Marshall Hall was an amusement park in Charles County, Maryland, next to the Potomac River, more or less across from Mount Vernon, Virginia, the home of George Washington. The site of a small amusement park dating from the 1890s, a modern amusement park was constructed there in 1966 and operated until 1980. It was a favorite of Washington, DC residents who often arrived by excursion boat.
It is now part of Piscataway Park operated by the National Park Service.