Lady Wonder (February 9, 1924 – March 19, 1957) was a mare some claimed to have psychic abilities and be able to perform intellectually demanding tasks such as arithmetic and spelling.

[1] Lady was said to have predicted the outcome of boxing fights and political elections, and was consulted by the police in criminal investigations.

B. Rhine investigated Lady's alleged abilities and concluded that there was evidence for extrasensory perception between human and horse.

[11] Lady's celebrity grew across the United States when she was credited to have helped to solve the case of a missing 4-year-old boy, Danny Matson, in Quincy, Massachusetts.

The police chief William Ferrazzi tried to interpret Lady's message and wonder if she might mean "Field and Wilde Water Pit", a quarry close to Matson's house which had already been searched.

B. Rhine, one of the initial proponents of extrasensory perception, tested the psychic abilities of Lady Wonder, concluding that there was no evidence of either conscious or unconscious signaling by the researchers or Mrs. Fonda and that his results could be explained only using the "telepathic explanation".

[2] In a follow-up study, in December 1928, Rhine noticed Lady's telepathic abilities had been lost and that her answers depended heavily on Mrs. Fonda signaling the mare.