378 (2016 population: 201) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

378 incorporated as a rural municipality on December 12, 1910.

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

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

[3] The reeve of the RM is Albert L. Kammer while its administrator is Kara Kirilenko.