Black Eagle is a census-designated place (CDP) in Cascade County, Montana, United States. The population was 904 at the 2010 census. It is a suburb of Great Falls, Montana.
With early activity from smelters and refineries, Black Eagle was first called "Little Chicago". This was a reference to the industrialized nature of the town. When the post office was established in 1917 the name of the town officially became Black Eagle. It was named for the Black Eagle Falls on the Missouri River, which were named by Capt. Meriwether Lewis.
Construction of the Boston & Montana smelter, which formed the town's skyline, began in 1891. It was demolished on September 18, 1982.
Black Eagle is located at 47°31′35″N 111°16′42″W (47.526385, -111.278459).
According to the United States Census Bureau, the CDP has a total area of 1.7 square miles (4.4 km2), of which, 1.5 square miles (3.9 km2) of it is land and 0.1 square miles (0.26 km2) of it (8.33%) is water.
As of the census of 2000, there were 914 people, 418 households, and 237 families residing in the CDP. The population density was 590.3 people per square mile (227.7/km2).