Amanita australis is a species of fungus in the Amanitaceae family. It is found only in New Zealand, where it occurs in Leptospermum and Nothofagus forest. The species was first described by New Zealand mycologist Greta Stevenson in 1962; in the same publication Stevenson also described what she thought was a unique species, Limacella macrospora, but over 30 years later this was reduced to synonymy with A. australis.