Hamburg (1895–1915) was an American Thoroughbred race horse. The leading American colt of his generation, Hamburg was retrospectively named the American Horse of the Year for 1898. After his racing career he went on to be a successful sire.

Elmendorf Farm is a Kentucky Thoroughbred horse farm in Fayette County, Kentucky, involved with horse racing since the 19th century. Once the North Elkhorn Farm, many owners and tenants have occupied the area, even during the American Civil War. Most of the land acquired during Haggin's era has since been sold off to neighboring stud farms, but the original 765 acres including the columns and many of the historic barns and houses still exist at Elmendorf.