Arthur Boyd Hancock (June 26, 1875 - April 1, 1957) was a breeder of thoroughbred racehorses who established Claiborne Farm in Paris, Kentucky, United States. Born at Ellerslie Estate in Albemarle County, Virginia, near Charlottesville, Arthur Hancock was a brother to scholar and educator Harris Hancock (1867-1944). Their father, Capt. Richard Johnson Hancock, owned in Albemarle County and Arthur chose to follow in his father's footsteps. Racing in partnership with Major Thomas W. Doswell, Capt. Hancock won the 1884 Preakness Stakes with Knight of Ellerslie.