The Atlas of Hillforts of Britain and Ireland was an online database of hillforts―fortified settlements built in the Bronze Age and Iron Age―in the British Isles. It was compiled by researchers from the University of Edinburgh, the University of Oxford and University College Cork, led by Ian Ralston and Gary Lock. On its launch in 2017 the atlas had 4,147 entries, which the researchers believe to be all of the extant hillforts in Britain and Ireland. A printed atlas is also planned.