Preakness (1867–1881) was an American Thoroughbred racehorse. He was sired by the famed leading sire Lexington out of a mare named Bay Leaf. Preakness was from Milton Holbrook Sanford's Preakness Stud in Preakness, Wayne Township, New Jersey.

Lexington was a United States Thoroughbred race horse who won six of his seven race starts. Perhaps his greatest fame, however, came as the most successful sire of the second half of the nineteenth century; he was the leading sire in North America 16 times, and broodmare sire of many notable racehorses.