Harry Sargeant III (born December 30, 1957) is a billionaire diversified energy and shipping magnate from Florida. A former officer and fighter pilot in the United States Marine Corps, Sargeant operates an expansive, multi-billion dollar conglomerate of private global enterprises consisting of aviation companies, oil refineries, oil trading operations, alternative fuels development, and oil and asphalt shipping, his Sargeant Marine Group being the largest fleet of asphalt tankers and barges in the world. He is also the owner of International Oil Trading Company (IOTC), a company that supplies aviation fuel to the U.S. Military in Iraq, and grosses billions of dollars annually.