Wild Illusion (foaled 18 February 2015) is a British Thoroughbred racehorse. She was the highest-rated horse of her age and sex trained in Britain in 2017 when she won two of her three races including the Group 1 Prix Marcel Boussac. In the following year she finished fourth in the 1000 Guineas and second in the Epsom Oaks before winning the Nassau Stakes and the Prix de l'Opéra.