Provincial Trunk Highway 12 (PTH 12) is a provincial highway in the Canadian province of Manitoba. It runs from the U.S. border (where it meets with Minnesota State Highway 313) to a dead end in Grand Beach. PTH 12 forms the Manitoba section of MOM's Way, a route from Thunder Bay to Winnipeg. Except for a 22 kilometre stretch of four lanes between Steinbach and Highway 1, PTH 12 is a two-lane highway.