The ABC Islands bear or Sitka brown bear (Ursus arctos sitkensis) is a subspecies or population of brown bear that resides in Southeast Alaska and is found on Admiralty Island, Baranof Island, and Chichagof Island in Alaska (colloquially known as the ABC Islands), and a part of the Alexander Archipelago. It has a unique genetic structure that relates them not only to brown bears, but also to polar bears. Its habitat exists within the Tongass National Forest, which is part of the perhumid rainforest zone.