The Mavourneen Rocks is a group of four steep, rocky islets that lie within Port Davey, an oceanic inlet, located in the south west region of Tasmania, Australia. The islets have a combined area of approximately 0.88 hectares (2.2 acres) and are contained with the Southwest National Park, part of the Tasmanian Wilderness World Heritage Site and the Port Davey/Bathurst Harbour Marine Nature Reserve.