Dunachton (Scottish Gaelic: Dùn Neachdain) is an estate on the north-west shore of Loch Insh in Badenoch and Strathspey, in the Highlands of Scotland.

Recent research has suggested Dunachton as a potential location for the Battle of Dun Nechtain in 685 in which the Picts permanently secured independence from the Northumbrians.

The area around Dunachton shows evidence of human occupation in prehistory, with flintwork and whetstones being found in the vicinity.

In 2010 the Dutch archaeologist Lex Ritman informed the resident of Dunachton Lodge that the stone was fallen.

Dunachton Castle was destroyed the following year by Coll MacDonald under the auspices of the Jacobite cause, provoking a public rebuke from Dundee.