The Breaksea Islands Group is a group of six islands, in the Southern Ocean, off the southwestern coast of Tasmania, Australia. Located near the mouth of Port Davey, the group comprise the North Breaksea and Main Breaksea Islands, the Fitzroy, Kathleen, and Munday islands, and the Mavourneen Rocks. The group have a total area of approximately 16 hectares (40 acres) and are contained within the Southwest National Park, part of the Tasmanian Wilderness World Heritage Site and the Port Davey/Bathurst Harbour Marine Nature Reserve.