381 (2016 population: 399) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

In the 2021 Census of Population conducted by Statistics Canada, the RM of Grass Lake No.

[7] In the 2016 Census of Population, the RM of Grass Lake No.

381 is governed by an elected municipal council and an appointed administrator that meets on the first Tuesday of every month.

[3] The reeve of the RM is Scott Vetter while its administrator is Theresa Poschenrieder.