Dahlia (March 25, 1970 – 6 April 2001) was an American-bred Thoroughbred racehorse and broodmare. She won major races in France, England, Ireland, Canada, and the United States. She was the first Thoroughbred mare to earn more than $1 million and was one of the pioneers of inter-continental racing.
Originally trained in France, she showed early promise by winning the Prix Yacowlef on her debut as a two-year-old but failed to win again that year. In the following season she developed into a top-class middle-distance performer, winning the Prix de la Grotte, Prix Saint-Alary and Irish Oaks against her own sex before defeating male opposition King George VI and Queen Elizabeth Stakes, Prix Niel and Washington, D.C. International. She was voted British horse of the year and was the equal-top-rated three-year-old filly in Europe. In the following year she won a second King George VI and Queen Elizabeth Stakes as well as the Grand Prix de Saint-Cloud, Benson and Hedges Gold Cup, Man O' War Stakes and Canadian International Stakes. She was voted British horse of the year for a second time and took the Eclipse Award for Champion Turf Horse. She was less successful at five but did record an upset victory over Grundy to take a second Benson and Hedges Gold Cup. She was transferred to the United States and won the Hollywood Invitational Handicap.