Whistleblower protection is a vital part of freedom of speech and has multiple effects such as preventing potential corrupt actions and providing advice or evidence that will help prosecute corrupt activities. The United States and the United Kingdom are the leading countries in whistleblower protection. Europe has major corruption issues and one of the most significant anti-corruption mechanism are the whistleblowers and the information they aquire, most often at their workplace. The European Parliament has drafted two reports calling for whistleblower protection throughout the EU, and the EU Council has issued a public statement demonstrating its support to the problem. Whistleblowers are a target of retribution. They are facing exclusion from the collective meetings, loss of tips, receiving less desirable work tasks, obtaining unsolicited or difficult tasks, more strict criticism, pressure, getting fired etc.. When the legal protection is completed, the risk that whistleblowers are being exposed to is less, which encourages employees to report illegal and immoral activities within the organization. Based on this, the Commission initiated a public debate and impact assessment, which are the first steps before proposing the law. The results of the public debate have shown great support for making the law at EU level that would set common standards for whistleblowers in the private and public sectors for all member states. The Republic of Croatia does not have a special law that protects whistleblowers but is not the only EU member state with poor protection. In the follow-up of this thesis the terms of the whistling and the whistleblower will be defined, the theoretical hypotheses will be presented in terms of whistling as morally permissible or mandatory actions and whistling as a conflict between ethics and law will be discussed. The laws on the protection of whistleblows in the United States, the United Kingdom, Romania, France and Finland will be described. Furthermore, the legal protection of whistleblowers in Croatia will also be analyzed and the readers will be introduced to associations and organizations that advocate for greater protection of whistleblowers, as well as with famous Croatian whistleblower. The thesis will display an interview with Dr. Drazen Gorjanski in order to find out more about Croatian whistleblowers, achieved and planned projects and difficulties in fighting for the vote of the Whistleblower Protection Act