Austrochthonius australis is a species of pseudoscorpion in the Chthoniidae family. It is endemic to Australia. It was described in 1951 by American arachnologist Clayton Hoff.
The species occurs in both eastern and south-western Australia, inhabiting plant litter. The type locality is Mount Slide in Kinglake National Park, Victoria.
The pseudoscorpions are terrestrial predators.