David William "Dave" Sime (July 25, 1936 – January 12, 2016) was an American sprinter. He ranked as one of the fastest humans of all time. He held many sprint records during the late 1950s. He won a silver medal at the 1960 Summer Olympics in Rome, Italy. He later became an ophthalmologist (type of eye doctor) and pioneer of intraocular lens transplants.