| En Name: | Mariinsky Posad |
| Ru Name: | Мариинский Посад |
| Loc Name1: | Сĕнтĕрвăрри |
| Loc Lang1: | Chuvash |
| Coordinates: | 56.1°N 90°W |
| Map Label Position: | bottom |
| Image Coa: | Coat of Arms of Mariinsky Posad (Chuvashia).png |
| Federal Subject: | Chuvash Republic |
| Adm District Jur: | Mariinsko-Posadsky District |
| Adm Selsoviet Jur: | Mariinsko-Posadskoye |
| Adm Selsoviet Type: | Urban settlement |
| Adm Ctr Of1: | Mariinsko-Posadsky District |
| Adm Ctr Of2: | Mariinsko-Posadskoye Urban Settlement |
| Inhabloc Cat: | Town |
| Mun District Jur: | Mariinsko-Posadsky Municipal District |
| Urban Settlement Jur: | Mariinsko-Posadskoye Urban Settlement |
| Mun Admctr Of1: | Mariinsko-Posadsky Municipal District |
| Mun Admctr Of2: | Mariinsko-Posadskoye Urban Settlement |
| Pop 2010Census: | 9088 |
| Established Date: | 1620 |
| Established Title: | First mentioned |
| Current Cat Date: | 1856 |
| Prev Name1: | Sundyr |
| Postal Codes: | 429570, 429572, 429573 |
| Website: | http://gov.cap.ru/Default.aspx?gov_id=412 |
| Bodystyle: | width:23.5em |
| Mariinsky Posad population | |
| Label1: | 2010 Census |
| Data1: | 9,088 |
| Label2: | 2002 Census |
| Data2: | 10,273 |
| Label3: | 1989 Census |
| Data3: | 10,443 |
| Label4: | 1979 Census |
| Data4: | 10,025 |
Mariinsky Posad (ru|Марии́нский Поса́д; cv|Сĕнтĕрвăрри, Sĕntĕrvărri) is a town and the administrative center of Mariinsko-Posadsky District in the Chuvash Republic, Russia, located on the right bank of the Volga River, 36km (22miles) east of Cheboksary, the capital of the republic. As of the 2010 Census, its population was 9,088.
It was first mentioned in 1620 as the selo of Sundyr (Russian: Сундырь), named after the Sundyrka River (a tributary of the Volga).[1] It was granted town status and renamed Mariinsky Posad after Empress consort Maria Alexandrovna in 1856.
Within the framework of administrative divisions, Mariinsky Posad serves as the administrative center of Mariinsko-Posadsky District.[2] As an administrative division, it is incorporated within Mariinsko-Posadsky District as Mariinsko-Posadskoye Urban Settlement. As a municipal division, this administrative unit also has urban settlement status and is a part of Mariinsko-Posadsky Municipal District.[3]
There are eleven processing, mechanical engineering, and construction materials factories in the town. Some of the other industries of employment in the city are a plant of cable works, a large automobile-repairing industry, a distillery, and a cooking oil-producing plant.
The area around the town has rich wildlife. There are several national parks and reservations nearby. The area is a popular ecotourism destination.
The town has several schools.