The Ike Dike is a proposed coastal barrier that, when completed, would protect the Galveston Bay in Texas, United States. The project would be a dramatic enhancement of the existing Galveston Seawall, complete with floodgates, which would protect more of Galveston, the Bolivar Peninsula, the Galveston Bay Area, and Houston. The barrier would extend across Galveston Island and the Bolivar Peninsula and would provide a barrier against all Gulf surges into the bay. The project is primarily the suggestion of Dr. Bill Merrell of Texas A&M University at Galveston. The Ike Dike would be able to withstand a 10000 year storm.

A flood barrier, surge barrier or storm surge barrier is a specific type of floodgate, designed to prevent a storm surge or spring tide from flooding the protected area behind the barrier. A surge barrier is almost always part of a larger flood protection system consisting of floodwalls, levees, and other constructions and natural geographical features.