Hogan Island is a granite island, with an area of 232 hectares (0.90 sq mi) and a high point of 116 metres (381 ft), in south-eastern Australia. It is the largest of Tasmania’s Hogan Group, lying in northern Bass Strait between the Furneaux Group and Wilsons Promontory in Victoria. The island was formerly used for the grazing of cattle, an activity which has ceased after causing considerable damage to the vegetation and the natural springs there.
Recorded breeding seabird and wader species include little penguin, short-tailed shearwater also known as the muttonbird, Pacific gull, silver gull and sooty oystercatcher. Reptiles present are the eastern blue-tongued lizard, metallic skink, three-lined skink, Bougainville's skink and White's skink. Goats were present for some time also.
The state border between Tasmania and Victoria lies in the Hogan Group and passes over land on the North East Islet, thus giving a land border between the two states. Before Victoria became a colony, it was agreed that New South Wales would have sovereignty of all the land to Bass Strait, and Tasmania would have Bass Strait, except for waters near the coast. The original intention was that these Bass Strait Islands would be part of Tasmania, but the surveyed position for Wilson's Promontory was slightly off, and the border placed too far south at 39°12' S. Once this was discovered the Islet was renamed to Boundary Islet. The land border is 85 metres (279 ft) long. 
- 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
- "Victoria Tasmania border". Geoscience Australia. Retrieved 2011-06-18.
- Boundary Islet on street-directory.com.au
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