The Delaware Handicap is an American Thoroughbred horse race run annually in mid July at Delaware Park Racetrack in Wilmington, Delaware. The Grade 2 race is open to fillies and mares, age three and up, willing to race one and one-quarter miles on the dirt. The race was inaugurated as the New Castle Handicap as part of the racing schedule with the 1937 opening of Delaware Park Racetrack. In 1953, the new $100,000 purse offered by the New Castle Handicap made it the richest race in the world for fillies and mares. In 1955 it was renamed the Delaware Handicap.