Williams Island may refer to several places:
Williams Island Dam, in Richmond, Virginia, United States Williams Island (South Australia), located south-east of Port Lincoln, Australia Williams Island Formation, a geologic formation in Ontario, Canada Williams Island (Florida), a section of Aventura, Florida, United States Williams Island (Antarctica), off Thurston Island Williams Rocks, a group of islands in Antarctica
See also King William Island, an island in the Kitikmeot Region of Nunavut, which is part of the Canadian Arctic Archipelago