Australosuchus is an extinct monospecific genus of crocodylian belonging to the subfamily Mekosuchinae. The type and only known species Australosuchus clarkae lived during the Late Oligocene and the Early Miocene of southern Australia. The generic name Australosuchus means "Southern crocodile". It was described in 1991 from fossil material discovered at Lake Palankarinna in South Australia. The below cladogram from the latest studies shows the placement of Australosuchus within Mekosuchinae: