| En Name: | Nikolayevka |
| Ru Name: | Николаевка |
| Loc Lang1: | Erzya |
| Loc Lang2: | Moksha |
| Coordinates: | 54.15°N 53°W |
| Map Label Position: | top |
| Federal Subject: | Republic of Mordovia |
| Adm City Jur: | city of republic significance of Saransk |
| Adm District Jur: | Oktyabrsky City District |
| Adm Selsoviet Jur: | Nikolayevka Work Settlement |
| Adm Selsoviet Type: | Work Settlement |
| Adm Ctr Of: | Nikolayevka Work Settlement |
| Inhabloc Cat: | Urban-type settlement |
| Inhabloc Type: | Work settlement |
| Urban Okrug Jur: | Saransk Urban Okrug |
| Pop 2010Census: | 5058 |
| Established Date: | 1860s |
| Current Cat Date: | 1969 |
| Postal Codes: | 430903 |
| Nikolayevka population | |
| Label1: | 2010 Census |
| Data1: | 5,058 |
| Label2: | 2002 Census |
| Data2: | 5,199 |
| Label3: | 1989 Census |
| Data3: | 5,662 |
| Label4: | 1979 Census |
| Data4: | 5,449 |
Nikolayevka (Russian: Никола́евка) is an urban locality (a work settlement) under the administrative jurisdiction of Oktyabrsky City District of the city of republic significance of Saransk in the Republic of Mordovia, Russia. As of the 2010 Census, its population was 5,058.
It was founded in the 1860s; urban-type settlement status was granted to it in 1969.
Within the framework of administrative divisions, the work settlement of Nikolayevka, together with two rural localities, is incorporated as Nikolayevka Work Settlement, which is subordinated to Oktyabrsky City District of the city of republic significance of Saransk.[1] Within the framework of municipal divisions, Nikolayevka is a part of Saransk Urban Okrug.[2]