| En Name: | Sernur |
| Ru Name: | Сернур |
| Loc Name1: | Шернур |
| Loc Lang1: | Meadow Mari |
| Loc Lang2: | Hill Mari |
| Coordinates: | 56.9333°N 58°W |
| Map Label Position: | bottom |
| Federal Subject: | Mari El Republic |
| Adm Data As Of: | October 2014 |
| Adm District Jur: | Sernursky District |
| Adm Selsoviet Jur: | Sernur Urban-Type Settlement |
| Adm Selsoviet Type: | Urban-type settlement |
| Adm Ctr Of1: | Sernursky District |
| Adm Ctr Of2: | Sernur Urban-Type Settlement |
| Inhabloc Cat: | Urban-type settlement |
| Mun Data As Of: | August 2014 |
| Mun District Jur: | Sernursky Municipal District |
| Urban Settlement Jur: | Sernur Urban Settlement |
| Mun Admctr Of1: | Sernursky Municipal District |
| Mun Admctr Of2: | Sernur Urban Settlement |
| Pop 2010Census: | 8686 |
| Postal Codes: | 425450, 425477–425479 |
| Date: | August 2015 |
| Sernur population | |
| Label1: | 2010 Census |
| Data1: | 8,686 |
| Label2: | 2002 Census |
| Data2: | 9,031 |
| Label3: | 1989 Census |
| Data3: | 10,196 |
| Label4: | 1979 Census |
| Data4: | 8,425 |
Sernur (Russian: Се́рнур; Шернур, Šernur) is an urban locality (an urban-type settlement) and the administrative center of Sernursky District of the Mari El Republic, Russia. As of the 2010 Census, its population was 8,686.
Within the framework of administrative divisions, Sernur serves as the administrative center of Sernursky District.[1] As an administrative division, the urban-type settlement of Sernur, together with three rural localities, is incorporated within Sernursky District as Sernur Urban-Type Settlement (an administrative division of the district).[2] As a municipal division, Sernur Urban-Type Settlement is incorporated within Sernursky Municipal District as Sernur Urban Settlement.[3]