This paper presents a newly-compiled diachronic corpus of Australian English (AusBrown). With four sampling time points (1931, 1961, 1991 and 2006), Aus-Brown is designed to match the current suite of British and American ‘Brown-family’ corpora in both sampling year and design. We provide details of the composition and compilation of AusBrown, and explore the broader context of its ‘Brown-family background’ and of complementary Australian corpora. We also overview research based on the Australian corpora presented, including several AusBrown-based papers.