William Henry Mayne M.D., L.R.C.S., (ca. 1816 – 25 December 1857) was a British orthodox physician who converted to homeopathy. Mayne was a member of the British Homeopathic Society from its inception in 1844. Mayne was a member of the Medical Council of the London Homeopathic Hospital, a Medical Officer at the Westminster and Lambeth Homeopathic institute and Dispensary with Edward Hamilton and Joseph Laurie, and at the West End Homeopathic Dispensary with Jones and Guthrie, and Assistant Demonstrator at the Blenheim Street School of Medicine founded by surgeon and naturalist Joshua Brookes.

Mayne was a student of Paul Francois Curie, alongside Thomas Engall, John Ozanne, Samuel Thomas Partridge, and Graf von Viettinghoff.

Mayne practiced in London in the 1840s, and in Ipswich in the 1850s at Neal Street. Also practicing in Ipswich at that time were homeopaths George Mayne MD, MRCS [England 1832], and Henry Robertson.

William Henry Mayne wrote On the use of Caster oil as a powerful Anti Spasmodic, with satisfactory results from its use in cholera, diarrhoea and dry bellyache, On the use of the accustomed stimulus in delerium tremens.

Mayne died suddenly on 25 December 1857. His Ipswich practice was subsequently taken over by William Gwynn.

Of interest:

George Mayne MD, MRCS [England 1832] [a possible relation] practiced in Ipswich in the

J. Mayne M. D. was a Steward at the Annual Festival in aid of the funds of the Charity, and in commemoration of the opening of the London Homeopathic Hospital on Thursday, the 10th of April 1851.