The Devil's Den or Devil's Den is a dolmen burial chamber on Fyfield Hill near Marlborough, Wiltshire, England.

The chamber is part of a neolithic passage grave on Fyfield Down.

Two standing stones, a capstone and two fallen stones are all that remain of what was the entrance to a long mound, described in the 1920s as being around 230 ft long (70 metres).

[1][3] The dolmen was named after the devil, along with many other prehistoric remains, after the coming of Christianity.

[4] A local tradition said that if water was poured into hollows on the capstone, a demon would come in the night and drink it.