Harold (foaled 1876 in Pennsylvania) was an American Thoroughbred racehorse.
Harold was a chestnut horse bred by Aristides Welch who owned both his sire and his dam.
B. who produced two other Classic winners: Iroquois, a full brother to Harold who became the first American-bred horse to ever win England's renowned Epsom Derby, plus the colt Panique by Alarm who won the 1884 Belmont Stakes.
Harold was acquired by the prominent New York stable owner, George L. Lorillard.
At age three, he won the Preakness Stakes, but in the ensuing Withers Stakes he suffered a ruptured blood vessel from which he never fully recovered and won only one more race before being retired to stud.