| En Name: | Zaozyorsk |
| Ru Name: | Заозёрск |
| Coordinates: | 69.3978°N 32.4492°W |
| Map Label Position: | right |
| Image Coa: | Coat of arms of Zaozersk (2001).gif |
| Federal Subject: | Murmansk Oblast |
| Adm City Jur: | closed administrative-territorial formation of Zaozyorsk |
| Adm Ctr Of: | closed administrative-territorial formation of Zaozyorsk |
| Inhabloc Cat: | Town |
| Urban Okrug Jur: | Zaozyorsk Urban Okrug |
| Mun Admctr Of: | Zaozyorsk Urban Okrug |
| Leader Title: | Head |
| Leader Name: | Igor Vinokur |
| Leader Name Ref: | [1] |
| Pop 2010Census: | 11199 |
| Established Date: | 1958 |
| Current Cat Date: | September 14, 1981 |
| Postal Codes: | 184310 |
| Dialing Codes: | 81556 |
| Website: | http://zatozaozersk.ru |
Zaozyorsk (Russian: Заозёрск), formerly known as Zaozyorny (Russian: Заозёрный), Severomorsk-7 (Russian: Североморск-7), and Murmansk-150 (Russian: Му́рманск-150), is a closed town in Murmansk Oblast, Russia. As of the 2010 Census, its population was 11,199; down from 12,687 recorded in the 2002 Census.
Building of what was to become Zaozyorsk began in 1958 as a base for a nuclear underwater fleet that would be deployed in 1961.[2] Originally known as Zaozyorny (Russian: Заозёрный), it was referred to as Severomorsk-7 (Russian: Североморск-7) for postal purposes. On September 14, 1981, it was granted town status and renamed Zaozyorsk, although for postal purposes the name Murmansk-150 (Russian: Му́рманск-150) was used. On January 4, 1994, the use of this code name was discontinued.
Within the framework of administrative divisions, it is incorporated as the closed administrative-territorial formation of Zaozyorsk—an administrative unit with the status equal to that of the districts.[3] As a municipal division, the closed administrative-territorial formation of Zaozyorsk is incorporated as Zaozyorsk Urban Okrug.[4]