Hartwell House is a country house in the parish of Hartwell in Buckinghamshire, Southern England. The house is owned by the Ernest Cook Trust, has been a Historic House Hotel since 1989, and in 2008 was leased to the National Trust. The Grade I listed house is Jacobean with a Georgian front and Rococo interiors, set in a picturesque landscaped park, and is most famous as the home of exiled French king Louis XVIII in the early 19th century.

Louis XVIII, known as the Desired, was King of France from 1814 to 1824, except for a brief interruption during the Hundred Days in 1815. He spent 23 years in exile from 1791: during the French Revolution and the First French Empire (1804–1814), and during the Hundred Days.