King's Castle is an Iron Age enclosed hilltop settlement at the south-western edge of the Mendip Hills near Wells in Somerset, England. Though there are many prehistoric sites in the surrounding area, it remains one of the earliest known settlements in the immediate vicinity of Wells, and may have been a precursor to the present day city. It consists of two or three interlinked sub-enclosures, with what appears to be a field system extending to the east; an unusual layout, the site remains relatively little studied and has not been archaeologically excavated.