Amelia Island is an island in Nassau County, Florida. One of the southernmost of the Sea Islands, a chain of barrier islands stretching along the east coast of the United States from South Carolina to Florida, it is 13 miles (21 km) long and approximately 4 miles (6.4 km) wide at its widest point. The communities of Fernandina Beach and Amelia City are both located on the island.

Named for Princess Amelia, daughter of George II of Great Britain, the island has changed hands between colonial powers a number of times. It is claimed that eight flags have flown over Amelia Island: French, Spanish, British, Patriot, Green Cross, Mexican, Confederate, and United States.