Sidmouth Rock is an islet about 90 m in diameter, 2 km east of Eddystone and about 28 km south-east of South East Cape in Tasmania, Australia. It is frequently wave-washed and supports no land-dwelling life.[1] It is part of the Southwest National Park and thus part of the Tasmanian Wilderness World Heritage Site.
Together with the nearby Eddystone and Pedra Branca the islet constitutes the 2 ha Pedra Branca Important Bird Area (IBA), identified as such by BirdLife International because it supports over 1% of the world populations of Shy Albatrosses and Australasian Gannets.[2]