The Rural Municipality of Chester No. 125 (2016 population: ) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 5 and Division No. 1. It is located in the southeast portion of the province.
The RM of Chester No. 125 incorporated as a rural municipality on December 13, 1909.
There is one designated heritage building located within the rural municipality:
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 Chester No. 125 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 Chester No. 125 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 Chester No. 125 is governed by an elected municipal council and an appointed administrator that meets on the first Wednesday of every month. The reeve of the RM is Merril Wozniak while its administrator is James Hoff. The RM's office is located in Glenavon.