The Achnacree cairn is the remnant of a circular cairn on the northern edge of the Achnacree moor northeast of Oban Airport in Argyll and Bute in Scotland, which Audrey Henshall classified in 1972 as a Clyde Tomb-type passage tomb and excavated by J. N. Graham Ritchie.
The Cairn, deprived of the mass of its stones, hid, like most in the region, a passage tomb, of which only six bearing stones of the pear-shaped chamber and two of the four gang stones could be found in the excavation of Ritchie. It seems to have been built in two phases. Three chambers belong to the early period, the construction technique and plan of which correspond to a Clyde Tomb, which was covered with a small stone mound. Much later, a corridor appears to have been built over the original chambers and the east chamber added. The small central chamber, made up of five bearing stones, was older and had no capstones.