| En Name: | Ardatovsky District |
| Ru Name: | Ардатовский район |
| Loc Name1: | Орданьбуе |
| Loc Lang1: | Erzya |
| Loc Name2: | Ардатовань аймак |
| Loc Lang2: | Moksha |
| Image View: | Rator lej Ordanjbye.jpg |
| Imge Caption: | Alatyr River near the village of Mokrovka, Ardatov District |
| Coordinates: | 54.85°N 60°W |
| Image Coa: | Coat of Arms of Ardatov (2011).png |
| Federal Subject: | Republic of Mordovia |
| Adm Data As Of: | June 2015 |
| Adm Ctr Type: | town |
| Adm Ctr Name: | Ardatov |
| Town Of District Significance Type: | Towns of district significance |
| No Of Towns Of District Significance: | 1 |
| Urban-Type Settlement Of District Significance Type: | Work settlements |
| No Of Urban-Type Settlements Of District Significance: | 1 |
| Selsoviet Type1: | Selsoviets |
| No Of Selsoviets Type1: | 21 |
| No Of Cities Towns: | 1 |
| No Of Urban-Type Settlements: | 1 |
| No Of Rural Localities: | 54 |
| Mun Data As Of: | May 2014 |
| Mun Formation1: | Ardatovsky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 2 |
| Mun Formation1 No Of Rural Settlements: | 21 |
| Area Km2: | 1192.5 |
| Pop 2010Census: | 29446 |
| Urban Pop 2010Census: | 49.8% |
| Rural Pop 2010Census: | 50.2% |
| Website: | https://ardatov-rm.ru/ |
| Date: | January 2023 |
| Population of Ardatovsky District | |
| Label1: | 2010 Census |
| Data1: | 29,446 |
| Label2: | 2002 Census |
| Data2: | 31,565 |
| Label3: | 1989 Census |
| Data3: | 36,210 |
| Label4: | 1979 Census |
| Data4: | 41,384 |
Ardatovsky District (Russian: Арда́товский райо́н; Erzya: Орданьбуе Ordańbuje; Moksha: Ардатовань аймак, Ardatovań ajmak) is an administrative[1] and municipal[2] district (raion), one of the twenty-two in the Republic of Mordovia, Russia. It is located in the northeast of the republic. The area of the district is 1192.5km2.[3] Its administrative center is the town of Ardatov.[4] As of the 2010 Census, the total population of the district was 29,446, with the population of Ardatov accounting for 31.9% of that number.
Within the framework of administrative divisions, Ardatovsky District is one of the twenty-two in the republic. It is divided into one town of district significance (Ardatov), one work settlement (an administrative division with the administrative center in the work settlement (inhabited locality) of Turgenevo), and twenty-one selsoviets, all of which comprise fifty-four rural localities. As a municipal division, the district is incorporated as Ardatovsky Municipal District. The town of district significance of Ardatov and Turgenevo Work Settlement are incorporated into two urban settlements, and the twenty-one selsoviets are incorporated into twenty-one rural settlements within the municipal district. The town of Ardatov serves as the administrative center of both the administrative and municipal district.