The red-crowned toadlet (Pseudophryne australis) is a species of Australian ground frog, restricted to the Sydney Basin, New South Wales.

This is a small species of frog, reaching 30 mm in length.

The sides are a blue-grey and there is a white mark in the armpits and thighs.

This species is only found around temporary creeks and soaks in sandstone habitats in woodland, heathland and dry sclerophyll forest around the Sydney basin.

Males make an ark call from nest sites under leaf litter and rocks, in areas likely to be inundated, generally only after heavy rain.