The Army of Northern Virginia was the primary military force of the Confederate States of America in the Eastern Theater of the American Civil War. It was also the primary command structure of the Department of Northern Virginia. It was most often arrayed against the Union Army of the Potomac.

Northern Virginia, locally referred to as NOVA or NoVA, comprises several counties and independent cities in the Commonwealth of Virginia in the United States. The region radiates westward and southward from Washington, D.C., the nation's capital, and has a population of 3,257,133 people as of 2023 U.S. Census Bureau estimates, representing of a third of the state's total population. It is the most populous region in both Virginia and the regional Washington metropolitan area.