Sugarloaf Rock is a steep, rocky unpopulated islet located close to the south-western coast of Tasmania, Australia.

Situated some 2 kilometres (1.2 mi) south of where the mouth of Port Davey meets the Southern Ocean, the 3.56-hectare (8.8-acre) islet is one of the eight islands that comprise the Mutton Bird Islands Group.

Sugarloaf Rock is part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site.

[1][2] The island is part of the Port Davey Islands Important Bird Area, so identified by BirdLife International because of its importance for breeding seabirds.

[3] Recorded breeding seabird and wader species are the short-tailed shearwater (15,000 pairs), fairy prion (2000 pairs), silver gull and sooty oystercatcher.