Deirdre (foaled 4 April 2014) is a retired Japanese Thoroughbred racehorse. As a two-year-old she raced six times, winning one minor race and running third in the Fantasy Stakes. In the following year she developed into a top-class performer in autumn as she took the Shion Stakes and Shuka Sho. As a four-year-old she won the Queen Stakes and the Fuchu Himba Stakes as well as being placed in both the Dubai Turf and the Hong Kong Cup. In 2019 she became the first Japan-trained horse in 19 years to win a major race in the United Kingdom when she won the Nassau Stakes. She retired from racing in November 2020 at the end of a season in which she did not win a race. Over her career she raced in eight countries.