| En Name: | Tryokhgorny |
| Ru Name: | Трёхгорный |
| Coordinates: | 54.8°N 85°W |
| Map Label Position: | right |
| Image Coa: | Coat of Arms of Tryokhgorny (Chelyabinsk oblast).png |
| Federal Subject: | Chelyabinsk Oblast |
| Adm City Jur: | Town of Tryokhgorny |
| Adm Ctr Of: | Town of Tryokhgorny |
| Inhabloc Cat: | Town |
| Urban Okrug Jur: | Tryokhgorny Urban Okrug |
| Mun Admctr Of: | Tryokhgorny Urban Okrug |
| Pop 2010Census: | 33670 |
| Established Date: | January 24, 1952 |
| Postal Codes: | 456080–456082 |
| Website: | http://admintrg.ru/ |
Tryokhgorny (ru|Трёхго́рный, lit. (a town of) three mountains) is a closed town in Chelyabinsk Oblast, Russia, located in the western part of the oblast 200km (100miles) from Chelyabinsk. Population:
On January 24, 1952, the Council of Ministers of the USSR issued decree No. 342—135сс/оп to build Plant #933 (Instrument Factory) for the production of atomic bombs. Konstantin Volodin headed the new plant. On April 9, 1952, first construction workers arrived to the area.
Within the framework of administrative divisions, it is incorporated as the Town of Tryokhgorny—an administrative unit with the status equal to that of the districts.[1] As a municipal division, the Town of Tryokhgorny is incorporated as Tryokhgorny Urban Okrug.
The town is closed because a plant producing nuclear weapons is located there.