Broadbury Castle () is an archaeological earthwork close to Beaworthy in Devon, England.
The site comprises a single bank and ditch which enclose an almost square piece of ground measuring across. Historic England state that it is the remains of a Roman marching camp, although firm evidence for this is lacking and an alternative interpretation as an Iron Age or Roman-British civilian settlement has also been proposed.
The site is legally protected as a scheduled monument, under the Ancient Monuments and Archaeological Areas Act 1979
Broadbury Castle was a familiar place for fox hunting, with Devon newspaper accounts stretching over fifty years.