Hatfield House is a Grade I listed country house set in a large park, the Great Park, on the eastern side of the town of Hatfield, Hertfordshire, England. The present Jacobean house, a leading example of the prodigy house, was built in 1611 by Robert Cecil, 1st Earl of Salisbury and Chief Minister to King James I. It is a prime example of Jacobean architecture. The estate includes extensive grounds and surviving parts of an earlier palace. The house is currently the home of Robert Gascoyne-Cecil, 7th Marquess of Salisbury. It is open to the public.

Robert Michael James Gascoyne-Cecil, 7th Marquess of Salisbury, Baron Gascoyne-Cecil, is a British Conservative politician. From 1979 to 1987 he represented South Dorset in the House of Commons, and in the 1990s he was Leader of the House of Lords under his courtesy title of Viscount Cranborne. Lord Salisbury lives in one of England's largest historic houses, the 17th-century Hatfield House in Hertfordshire, and currently serves as Chancellor of the University of Hertfordshire.