Grand Cape Mount is a county in the northwestern portion of the West African nation of Liberia. One of 15 counties that constitute the first-level of administrative division in the nation, it has five districts. Robertsport serves as the capital with the area of the county measuring 1,993 square miles (5,160 km2). As of the 2008 Census, it had a population of 129,817, making it the eighth most populous county in Liberia. The county is bordered by Gbarpolu County to the northeast and Bomi County to the southeast. The northern part of Grand Cape Mount borders the nation of Sierra Leone, while to the west lies the Atlantic Ocean.

Robertsport is a town in western Liberia, about 10 miles from the Sierra Leone border. It is named after Joseph Jenkins Roberts, the first president of Liberia.