| En Name: | Kyakhtinsky District |
| Ru Name: | Кяхтинский район |
| Loc Name1: | Хяагтын аймаг |
| Loc Lang1: | Buryat |
| Image View: | Lake Kiran.jpg |
| Coordinates: | 50.35°N 133°W |
| Image Coa: | Coat of Arms of Kyahtinsky rayon (Buryatiya).jpg |
| Federal Subject: | Republic of Buryatia |
| Adm Data As Of: | July 2013 |
| Adm Ctr Type: | town |
| Adm Ctr Name: | Kyakhta |
| Town Of District Significance Type: | Towns |
| No Of Towns Of District Significance: | 1 |
| Urban-Type Settlement Of District Significance Type: | Urban-type settlements |
| No Of Urban-Type Settlements Of District Significance: | 1 |
| Selsoviet Type1: | Selsoviets |
| No Of Selsoviets Type1: | 8 |
| Selsoviet Type2: | Somons |
| No Of Selsoviets Type2: | 5 |
| No Of Cities Towns: | 1 |
| No Of Urban-Type Settlements: | 1 |
| No Of Rural Localities: | 40 |
| Mun Data As Of: | October 2014 |
| Mun Formation1: | Kyakhtinsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 2 |
| Mun Formation1 No Of Rural Settlements: | 15 |
| Area Km2: | 4684 |
| Pop 2010Census: | 39785 |
| Urban Pop 2010Census: | 58.9% |
| Rural Pop 2010Census: | 41.1% |
| Established Date: | December 12, 1923 |
| Website: | http://admkht.ru |
| Date: | February 2015 |
| Population of Kyakhtinsky District | |
| Label1: | 2010 Census |
| Data1: | 39,785 |
| Label2: | 2002 Census |
| Data2: | 40,673 |
| Label3: | 1989 Census |
| Data3: | 45,224 |
| Label4: | 1979 Census |
| Data4: | 42,755 |
Kyakhtinsky District (Russian: Кя́хтинский райо́н, pronounced as /ru/; Buriat: Хяагтын аймаг|Khiaagtyn 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 south of the republic. The area of the district is 4684km2.[3] Its administrative center is the town of Kyakhta. As of the 2010 Census, the total population of the district was 39,785, with the population of Kyakhta accounting for 50.3% of that number.
The district is located in southern Buryatia, near the Mongolia–Russia border, in the geographical region of the Selenga Highlands.
The district was established on December 12, 1923.
Within the framework of administrative divisions, Kyakhtinsky 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 Kyakhta), one urban-type settlement (an administrative division with the administrative center in the urban-type settlement (inhabited locality) of Naushki), eight selsoviets, and five somons, all of which comprise forty rural localities. As a municipal division, the district is incorporated as Kyakhtinsky Municipal District. The town (together with one rural locality—the settlement of Sudzha) and the urban-type settlement are incorporated as two urban settlements, and the eight selsoviets and five somons are incorporated as fifteen rural settlements within the municipal district. The town of Kyakhta serves as the administrative center of both the administrative and municipal district.