Castle Goff is an enclosure about south-west of Camelford, in Cornwall, England. It is a scheduled monument.
Castle Goff is considered to be a "round": these are small circular embanked enclosures, with one entrance; they date from the late Iron Age to the early post-Roman period. They are most common in Cornwall.
It is situated on the southern edge of a ridge between two tributaries of the River Allen. Its diameter is about . The rampart is above the interior, and above the external ditch, which is about wide and deep.
From the original western entrance, which is now blocked, there is a causeway to an annexe to the west. The annexe, north to south, is a rampart and outer ditch; the ends do not encroach on the ditch of the main earthworks, suggesting that it was a later construction. The rampart of the annexe is partly incorporated into the present field boundary.
Another round, Delinuth Camp, is about to the north-west.