Go Marching (1965 – August 10, 1994) was an American Thoroughbred racehorse who was sired by the outstanding Champion sire Princequillo and out of the Champion racemare, Leallah. Bred by Charlton Clay at his near Paris, Kentucky, Go Marching was sold to as an unnamed two-year-old colt in a May 1967 Fasig-Tipton sale at Belmont Park for a record price of $210,000.