Casterley Camp is the site of an Iron Age univallate hillfort in Wiltshire, England, about 1+1⁄2 miles (2.4 km) south-west of the village of Upavon.

The site comprises a large Iron Age/Romano-British enclosure, possibly non-defensive in function, and incomplete.

Three apparently related enclosures are identified within the site of Casterley Camp.

Since 1898, land immediately west and south has been part of the Salisbury Plain firing ranges.

[2] The site of a smaller Iron Age hill fort, Chisenbury Camp, lies on the other side of the River Avon valley, about 2+1⁄2 miles (4 km) to the east.