Douglas Island is a tidal island in the U.S. state of Alaska.
Douglas Island may also refer to:
Douglas Island (British Columbia), Canada Douglas Island (Western Australia), see List of islands of Western Australia, D-G Douglas Island (Nunavut), Canada, between Dolphin and Union Strait and Coronation Gulf and Cape Krusenstern (southwest) and Lady Franklin Point (northeast) Douglas Islands, in Antarctica Protection Island (Nanaimo), formally named Douglas Island