Flagler Memorial Island is an uninhabited artificial island of South Beach in the city of Miami Beach in Biscayne Bay, Florida. A 110-foot (34 m) high obelisk with allegorical sculptures at its base stands as a monument to Miami pioneer Henry M. Flagler, and was built in the center of the freshly constructed island in memory of Flagler, who died in 1913.

Henry Morrison Flagler was an American industrialist and a founder of Standard Oil, which was first based in Ohio. He was also a key figure in the development of the Atlantic coast of Florida and founder of the Florida East Coast Railway. He is also known as a founder of the cities of Miami and Palm Beach, Florida.