| En Name: | Selenginsk |
| Ru Name: | Селенгинск |
| Loc Name1: | Сэлэнгын |
| Loc Lang1: | Buryat |
| Coordinates: | 52.0167°N 158°W |
| Map Label Position: | right |
| Federal Subject: | Republic of Buryatia |
| Adm District Jur: | Kabansky District |
| Adm Selsoviet Jur: | Selenginsk Urban-Type Settlement |
| Adm Selsoviet Type: | Urban-type settlement |
| Adm Ctr Of: | Selenginsk Urban-Type Settlement |
| Inhabloc Cat: | Urban-type settlement |
| Mun District Jur: | Kabansky Municipal District |
| Urban Settlement Jur: | Selenginskoye Urban Settlement |
| Mun Admctr Of: | Selenginskoye Urban Settlement |
| Pop 2010Census: | 14546 |
| Established Date: | 1961 |
| Postal Codes: | 671247 |
| Selenginsk population | |
| Label1: | 2010 Census |
| Data1: | 14,546 |
| Label2: | 2002 Census |
| Data2: | 16,326 |
| Label3: | 1989 Census |
| Data3: | 15,233 |
| Label4: | 1979 Census |
| Data4: | 13,000 |
Selenginsk (ru|Селенги́нск; bua|Сэлэнгын, Selengyn, mn|Сэлэнгэ, Selenge) is an urban locality (an urban-type settlement) in Kabansky District of the Republic of Buryatia, Russia, located at the head of the Selenga River delta about 30km (20miles) from Lake Baikal and about 50km (30miles) northwest of Ulan-Ude, the capital of the republic. As of the 2010 Census, its population was 14,546.
It was established in 1961 as a Komsomol project around a paper mill. In post-Soviet times the paper mill was seen as a major source of pollution.
Within the framework of administrative divisions, the urban-type settlement (inhabited locality) of Selenginsk is incorporated within Kabansky District as Selenginsk Urban-Type Settlement[1] (an administrative division of the district).[2] As a municipal division, Selenginsk Urban-Type Settlement is incorporated within Kabansky Municipal District as Selenginskoye Urban Settlement.[3]
Selenginsk stands on the Trans-Siberian Railway and the Trans-Siberian Highway.