Fort Washington, located near the community of Fort Washington, Maryland, was for many decades the only defensive fort protecting Washington, D.C. The original fort, overlooking the Potomac River, was completed in 1809, and was begun as Fort Warburton, but renamed in 1808. During the War of 1812, the fort was destroyed by its own garrison during a British advance.

Fort Washington is an unincorporated area and census-designated place in Prince George's County, Maryland, United States. It borders the Potomac River, situated 20 miles south of downtown Washington, D.C. As of the 2020 census, it had a population of 24,261. The Fort Washington community is located west of Maryland Route 210, with some additional area to the east of the highway.