S. australis may refer to: Sauromalus australis, the Peninsular chuckwalla, a lizard species found in Mexico Schenkia australis, an annual herb species endemic to Australia Scolypopa australis, the passionvine hopper, an insect species found in Australia Scytothamnus australis, a brown alga species found in New Zealand Sloanea australis, the maiden's blush, a rainforest tree species found in Australia Smilax australis, the lawyer vine, barbwire vine or "wait-a-while", a plant species endemic to Australia Soroavisaurus australis, an enantiornithine bird species that lived during the Late Cretaceous of Argentina Suaeda australis, the austral seablite, a plant species native to Australia Syconycteris australis, the Common Blossom Bat, Southern Blossom Bat or Queensland Blossom Bat, a fruit bat species
See also Australis (disambiguation)