Cockey Down (grid reference SU170317) is a 15.2 hectare biological Site of Special Scientific Interest in Wiltshire, notified in 1971.
The site is managed as a nature reserve by Wiltshire Wildlife Trust.
51°05′09″N 1°45′22″W / 51.085700°N 1.756128°W / 51.085700; -1.756128