Richard O. "Dick" Miller (1875 - June 11, 1930) was an American jockey and a trainer of two National Champion Thoroughbred racehorses. In 1890 Richard Miller went to work as an exercise rider for the prominent stable owner Michael F. Dwyer. He would ride for the stable for a short time before choosing to learn the business of training Thoroughbreds under the very capable Hardy Campbell Jr. In June 1895 Hardy Campbell Jr. died and Richard Miller took over.