the Sakhalin Island.

[6] It was founded in 1905 when the southern part of Sakhalin belonged to Japan.

[citation needed] At the end of World War II, the Soviet Army retook the whole of the island of Sakhalin and the Kuril Islands.

When coal mining was ended in the 1990s, its population dwindled.

As a result, Gornozavodsk was demoted to a rural locality in 2004.