Oak Hill is a mansion and plantation located in Aldie, Virginia that was for 22 years a home of Founding Father James Monroe, the fifth U.S. President. It is located approximately 9 miles (14 km) south of Leesburg on U.S. Route 15, in an unincorporated area of Loudoun County, Virginia. Its entrance is 10,300 feet (3,100 m) north of Gilberts Corner, the intersection of 15 with U.S. Route 50. It is a National Historic Landmark, but privately owned and not open to the public.

Aldie is an unincorporated community and census-designated place (CDP) located between Chantilly and Middleburg in Loudoun County, Virginia, United States. The historic village of Aldie is located on the John Mosby Highway in a gap between the Catoctin Mountains and Bull Run Mountains, through which the Little River flows. Aldie traditionally serves as the gateway to the Loudoun Valley and beyond.