Toothill Fort, or Toothill Ring, or Toothill camp, is the site of an Iron Age univallate hill fort located in Hampshire. The site occupies an extremely strong position at the north end of a spur. Its defences comprise a single rampart and ditch with traces of a counterscarp bank in places. There is an additional scarp on the north side up to 2.0m in height where the site is weakest. The original entrance is onto the ridge to the south.