John McNeill (born 15 September 1933[1]) is a British and Canadian botanist and museum director who has worked particularly on the plant order Caryophyllales.

As an editor for the journal Taxon, he is involved with assessing proposals to conserve and reject botanical names.

[3] Since his retirement in 1999, Dr McNeill has served as Director Emeritus of the Royal Ontario Museum.

He is involved in the Flora of North America, acting as an editor, writer, and as a consultant on matters of botanical nomenclature related to the project.

He is a member of the American Society of Plant Taxonomists and he serves on the editorial board of Edinburgh Journal of Botany.