John Patrick Croxall CBE FRS (born 19 January 1946 in Birmingham) is a British biologist,^[1] and was Head of Conservation Biology at the British Antarctic Survey.^[2] He is Chair of Global Seabird Programme, of BirdLife International.^[3]

Croxall completed a PhD at the University of Auckland in 1971, on ascidian ecology, supervised by John Morton.^[4] He was senior research associate in zoology, at the University of Newcastle upon Tyne from 1972 to 1975. He won a Scientific Medal in 1984, from the Zoological Society of London.^[5] He received a President’s Medal from the British Ecological Society.^[6]