Winfield House is an English townhouse in Regent's Park, central London and the official residence of the United States Ambassador to the United Kingdom. The grounds are 12 acres (4.9 ha), the largest private garden in London save for that of Buckingham Palace.

Decimus Burton was one of the foremost English architects and landscapers of the 19th century. He was the foremost Victorian architect in the Roman revival, Greek revival, Georgian neoclassical and Regency styles. He was a founding fellow and vice-president of the Royal Institute of British Architects, and from 1840 architect to the Royal Botanic Society, and an early member of the Athenaeum Club, London, whose clubhouse he designed and which the company of his father, James Burton, the pre-eminent Georgian London property developer, built.