366 (2016 population: 398) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

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 is governed by an elected municipal council and an appointed administrator that meets on the second Thursday of every month.

[3] The reeve of the RM is Maurice Patenaude while its administrator is Heather Elmy.