Boundary Field is a former baseball ground located in Washington, D.C. The ground was home to the Washington Senators of the American Association in 1891 and then the National League from 1892 to 1899 after the League absorbed the Association. The League contracted in 1900 and the Nationals were a casualty.

The field was also called National Park as the home of the American League's Washington Nationals (1903-1911). It was destroyed by fire March 17, 1911 and was rebuilt as the ballpark that would later be known as Griffith Stadium.

Coordinates: 38°55′3″N 77°1′13″W / 38.9175°N 77.02028°W / 38.9175; -77.02028