Cairndow (Scottish Gaelic: An Càrn Dubh) is a coastal hamlet in southwest Scotland.
Cairndow lies between the A83 road and the head of Loch Fyne. Administratively it forms part of the Argyll and Bute council area.
Cairndow's school closed in 1988 after the roll fell to just 3 pupils. Now children in the area are sent to the primary school in Strachur and the secondary school in Dunoon. Medical facilities for the hamlet are provided by the GP in Strachur.
Coordinates: 56°15′14″N 4°56′22″W / 56.25384°N 4.93945°W / 56.25384; -4.93945