The Rural Municipality of Arm River No. 252 (2016 population: ) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 11 and Division No. 5. It is located along Highway 11 between Saskatoon and Regina.
The RM of Girvin No. 252 was originally incorporated as a rural municipality on December 13, 1909. Its name was changed to the RM of Arm River No. 252 on June 29, 1912.
The following urban municipalities are surrounded by the RM.
The following unincorporated communities are within the RM.
In the 2021 Census of Population conducted by Statistics Canada, the RM of Arm River No. 252 had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.
In the 2016 Census of Population, the RM of Arm River No. 252 recorded a population of living in of its total private dwellings, a change from its 2011 population of . With a land area of , it had a population density of in 2016.
The RM of Arm River No. 252 is governed by an elected municipal council and an appointed administrator that meets on the second Tuesday of every month. The reeve of the RM is Wayne Obrigewitsch while its administrator is Yvonne (Bonny) Goodsman. The RM's office is located in Davidson.