405 (2016 population: 509) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

Located in the west-central portion of the province, it is approximately 50 km (31 mi) to the northwest of Saskatoon.

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

[4] The majority of economic activity in the area is related to agriculture, predominantly grain farming and cattle ranching.

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