Badger Island is a low-lying granite and limestone island, with an area of 1242 ha, in south-eastern Australia. It is part of Tasmania’s Badger Island Group, lying in eastern Bass Strait just west of Flinders and Cape Barren Islands in the Furneaux Group. The island is private property and is extensively grazed by livestock and macropods. It contains a homestead, jetty and airstrip. It is also part of the Chalky, Big Green and Badger Island Groups Important Bird Area.

Badger's Island is located in the Piscataqua River at Kittery, Maine, directly opposite Portsmouth, New Hampshire. It carries U.S. Route 1 between the states, connecting to the Kittery mainland by the Badger's Island Bridge, and to New Hampshire by the Memorial Bridge. Now largely a suburb of Portsmouth, the island features houses, condominiums, restaurants and marinas.