Michael Calvert Appleby OBE is a British ethologist and animal welfare scientist, especially for farm animals. He obtained a BSc in Zoology at the University of Bristol and a PhD in Animal Behaviour at King's College, Cambridge. He then spent 20 years at the Poultry Research Centre in Scotland and the University of Edinburgh researching behaviour, husbandry, and welfare of farm animals. He worked for World Animal Protection (previously WSPA) from 2005–2016, and is now retired.