The Rural Municipality of Kelvington No. 366 (2016 population: ) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 14 and Division No. 4. It is located in the southeast portion of the province.
The RM of Kelvington No. 366 incorporated as a rural municipality on January 1, 1913.
The following urban municipalities are surrounded by the RM.
It also surrounds the Yellow Quill 90 First Nations Indian reserve.
In the 2021 Census of Population conducted by Statistics Canada, the RM of Kelvington No. 366 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 Kelvington No. 366 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 Kelvington No. 366 is governed by an elected municipal council and an appointed administrator that meets on the second Thursday of every month. The reeve of the RM is Maurice Patenaude while its administrator is Heather Elmy. The RM's office is located in Kelvington.