Sugarloaf Mountain is a small mountain and park about 10 miles (16 km) south of Frederick, Maryland. The closest village is Barnesville, located just over one mile from the foot of the mountain. The peak of this relatively low mountain is approximately 800 feet higher than the surrounding farmland. It is visible from many parts of northern Montgomery County and southern Frederick County, notably from I-270 north of the town of Germantown. Because of its geological and natural history interest, it was designated a National Natural Landmark in 1969. It is a notable example of an admission-free, privately owned scenic park.

Barnesville is a town in Montgomery County, Maryland, United States. It was incorporated in 1888. The population was 144 at the 2020 census.