The article aims to present the issue of the principle of dual (double) criminality and analyze its impact on the fight against organized crime in the European Union. It assesses the differences in the legal systems and definitions of offences in the various Member States. The dual criminality regulation is briefly discussed, and the issue of the European Arrest Warrant and the European Investigation Order is addressed. The article also considers the role of technology and international cooperation in overcoming obstacles related to dual criminality. Key issues are defined and proposals for new solutions and reforms that can improve international cooperation in the fight against organized crime are discussed.