The Rural Municipality of Chaplin No. 164 (2016 population: ) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 7 and Division No. 2. It is located in the southwest portion of the province.
The RM of Chaplin No. 164 incorporated as a rural municipality on January 1, 1913.
Chaplin Lake, a large saline lake, is located in the RM.
The following urban municipalities are surrounded by the RM.
The following unincorporated communities are located within the RM.
In the 2021 Census of Population conducted by Statistics Canada, the RM of Chaplin No. 164 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 Chaplin No. 164 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 production of sodium sulphate is a major industry combined with grain and livestock agriculture.
The RM of Chaplin No. 164 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 Duane Doell while its administrator is Faye Campbell. The RM's office is located in Chaplin.