Dùn Dubh is a hillfort, located on the Inner Hebridean island of Coll. The fort is one of three associated with a local tradition which states that they were once the fortresses of Norsemen before being defeated by a Maclean chieftain. The early 20th century antiquary Erskine Beveridge considered it as one of the four most interesting fortifications, on Coll (along with Dùn an Achaidh, Dùn Anlaimh, and Dùn Morbhaidh).