Flat Top Island is a 1.58 ha island in south-eastern Australia. It is part of the Maatsuyker Island Group, lying close to the southern end of the south-western coast of Tasmania. It is also part of the Southwest National Park, and thus within the Tasmanian Wilderness World Heritage Site.[1] The island is part of the Maatsuyker Island Group Important Bird Area, identified as such by BirdLife International because of its importance as a breeding site for seabirds.[2]
Recorded breeding seabird species are the Short-tailed Shearwater (400 pairs), Fairy Prion (5000 pairs), Common Diving-Petrel (1000 pairs) and Pacific Gull. The island is a haul-out site for the Australian Fur Seal. The Tasmanian Tree Skink is present.[1]