Annette Island or Taak'w Aan (Tlingit) is an island in the Gravina Islands of the Alexander Archipelago of the Pacific Ocean on the southeastern coast of the U.S. state of Alaska. It is at 55°08′06″N 131°27′21″W. It is about 18 km (11 mi) long and about 18 km (11 mi) wide. The land area is 332.573 km2 (128.407 sq mi). Annette Island is located west across the Revillagigedo Channel from the Alaska mainland and south of Revillagigedo Island. The Island was named in 1879 by William Healey Dall, an American naturalist and explorer in Alaska, in honor of his wife Annette Whitney Dall.

The Alexander Archipelago is a 300-mile (480 km) long archipelago in North America lying off the southeastern coast of Alaska. It contains about 1,100 islands, the tops of submerged coastal mountains that rise steeply from the Pacific Ocean. Deep channels and fjords separate the islands and cut them off from the mainland. The islands shelter the northern part of the Inside Passage as it winds its way among them.