Dunnicaer, or Dun-na-caer, is a precipitous sea stack just off the coast of Aberdeenshire, Scotland, between Dunnottar Castle and Stonehaven.

Sited between Stonehaven and the similarly situated Dunnottar Castle, the sea stack is in Strathlethan Bay, with Downie Point to the north and just offshore from the cliffs at Bowdun Head to the south.

[1][4][11] The discoveries suggest that the fort was a substantial, high-status building, with stone and oak timbers brought in from a distance.

[18][21][note 4] They were illustrated in John Stuart's 1856 and 1867 volumes of The Sculptured Stones of Scotland published by the Spalding Club.

[4][14] – this is a much earlier date than the conventional view that the simplest and earliest (Class I) stones are from the fifth or even seventh century AD.