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, United States.

The first lighthouse on Sand Island, constructed by Winslow Lewis in 1837, was a 55-foot (17 m) structure completed in 1839.

[5] In 1859 a new lighthouse was completed but was destroyed during the Civil War, on February 23, 1863, by Confederate John W. Glenn.

Both lighthouses were on eroded sandy islands, leaving the towers surrounded by water.

1,400,000 yards (1,300,000 m) of sand was dredged from the sea floor and deposited around the lighthouse creating a 2,600-foot (790 m) by 500-foot (150 m), or approximately 15-acre (6.1 ha), island.