Provincial Trunk Highway 12 is a provincial primary highway located in the Canadian province of Manitoba. Lying entirely in the Eastman Region, it runs from the U.S. border to a dead end in Grand Beach. PTH 12 forms the Manitoba section of MOM's Way, a tourist route from Thunder Bay to Winnipeg. PTH 12 is primarily a two-lane highway except for two four-lane stretch between Steinbach and PTH 1 and a ten-kilometre concurrency with PTH 44.

Steinbach is the third-largest city in the province of Manitoba, Canada and, with a population of 17,806, the largest community in the Eastman region. The city, located about 58 km (36 mi) southeast of the provincial capital of Winnipeg, is bordered by the Rural Municipality of Hanover to the north, west, and south, and the Rural Municipality of La Broquerie to the east. Steinbach was first settled by Plautdietsch-speaking Mennonites from Ukraine in 1874, whose descendants continue to have a significant presence in the city today. Steinbach is found on the eastern edge of the Canadian Prairies, while Sandilands Provincial Forest is a short distance east of the city.