Silverbulletday (foaled January 22, 1996 in Kentucky) is an American Thoroughbred Champion racehorse. Bred in Kentucky, she was sired by Silver Deputy and out of the GII winning mare Rokeby Rose. Her damsire was Tom Rolfe, the 1965 Preakness Stakes winner and that year's U.S. Champion 3-Yr-Old Colt. Her grandsire was Deputy Minister, the 1981 Canadian Horse of the Year and a very important North American sire.