In recent years in Europe, the discussion about whistleblowers has been dominated by the issues related to the implementation of the EU directive on the protection of persons reporting breaches of EU law. These discussions mainly revolved around available tools to protect whistleblowers and incentives aimed at strengthening so-called ‘speak-up’ policies. However, the issue of whistleblowers has a much broader scope; information disclosed by a whistleblower can lead to many consequences for a company, including the fear of criminal proceedings. The protections implemented by the EU may lack equivalents in other jurisdictions andoften local regulations differ on issues such as whether a whistleblower can receive an award for reporting misconduct. We will discuss the challenges and best practices for representing clients in light of these varied legal regimes.