| Hardwell Castle | |
| Other Name: | Hardwell Camp |
| Type: | Hillfort |
| Coordinates: | 51.5784°N -1.5872°W |
| Designation1: | Scheduled monument |
| Designation1 Offname: | Hardwell Camp promontory fort |
| Designation1 Date: | 18 August 1958 |
| Designation1 Number: | 1017820 |
Hardwell Castle or Hardwell Camp is an Iron Age valley fort in the civil parish of Compton Beauchamp in Oxfordshire (previously Berkshire).[1]
Like nearby Cherbury Camp, it is not clearly in a strategic or easily defended position. It lies halfway down the scarp slope of the White Horse Hills and is tucked away in a curve, invisible from most angles. This particular positioning suggests its builders had a specialist purpose in mind, although exactly what that may have been remains a mystery. It is also surrounded by a double vallum: its dimensions 140 by 180 ft.[2] It is 'multi-vallate', like Cherbury Camp. It is unexcavated and therefore very little is known about it. The site is described as a promontory fort by Historic England, and has been a Scheduled Monument since 1958.
The site is at in the Vale of White Horse, very close to the small settlements of both Compton Beauchamp and Knighton, 2 miles from Uffington and 1 mile from the hilltop Uffington Castle.