Oribatid mites are ancient, minute arthropods that live in soil, plant litter, mosses and lichens, and on trees and shrubs. Prior to the production of this catalogue, Australian Oribatid mites had been poorly documented. This catalogue summarises our knowledge of the fauna of Australian Oribatid mites, including many new records of species and genera. It forms a fundamental resource for anyone interested in these important organisms and their role in soil ecology and as environmental indicators.