Kathleen Island is a steeply cliffed island, with an area of 11.35 ha and a height of 72 m, in south-eastern Australia. It is almost split by a deep gulch. It is part of the Breaksea 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. 
Most of the island is covered by thick scrub and rainforest. Recorded breeding seabird species are the Little Penguin (1-200 pairs) and Short-tailed Shearwater (67,000 pairs). Burrowing seabirds have caused erosion in places. The Metallic 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, Tasmania Parks and Wildlife Service, 2002, archived from the original on 2006-08-22, retrieved 2006-07-20
- "IBA: Port Davey Islands". Birdata. Birds Australia. Retrieved 2011-09-19.
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