Danzig (February 12, 1977 – January 4, 2006) was an American Thoroughbred racehorse who is best known as a leading sire. He was purchased for $310,000 (equivalent to $1.3 million in 2021) by Henryk de Kwiatkowski at the 1978 Saratoga Yearling Sale. The son of Hall of Famer Northern Dancer and the most commercially successful sire of the second half of the 20th century, he won all three of his races before knee problems ended his racing career.