The last 15 years have seen many developments in Australian public interest disclosure or ‘whistleblower protection’ legislation. Since 1993, every Australian public law jurisdiction has enacted or introduced such legislation, and in 2004 comparable provisions were extended into Australian corporate law, and to a lesser extent workplace relations (2007). Further, the new Commonwealth Labor government has committed to introduce new ‘best practice’ public interest disclosure legislation for federal officials. This article presents key results from a comparative analysis of existing legislative regimes, focusing on five issues: who may disclose wrongdoing in the public interest, the types of wrongdoing that may be disclosed, the protection of ‘public’ as opposed to internal or regulatory whistleblowing, compensation mechanisms for aggrieved whistleblowers, and how best to codify the obligations of all employers — public or private — towards employees who blow the whistle in the public interest. This analysis...