Northern Ireland, like the rest of the British Isles, is dotted with hillforts. The Atlas of Hillforts of Britain and Ireland lists thirty-two such forts. These are classically defined as small hilltop settlements fortified with earthworks, but many are not located on hills, and probably did not function as forts. Their function is unclear; although conventionally interpreted as defensive fortifications and centres of economic political power, there is little evidence that they were ever attacked, and more recent scholarship has suggested that they may be better interpreted as monuments.
County Antrim Ballygill North (Rathlin Island) (), promontory fort Carncoagh (), contour fort Carnduff (), promontory fort Carravindoon (Rathlin Island) (), promontory fort Carrickagile (Rathlin Island) (), promontory fort Derrynaseer (), contour fort Dooninish (), promontory fort Dunineny Castle (), promontory fort Dunmull (), partial contour fort Galboly Lower (), promontory fort Knockdhu (), promontory fort Larrybane (), promontory fort Lurigethan (), promontory fort Lyles Hill (), partial contour fort McArt's Fort (), promontory fort
County Armagh Forkill (), contour fort Haughey's Fort (), multiple enclosure hillfort Lisbanoe (), multiple enclosure hillfort
County Down Coolnacran in Whyte's Estate, Loughbrickland. Downpatrick (), contour fort Dromorebrague (), contour fort Lisnagade (), earthen ringfort Magheraknock (), contour fort
County Fermanagh Doagh Glebe (), promontory fort
County Londonderry Dungannon Fort (), promontory fort Tintagh (), promontory fort
County Tyrone Aghnahoo (), multiple enclosure hillfort Cabragh Fort (), contour fort Clogher (), contour fort Clogher Demesne (), contour fort Freughmore (), contour fort Lisbancarney (), multiple enclosure hillfort Mallabeny (), contour fort Tycanny (), partial contour fort
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