Carn Euny (from Cornish: Karn Uni) is an archaeological site near Sancreed, on the Penwith peninsula in Cornwall, England, United Kingdom with considerable evidence of both Iron Age and post-Iron Age settlement. Excavations on this site have shown that there was activity at Carn Euny as early as the Neolithic period. There is evidence that shows that the first timber huts there were built about 200 BC, but by the 1st century BC, these had been replaced by stone huts.