Cape Barren Island (indigenous name: Truwana) is located off the north east coast of Tasmania, Australia, and is one of the islands of the Furneaux Group in Bass Strait. The largest island of the group, Flinders Island, lies to the north, with the smaller Clarke Island to the south. The highest point on the island is Mount Munro at 715 metres. Mount Munro is probably named after James Munro (ca. 1779-1845), a former convict and then sealer, who lived from the 1820s for more than 20 years with several women on nearby Preservation Island.
The south-eastern point of the island was named Cape Barren by Tobias Furneaux in in March 1773.
The island has an area of . The population of the island numbered 268 in 2006, most of them in the settlement Cape Barren Island, also called The Corner, on the northwest coast.
Australia's only native goose, the Cape Barren Goose, was first sighted on this island.