We reviewed Australian mental health legislation to determine what obligations it places on psychiatrists to facilitate second opinions for compulsory patients who request them. Only four jurisdictions-Australian Capital Territory, Queensland, Victoria, and Western Australia-have legislated for 'patient-initiated' second opinions. Within these four regimes, there is variation in important aspects of the second opinion process, and there is a general absence of direction given to the second opinion providers. Based on research showing the variability of second opinion provision under New Zealand mental health legislation, we argue that this absence is likely to result in significant variation in the quality and depth of second opinions provided in Australia. We argue that New South Wales, the Northern Territory, South Australia, and Tasmania should consider formal provision for patient-initiated second opinions in their mental health legislation. We believe that such legislation ought to be aware of the barriers patients may face in accessing second opinions, and avoid exacerbating these barriers as Queensland's legislation appears to. Also, we argue that research on current practice in Australia should be conducted to better understand the effects of legislation on second opinions, and to help determine what amounts to best practice.