| En Name: | Selenginsky District |
| Ru Name: | Селенгинский район |
| Loc Name1: | Сэлэнгын аймаг |
| Loc Lang1: | Buryat |
| Image View: | Южные склоны хребта Моностой..JPG |
| Coordinates: | 51.2833°N 137°W |
| Federal Subject: | Republic of Buryatia |
| Adm Data As Of: | July 2013 |
| Adm Ctr Type: | town |
| Adm Ctr Name: | Gusinoozyorsk |
| Town Of District Significance Type: | Towns |
| No Of Towns Of District Significance: | 1 |
| Selsoviet Type1: | Selsoviets |
| No Of Selsoviets Type1: | 6 |
| Selsoviet Type2: | Somons |
| No Of Selsoviets Type2: | 7 |
| No Of Cities Towns: | 1 |
| No Of Rural Localities: | 36 |
| Mun Data As Of: | October 2014 |
| Mun Formation1: | Selenginsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 1 |
| Mun Formation1 No Of Rural Settlements: | 12 |
| Area Km2: | 8269 |
| Pop 2010Census: | 46427 |
| Urban Pop 2010Census: | 52.9% |
| Rural Pop 2010Census: | 47.1% |
| Established Date: | December 12, 1923 |
| Website: | http://admselenga.ru |
| Date: | February 2015 |
| Population of Selenginsky District | |
| Label1: | 2010 Census |
| Data1: | 46,427 |
| Label2: | 2002 Census |
| Data2: | 50,632 |
| Label3: | 1989 Census |
| Data3: | 27,098 |
| Label4: | 1979 Census |
| Data4: | 28,662 |
Selenginsky District (Russian: Селенги́нский райо́н; Buriat: Сэлэнгын аймаг, Selengyn aimag) is an administrative[1] and municipal[2] district (raion), one of the twenty-one in the Republic of Buryatia, Russia. It is located in the center of the republic. The area of the district is 8269km2.[3] Its administrative center is the town of Gusinoozyorsk. As of the 2010 Census, the total population of the district was 46,427, with the population of Gusinoozyorsk accounting for 52.9% of that number.
The district was established on December 12, 1923.
Within the framework of administrative divisions, Selenginsky District is one of the twenty-one in the Republic of Buryatia. It is divided into one town (an administrative division with the administrative center in the town (an inhabited locality) of Gusinoozyorsk), six selsoviets, and seven somons, which comprise thirty-six rural localities. As a municipal division, the district is incorporated as Selenginsky Municipal District. The Town of Gusinoozyorsk is incorporated an urban settlement, and the six selsoviets and seven somons are incorporated as twelve rural settlements within the municipal district. The town of Gusinoozyorsk serves as the administrative center of both the administrative and municipal district.