| En Name: | Atyashevo |
| Ru Name: | Атяшево |
| Loc Name1: | Отяжеле |
| Loc Lang1: | Erzya |
| Loc Lang2: | Moksha |
| Coordinates: | 54.6°N 51°W |
| Map Label Position: | left |
| Federal Subject: | Republic of Mordovia |
| Adm District Jur: | Atyashevsky District |
| Adm Selsoviet Jur: | Atyashevo Work Settlement |
| Adm Selsoviet Type: | Work Settlement |
| Adm Ctr Of1: | Atyashevsky District |
| Adm Ctr Of2: | Atyashevo Work Settlement |
| Inhabloc Cat: | Urban-type settlement |
| Inhabloc Type: | Work settlement |
| Mun District Jur: | Atyashevsky Municipal District |
| Urban Settlement Jur: | Atyashevskoye Urban Settlement |
| Mun Admctr Of1: | Atyashevsky Municipal District |
| Mun Admctr2 Of: | Atyashevskoye Urban Settlement |
| Pop 2010Census: | 6246 |
| Established Date: | 1894 |
| Current Cat Date: | 1963 |
| Postal Codes: | 431800, 431849 |
| Atyashevo population | |
| Label1: | 2010 Census |
| Data1: | 6,246 |
| Label2: | 2002 Census |
| Data2: | 6,073 |
| Label3: | 1989 Census |
| Data3: | 6,298 |
| Label4: | 1979 Census |
| Data4: | 4,393 |
Atyashevo (ru|Атя́шево; myv|Отяжеле, Otäžele) is an urban locality (a work settlement) and the administrative center of Atyashevsky District of the Republic of Mordovia, Russia. As of the 2010 Census, its population was 6,246.
It was founded in 1894; urban-type settlement status was granted to it in 1963.
Within the framework of administrative divisions, Atyashevo serves as the administrative center of Atyashevsky District.[1] As an administrative division, the work settlement of Atyashevo is incorporated within Atyashevsky District as Atyashevo Work Settlement. As a municipal division, Atyashevo Work Settlement is incorporated within Atyashevsky Municipal District as Atyashevskoye Urban Settlement.[2]