Tregiffian Barrow is a chamber tomb dating back to the Neolithic era located in the English county of Cornwall. The megalithic stones that were used for its construction are still there to this day and it is estimated to be dating from 3000 BC - 2000 BC. The site is located near the Merry Maidens stone circle. The majority of the chambered tomb was destroyed in the 19th century during construction of the road that runs right past the site.