John Alan (Jack) Elix (born 1941)[1] emeritus professor in chemistry at the Australian National University,[2][3] is an organic chemist who has contributed in many fields: lichenology, lichen chemotaxonomy, plant physiology[2] and biodiversity and natural product chemistry.

[8] Elix spent a post doctoral year in 1966 at Cambridge, returning to Australia in 1967 to a lectureship in chemistry at the ANU.

[1] He is a prolific author (or coauthor) of new fungal and lichen species, having formally described about 1147 as of December 2017.

[15] He was honoured in 1997, when lichenologist Helge Thorsten Lumbsch published Elixiaceae which is a family of fungi in the order Umbilicariales.

It contains two genera, Meridianelia, and the type genus, Elixia, which is named after John Alan Elix.