Maurice Beddow Bayly MRCS LRCP (26 March 1887 – 22 June 1961) was an English physician, anti-vivisection and anti-vaccination activist, and Theosophist, best known for his opposition to animal experimentation.

He was educated at St Dunstan's College, London University and Charing Cross Hospital.

[2] He worked at the National Anti-Vivisection Hospital with excellent conduct until an incident in 1912 when he was reprimanded for carrying out an unnecessary operation on a terminally ill breast cancer patient.

[4] Bayly opposed antitoxin treatment of Diphtheria cases as the research had been based on animal experiments.

[5] Bayly contributed a chapter on medicine to the 1938 book Where Theosophy and Science Meet, edited by D. D.