The Townsend House is a historic building on Embassy Row in Washington, DC.

The free-standing house, set in almost an acre of garden, was designed in the Beaux Arts French style by architects Carrère and Hastings in 1898 for Mary Scott Townsend, daughter of and heiress to William Lawrence Scott, and her husband Richard H. Townsend, moving from their previous home at 736 Jackson Place.

The house then became the home of their daughter, Mathilde Scott Townsend, and her husband since 1925, prominent diplomat Sumner Welles, until 1939 and again in 1943, even though they spent much time in Oxon Hill Manor and abroad.

The Cosmos Club purchased the property in 1950, following Mrs. Welles' death in Switzerland in 1949.

[3] This echoed the previous generation of Townsends' renting of their Jackson Place home to President Theodore Roosevelt in 1902, during the White House renovation and construction of the West Wing.