The Oxford Guide to Australian Languages is a wide-ranging reference work that explores the more than 550 traditional and new Indigenous languages of Australia. Australian languages have long played an important role in diachronic and synchronic linguistics and are a vital testing ground for linguistic theory. Until now, however, there has been no comprehensive and accessible guide to the their vast linguistic diversity. This volume fills that gap, bringing together leading scholars and junior researchers to provide an up-to-date guide to all aspects of the languages of Australia. The chapters in the book explore typology, documentation, and classification; linguistic structures from phonology to pragmatics and discourse; sociolinguistics and language variation; and language in the community. The final part offers grammatical sketches of a selection of languages, sub-groups, and families. At a time when the number of living Australian languages is significantly reduced even compared to twenty year ago, this volume establishes priorities for future linguistic research and contributes to the language expansion and revitalization efforts that are underway.