Arthur Boyd Hancock (June 26, 1875 - April 1, 1957) was a breeder of thoroughbred racehorses who established Claiborne Farm in Paris, Kentucky, United States.
Richard Johnson Hancock, owned Ellerslie Stud in Albemarle County and Arthur chose to follow in his father's footsteps.
Arthur Hancock expanded the Ellerslie Stud to his wife's Kentucky property and eventually transferred the bulk of his operation there.
Hancock was part of a 1936 consortium that imported Blenheim from England and in 1944 he purchased Princequillo who became the leading U.S. sire for 1957 and 1958.
In 2018, Arthur Hancock was posthumously voted into the National Museum of Racing and Hall of Fame as one of its esteemed Pillars of the Turf.