Custer is a census-designated place (CDP) in Yellowstone County, Montana, United States.

This community bears the name of U.S. Army General George Armstrong Custer who was defeated and killed at the Battle of Little Big Horn, which took place nearby in 1876.

Originally a Northern Pacific Railroad station established in 1882, the post office began in 1905.

[3] According to the United States Census Bureau, the CDP has a total area of 0.3 square miles (0.78 km2), all land.

39.7% of all households were made up of individuals, and 13.2% had someone living alone who was 65 years of age or older.