John McNeill (born 15 September 1933) is a British and Canadian botanist and museum director who has worked particularly on the plant order Caryophyllales. In 1960, he received a Ph.D. from the University of Edinburgh for his thesis on “Taxonomic studies in the Alsinoideae”. As a nomenclature specialist, he has provided editorial guidance for journals and book series, and has served as a member of the Editorial Committee of the International Code of Botanical Nomenclature and the International Code of Nomenclature for algae, fungi, and plants since the XIII International Botanical Congress in 1981.
