Swainson Island is an island, with an adjacent islet, with a combined area of 4.14 ha, in south-western Tasmania. It is part of the Swainson Island Group, lying close to the southern end of the western coast of Tasmania. It is also part of the Southwest National Park, and thus within the Tasmanian Wilderness World Heritage Site. The island is part of the Port Davey Islands Important Bird Area, so identified by BirdLife International because of its importance for breeding seabirds. 
Recorded breeding seabird and wader species are the little penguin (100 pairs), short-tailed shearwater (38,000 pairs), fairy prion (3000 pairs), Pacific gull and sooty oystercatcher. The Tasmanian tree skink is present.
- Brothers, Nigel; Pemberton, David; Pryor, Helen; & Halley, Vanessa. (2001). Tasmania’s Offshore Islands: seabirds and other natural features. Tasmanian Museum and Art Gallery: Hobart. ISBN 0-7246-4816-X
- Small Southern Islands Conservation Management Statement 2002 (PDF), Tasmania Parks and Wildlife Service, 2002, archived from the original (PDF) on 2006-08-22, retrieved 2006-07-20
- "IBA: Port Davey Islands". Birdata. Birds Australia. Retrieved 2011-09-19.
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