Mortlach is a village in the Canadian province of Saskatchewan, located within the Rural Municipality of Wheatlands No. 163 and Census Division No. 7. The village sits on Saskatchewan Highway 1 approximately 40 km west of the city of Moose Jaw. Thunder Creek passes the community to the north, where it is joined by Sandy Creek.
Mortlach became a village on April 19, 1906. It is one of only two communities in Saskatchewan to have been incorporated as a town and then reverted to village status, which occurred on January 1, 1949. The other community to share this distinction is the village of Alsask.