Cow Castle is an Iron Age hillfort 5.75 kilometres (4 mi) West South West of Exford, Somerset, England within the Exmoor National Park. It is a Scheduled Monument. It has been added to the heritage at Risk register because of the risk from bracken.

It is situated on an isolated hilltop and has a single rampart and ditch, adapted to its location and enclosing 0.9 hectares, with a commanding position over the valley of the River Barle. It is 1.2 ha in area and surrounded by a rampart, up to 2m high.

It is in a good condition, and is expected to contain significant and environmental evidence. Legend says that the hillfort was built by fairies to protect themselves against the earth.

Hillforts developed in the Late Bronze and Early Iron Age, roughly the start of the first millennium BC. The reason for their emergence in Britain, and their purpose, has been a subject of debate. It has been argued that they could have been military sites constructed in response to invasion from continental Europe, sites built by invaders, or a military reaction to social tensions caused by an increasing population and consequent pressure on agriculture. The dominant view since the 1960s has been that the increasing use of iron led to social changes in Britain. Deposits of iron ore were located in different places to the tin and copper ore necessary to make bronze, and as a result trading patterns shifted and the old elites lost their economic and social status. Power passed into the hands of a new group of people. Archaeologist Barry Cunliffe believes that population increase still played a role and has stated "[the forts] provided defensive possibilities for the community at those times when the stress [of an increasing population] burst out into open warfare. But I wouldn't see them as having been built because there was a state of war. They would be functional as defensive strongholds when there were tensions and undoubtedly some of them were attacked and destroyed, but this was not the only, or even the most significant, factor in their construction".

• List of hill forts and ancient settlements in Somerset

• Adkins L and R, 1992. A Field Guide to Somerset Archaeology.
• Burrow E J, 1924. Ancients Earthworks and Camps of Somerset.
• Burrow I, 1981. Hillforts and Hilltop Settlements of Somerset.
• Grinsell L V, 1970. The Archaeology of Exmoor.
• Grinsell L V, 1976. Folklore of Prehistoric Sites in Britain.