Ham Hill, Wiltshire

Ham Hill is a hill and area of chalk downland in Wiltshire, England, on the steep banks running alongside the road from the village of Ham to Buttermere, close to the Berkshire border. A biological Site of Special Scientific Interest, notified in 1971, covers 1.5 hectares of the site; this designation is due to the site's species-rich plant and insect communities, which include some rare species. Notable among these is the musk orchid (Herminium monorchis), which has been confirmed at only one other site in Wiltshire.

The site is managed as a nature reserve by Wiltshire Wildlife Trust. It is managed by grazing with sheep to prevent scrub encroachment and takeover by rank vegetation, which would otherwise crowd out the scarce plant species.