| En Name: | Tsilninsky District |
| Ru Name: | Цильнинский район |
| Image View: | Мостик в Норовке 12.JPG |
| Coordinates: | 54.5167°N 105°W |
| Image Coa: | Coat of arms of Tsilninsky Raion.jpg |
| Federal Subject: | Ulyanovsk Oblast |
| Adm Data As Of: | July 2012 |
| Adm Ctr Type: | selo |
| Adm Ctr Name: | Bolshoye Nagatkino |
| Urban-Type Settlement Of District Significance Type: | Settlement okrugs |
| No Of Urban-Type Settlements Of District Significance: | 1 |
| Selsoviet Type1: | Rural okrugs |
| No Of Selsoviets Type1: | 7 |
| No Of Urban-Type Settlements: | 1 |
| No Of Rural Localities: | 54 |
| Mun Data As Of: | July 2012 |
| Mun Formation1: | Tsilninsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 1 |
| Mun Formation1 No Of Rural Settlements: | 7 |
| Area Km2: | 1293 |
| Pop 2010Census: | 27543 |
| Urban Pop 2010Census: | 15.0% |
| Rural Pop 2010Census: | 85.0% |
| Website: | http://cilna.ru/ |
| Date: | May 2013 |
Tsilninsky District (Russian: Ци́льнинский райо́н) is an administrative[1] and municipal[2] district (raion), one of the twenty-one in Ulyanovsk Oblast, Russia. It is located in the north of the oblast. The area of the district is 1293km2. Its administrative center is the rural locality (a selo) of Bolshoye Nagatkino. Population: 27,543 (2010 Census); The population of Bolshoye Nagatkino accounts for 19.8% of the district's total population.