St. Mary or Saint Mary (Blackfeet: Natoaki, "Holy Woman") is an unincorporated community on the western border of the Blackfeet Indian Reservation adjacent to Glacier National Park in Glacier County, Montana. The village is the eastern terminus of the Going-to-the-Sun Road which bisects the park east to west, a distance of 53 mi.
As of the 2020 census, St. Mary had a population of 54. The population increases tenfold on a busy summer evening. Several lodges, restaurants and cafés, a small grocery store, two gas stations and campgrounds are located in the village. A large housing area for National Park Service personnel is located adjacent to the village, but within the park.