Stanmore Country Park is a 30.7-hectare public park, Local Nature Reserve and Site of Metropolitan Importance for Nature Conservation in Stanmore in the London Borough of Harrow. It is owned and managed by Harrow London Borough Council. The park was part of the grounds of an eighteenth-century mansion called Warren House. In 1937 it was acquired by Middlesex County Council and Harrow Urban District Council as public open space.