William Hickling Prescott House, also known as the Headquarters House, is an historic house museum located at 55 Beacon Street on Beacon Hill in Boston, Massachusetts. It is the left-hand portion of a double townhouse at 54–55 Beacon Street, seen in the photograph. The townhouse, built in 1808 to a design by Asher Benjamin, was designated a National Historic Landmark in 1964 for its association with William Hickling Prescott (1796–1859), one of the nation's first historians. The house is now a museum operated by the Massachusetts chapter of the National Society of the Colonial Dames of America, which purchased it for its headquarters in 1944.