Curtis Island is a granite island, with an area of 150 ha, in south-eastern Australia. It is part of Tasmania’s Curtis Group, lying in northern Bass Strait between the Furneaux Group and Wilsons Promontory in Victoria. It is a nature reserve and has been identified as an Important Bird Area because it supports up to 390,000 breeding pairs of short-tailed shearwaters or Tasmanian muttonbirds.