| En Name: | Insar |
| Ru Name: | Инсар |
| Loc Name1: | Инзара |
| Loc Lang1: | Moksha |
| Loc Lang2: | Erzya |
| Coordinates: | 53.8667°N 67°W |
| Map Label Position: | top |
| Image Coa: | Coat of Arms of Insar (Mordovia) (1781).png |
| Federal Subject: | Republic of Mordovia |
| Adm District Jur: | Insarsky District |
| Adm Selsoviet Jur: | Insar |
| Adm Selsoviet Type: | Town of district significance |
| Adm Ctr Of1: | Insarsky District |
| Adm Ctr Of2: | town of district significance of Insar |
| Inhabloc Cat: | Town |
| Mun District Jur: | Insarsky Municipal District |
| Urban Settlement Jur: | Insar Urban Settlement |
| Mun Admctr Of1: | Insarsky Municipal District |
| Mun Admctr Of2: | Insar Urban Settlement |
| Pop 2010Census: | 8687 |
| Established Date: | 1648 |
| Current Cat Date: | 1958 |
| Postal Codes: | 431430 |
| Insar population | |
| Label1: | 2010 Census |
| Data1: | 8,687 |
| Label2: | 2002 Census |
| Data2: | 8,951 |
| Label3: | 1989 Census |
| Data3: | 9,275 |
| Label4: | 1979 Census |
| Data4: | 9,034 |
Insar (Russian: Инса́р; Moksha: Инзара, Inzara; Erzya: Инсар ош, Insar oš) is a town and the administrative center of Insarsky District of the Republic of Mordovia, Russia, located at the confluence of the Issa and Insarka Rivers, 77km (48miles) southwest of Saransk, the capital of the republic. As of the 2010 Census, its population was 8,687.
It was founded in 1648 as a fortress and a posad. Town status was granted to it in 1780; it was demoted to a rural locality in 1926. Town status was re-granted again in 1958.
Within the framework of administrative divisions, Insar serves as the administrative center of Insarsky District.[1] As an administrative division, it is, together with one rural locality (the settlement of Zarya), incorporated within Insarsky District as the town of district significance of Insar. As a municipal division, the town of district significance of Insar is incorporated within Insarsky Municipal District as Insar Urban Settlement.[2]