Anderson House, also known as Larz Anderson House, is a Gilded Age mansion located at 2118 Massachusetts Avenue, NW, on Embassy Row in the Dupont Circle neighborhood of Washington, D.C. It now houses the Society of the Cincinnati's international headquarters and a research library on 17th- and 18th-century military and naval history and the art of war. It is also open to the public as a historic house museum about life in Washington in the early 20th century.

Embassy Row is the informal name for a section of Northwest Washington, D.C., with a high concentration of embassies, diplomatic missions, and diplomatic residences. It spans Massachusetts Avenue N.W. between 18th and 35th street, bounded by Scott Circle to the south and the United States Naval Observatory to the north; the term is often applied to nearby streets and neighborhoods that also host diplomatic buildings, such as Kalorama.