| En Name: | Nikolayevsky District |
| Ru Name: | Николаевский район |
| Image View: | Nikolaevka ulianovskaya oblast.jpg |
| Coordinates: | 53.1256°N 47.2058°W |
| Image Coa: | Coat_of_arms_of_Nikolayevsky_Raion.png |
| Federal Subject: | Ulyanovsk Oblast |
| Adm Data As Of: | July 2012 |
| Adm Ctr Type: | work settlement |
| Adm Ctr Name: | Nikolayevka |
| 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: | 8 |
| No Of Urban-Type Settlements: | 1 |
| No Of Rural Localities: | 58 |
| Mun Data As Of: | July 2012 |
| Mun Formation1: | Nikolayevsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 1 |
| Mun Formation1 No Of Rural Settlements: | 8 |
| Area Km2: | 2084.27 |
| Pop 2010Census: | 27211 |
| Urban Pop 2010Census: | 23.5% |
| Rural Pop 2010Census: | 76.5% |
| Website: | http://nikolaevka.ulregion.ru/ |
| Date: | April 2013 |
Nikolayevsky District (Russian: Никола́евский райо́н) is an administrative[1] and municipal[2] district (raion), one of the twenty-one in Ulyanovsk Oblast, Russia. It is located in the southwest of the oblast. The area of the district is 2084.27km2. Its administrative center is the urban locality (a work settlement) of Nikolayevka. Population: 27,211 (2010 Census); The population of Nikolayevka accounts for 23.5% of the district's total population.