Matachia australis is a species of Desidae spider that is endemic to New Zealand.
This species was described by Ray Forster in 1970 from male and female specimens.
The male is recorded at 6.8mm in length whereas the female is 7.05mm.
This species is only known from the south of the South Island of New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".