John Tomac (born November 3, 1967, in Owosso, Michigan) is an American former professional cyclist who competed from 1985 to 2005. He was a versatile rider who competed in multiple disciplines including; BMX racing, cross-country, road racing, trials riding and downhill racing. Tomac became a mountain bike racing icon in the late 1980s as the sport began to develop beyond its formative years. At the time of his retirement in 2005, he had won more mountain bike races than anyone in the sport. In 1991 he was inducted into the Mountain Bike Hall of Fame and, in 2004 he was inducted into the United States Bicycling Hall of Fame.