Moss Bluff is a census-designated place (CDP) in Calcasieu Parish, Louisiana, United States. Located just north of the city of Lake Charles, it is considered a suburb of that city. Moss Bluff is a burgeoning community, and is one of the communities in Calcasieu Parish besides Lake Charles experiencing growth. Several efforts have been made to incorporate Moss Bluff, but at current time the community is unincorporated. According to the United States Census Bureau, the CDP has a total area of 15.8 square miles (41km2), of which, 15.2 square miles (39km2) of it is land and 0.6 square miles (1.6km2) of it (3.98%) is water. Moss Bluff is intersected by U.S. Highway 171 and Louisiana Highway 378.