Buffalo No. 409 is a rural municipality in the Canadian province of Saskatchewan, located in the Census Division 13. The seat of the municipality is located in the Town of Wilkie.
In 2006, the Rural municipality had a population of 525 in 212 dwellings, a -15.0% decrease from 2001. On a surface of 1,222.08 km² it has a density of 0.4 inhabitants/km².
The following urban municipalities are surrounded by the Rural Municipality:
The following hamlets are located within the Rural Municipality: