William Wortley Baggally (1848 - 14 March 1928), most well known as W. W. Baggally was a British psychical researcher who investigated spiritualist mediums.
Baggally joined the Society for Psychical Research (SPR) in 1896 in the hope of finding evidence for life after death. Baggally was an amateur conjuror and had studied the trick methods of mediums.
In 1908, the SPR appointed a committee of three to examine the medium Eusapia Palladino in Naples. The committee consisted of Baggally, Hereward Carrington and Everard Feilding. Although the investigators caught Palladino cheating during the séances, they were convinced Palladino had produced genuine paranormal phenomena such as levitations of the table, movement of the curtains, movement of objects from behind the curtain and touches from hands. In 1909, all three investigators wrote a report on the medium in the Proceedings of the Society for Psychical Research.
Baggally was favourable of Palladino having attended séances before the 1908 investigation in Naples. According to the spiritualist Arthur Conan Doyle "Mr. W. W. Baggally, a member of the Council, had been investigating psychic phenomena for more than thirty-five years, and during that time—with the exception, perhaps, of a few incidents at a séance with Eusapia a few years before—had never witnessed a single genuine physical phenomenon."
Frank Podmore in his book The Newer Spiritualism (1910) wrote a comprehensive critique of their report. Podmore said that the report provided insufficient information for crucial moments and the investigators representation of the witness accounts contained contradictions and inconsistencies as to who was holding Palladino's feet and hands. Podmore found accounts among the investigators conflicted as to who they claimed to have observed the incident. Podmore wrote that the report "at almost every point leaves obvious loopholes for trickery." The psychologist C. E. M. Hansel criticized the report based on the conditions of the séances being susceptible to trickery. Hansel noted that they were performed in semi-dark conditions, held in the late night or early morning introducing the possibility of fatigue and the "investigators had a strong belief in the supernatural, hence they would be emotionally involved."