Maurice Beddow Bayly (26 March 1887 – 22 June 1961) was an English physician, anti-vivisection activist, and anti-vaccination campaigner.
He was a member of the National Anti-Vaccination League, the Animal Defence and Anti-Vivisection Society, and the English section of the Theosophical Society.Bayly was born in Woolwich.
He was educated at St Dunstan's College, London University and Charing Cross Hospital.
He was one of the few prominent doctors advocating anti-vivisection in the post-war period.