Belt is a town in Cascade County, Montana, United States. The population was 597 according to the 2010 census. It is part of the Great Falls, Montana metropolitan area.
Belt was home to Montana's first coal mine. It supplied fuel to Fort Benton. The post office opened on February 2, 1885, with Eugene Clingan as postmaster.
Belt is located at 47°23′9″N 110°55′36″W (47.385935, -110.926587). According to the United States Census Bureau, the town has a total area of 0.35 square miles (0.91 km2), all of it land.
The town was named for Belt Butte, a nearby mountain which has a dark layer resembling a belt.
According to the Köppen Climate Classification system, Belt has a semi-arid climate, abbreviated "BSk" on climate maps.
As of the census of 2010, there were 597 people, 261 households, and 159 families living in the town. The population density was 1,705.7 inhabitants per square mile (658.6/km2). There were 295 housing units at an average density of 842.9 per square mile (325.4/km2).