William Newnham (1790–1865) was a British physician.
In 1836, he became one of the first members of the Provincial Medical and Surgical Association (later called the British Medical Association).
He was also a member of the Royal Society of Literature.
[2] He was the author of Essay on Superstition (1830) which argued that apparitional experiences, dreams and spiritual visions had a physiological rather than a supernatural basis.
It was republished in 2010 by Cambridge University Press.