| En Name: | Mosalsky District |
| Ru Name: | Мосальский район |
| Image View: | Ленск (Богоявленское, Мосал.). Вид на Богоявленскую церковь из-за Рессы..JPG |
| Coordinates: | 54.4833°N 93°W |
| Image Coa: | Coat of Arms of Mosalsk (Kaluga oblast).png |
| Federal Subject: | Kaluga Oblast |
| Adm Ctr Type: | town |
| Adm Ctr Name: | Mosalsk |
| No Of Cities Towns: | 1 |
| No Of Rural Localities: | 173 |
| Mun Data As Of: | February 2012 |
| Mun Formation1: | Mosalsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 1 |
| Mun Formation1 No Of Rural Settlements: | 10 |
| Area Km2: | 1320 |
| Pop 2010Census: | 9094 |
| Urban Pop 2010Census: | 47.2% |
| Rural Pop 2010Census: | 52.8% |
| Website: | http://mosalsk-adm.ru/ |
| Date: | August 2011 |
Mosalsky District (Russian: Мосальский райо́н) is an administrative[1] and municipal[2] district (raion), one of the twenty-four in Kaluga Oblast, Russia. It is located in the west of the oblast. The area of the district is 1320km2. Its administrative center is the town of Mosalsk.[3] Population: 10,357 (2002 Census); The population of Mosalsk accounts for 46.4% of the district's total population.