Birch Grove was the family mansion of former British prime minister Harold Macmillan, Earl of Stockton, who died there in 1986. It is on the edge of Ashdown Forest near Chelwood Gate in East Sussex, England (though the house itself is in West Sussex). The house is now owned by James Hay. 
The house was built in 1926 for Maurice and Helen Macmillan, parents of the future prime minister, and is Grade II listed. It was reported to have been sold in 2011 for £25 million to Jim Hay, having been owned by Chinese businessman Larry Yung.
- Eden, Richard (6 November 2015). "Carole Middleton's racehorse-owning friend Dr Jim Hay buys Harold Macmillan's former home" (Press release). The Telegraph. Retrieved 5 September 2014.
- "President Kennedy slept in our parish". HorstedKeynes.com. Retrieved 20 November 2013.
- "Birch Grove House, Horsted Keynes". British Listed Buildings. Retrieved 20 November 2013.
- Eden, Richard (6 November 2011). "Carole Middleton's racehorse-owning friend Dr Jim Hay buys Harold Macmillan's former home". Daily Telegraph. Retrieved 20 November 2013.
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