The Turnbull government presented Australia's fifth national multicultural policy statement in March 2017. This article analyses the policy statement and argues that it represents the most significant change to Australian multicultural policy in four decades. Among other things, it abandons the language of government responsiveness to cultural diversity that previously defined Australian multiculturalism. The 2017 policy amounts to a new form of post-multiculturalism-different from earlier conservative, neoliberal and centre-left versions-in that it seeks to 'mainstream' multicultural policy on the grounds that Australian multiculturalism has succeeded in its intended task. While a mainstreaming strategy of this sort is, I argue, theoretically consistent with Australia's liberal nationalist approach to cultural diversity, the institutional and attitudinal conditions that it presupposes are yet to be fully realised in Australia. More multicultural work needs to be done before this kind of post-multiculturalist approach is practicable.