The Rural Municipality of Abernethy No. 186 (2016 population: ) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 6 and Division No. 1. It is located on the Qu'Appelle River.
The RM of Abernethy No. 186 incorporated as a rural municipality on December 11, 1911.
The following urban municipalities are surrounded by the RM.
The following unincorporated communities are within the RM.
Along the southwest boundary of the RM is Katepwa Lake, which is one of the four Fishing Lakes in the Qu'Appelle Valley. The rest of the southern border follows the Qu'Appelle River.
In the 2021 Census of Population conducted by Statistics Canada, the RM of Abernethy No. 186 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 Abernethy No. 186 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 Abernethy No. 186 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 John Fishley while its administrator is Karissa Lingelbach . The RM's office is located in Abernethy.