Souverain (foaled 1943) was a French Thoroughbred racehorse and sire. After winning his only race in 1945 he emerged as the leading European three-year-old of 1946 when his wins included the Grand Prix de Paris and the Prix Royal Oak in France and the King George VI Stakes in Britain. His success in the last race, in which he decisively defeated the British champion Airborne provoked widespread debate in Europe concerning the superiority of French horses in long distance events. As a four-year-old, Souverain added a victory in Britain's most valuable race, the Ascot Gold Cup. At the end of 1947 he was retired to stud where he had limited success as a sire of winners.