Conwy Lloyd Morgan, FRS (6 February 1852 – 6 March 1936) was a British ethologist and psychologist. He is remembered for his theory of emergent evolution, and for the experimental approach to animal psychology now known as Morgan's canon, a specialised form of Occam's razor which played a role in behaviourism, insisting that higher mental faculties should only be considered as explanations if lower faculties could not explain a behaviour.
Lloyd Morgan was born in London and studied at the Royal School of Mines and subsequently under T. H. Huxley. He taught in Cape Town, but in 1884 joined the staff of the then University College, Bristol as Professor of Geology and Zoology, and carried out some research of local interest in those fields. But he quickly became interested in the field he called "mental evolution", the borderland between intelligence and instinct, and in 1901 moved to become the college's first Professor of Psychology and Education.
As well as his scientific work, Lloyd Morgan was active in academic administration. He became Principal of the University College, Bristol, in 1891 and played a central role in the campaign to secure it full university status. In 1909, when, with the award of a Royal Charter, the college became the University of Bristol, he was appointed as its first Vice-Chancellor, an office he held for a year before deciding to become Professor of Psychology and Ethics until his retirement in 1919. He was president of the Aristotelian Society from 1926 to 1927.