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.

An English country house is a large house or mansion in the English countryside. Such houses were often owned by individuals who also owned a town house. This allowed them to spend time in the country and in the city—hence, for these people, the term distinguished between town and country. However, the term also encompasses houses that were, and often still are, the full-time residence for the landed gentry who dominated rural Britain until the Reform Act 1832. Frequently, the formal business of the counties was transacted in these country houses, having functional antecedents in manor houses.