Ligia australiensis, the Australian marine slater, is a woodlouse in the family Ligiidae.
It can be found quite readily along the southern coast of Australia, including Tasmania, hiding under a huge variety of cover. It is not found as often on the coast of New South Wales, although it can be found in abundance in estuaries.
L. australienses is a frequent meal for the burrowing shore crab (Leptograpsodes octodentatus), occasionally for the sacred kingfisher (Todiramphus sanctus), and possibly the Pedra Branca skink (Niveoscincus palfreymani).