Addington long barrow is a badly damaged Neolithic chambered long barrow near Addington in the English county of Kent. It is one of a group of monuments known as the Medway megaliths.
It is rectangular long barrow measures 61 metres (200 ft) in length and varies from 14 metres (46 ft) to 11 metres (36 ft) in width as it narrows. It is oriented northeast–southwest. The edge of the barrow is marked by a kerb and the remains of the chamber may be indicated by a number of fallen stones at the northeastern end.
A road runs through the middle of the barrow and when it was expanded in 1827, two stones from the kerb were removed and placed in woodland south of the monument. In 1845, L.B. Larking, a local parson dug into the barrow, finding pieces of 'rough pottery'
In 1981, archaeologists surveyed the site identifying 25 original stones on all four sides of the structure, forming the kerb. A slight depression surrounding the mound may indicate the presence of a surrounding ditch. It and the nearby Chestnuts long barrow are open for public viewing by appointment with the landowner.
There is an official website at http://uk.geocities.com/addington.neolithATbtinternet.com/ which details background, location and access to both the Addington Longbarrow and the nearby Chestnuts burial chamber.