Sand Island Light, also known as Sand Island Lighthouse (and historical light station), is a decommissioned lighthouse located at the southernmost point of the state of Alabama, United States, near Dauphin Island, at the mouth of Mobile Bay, Alabama. It is located roughly 3 miles offshore from the primary Mobile Bay entrance, bounded on the east by Mobile Point and on the west by Dauphin Island. The lighthouse is 132 feet (40 m) high.