Park Farm Down is a designated Site of Special Scientific Interest (SSSI) to the North west of Upper Lambourn in Berkshire. It is located within the North Wessex Downs.
The site is 3.3 hectares in size. The site features an area of scattered sarsen stones which are now extremely rare on the Berkshire Downs.
In 1982 the site was designated a site of special scientific interest (SSSI).
The site has the following Fauna: