Wetria australiensis is a species of plant in the family Euphorbiaceae, native to Papua New Guinea and the state of Queensland, Australia. It is a small tree to about tall, first described in 1994 by New Zealand-born botanist Paul Irwin Forster.
The species is known from a very small area of rainforest just west of Cairns, Queensland, and two isolated occurrences in Papua New Guinea. When first described it was only known from the site near Cairns.
, this species has been assessed to be endangered by the International Union for Conservation of Nature (IUCN) and critically endangered by the Queensland Government under its Nature Conservation Act.