Gary M. Fanelli (born October 24, 1950) is a long-distance runner from the United States who represented American Samoa in the marathon at the 1988 Summer Olympics in Seoul, South Korea. Fanelli's 2:25:35 performance at the Olympics is an American Samoan national record. Known for running in costume, he has been called "the crown prince of road racing", "the king of costume", and "road-racing's longest-running joke".