The broad subject of consumer protection is explored in this diploma thesis, with a special emphasis on the Republic of Croatia. The research includes a number of crucial aspects of consumer protection, including an examination of the idea itself, a review of consumer contracts, and the dissemination of helpful consumer information. Additionally, it critically assesses Croatia's legal system, explores the function and efforts of the Croatian Association for Consumer Protection, and assesses the degree to which Croatia's legal system complies with EU consumer protection legislation. The thesis also looks at how Croatia's adoption of the Euro has affected consumer protection. Evaluating how this transformation may impact consumer rights, market dynamics, and overall consumer welfare is critical given that the Euro will soon be fully integrated into the Croatian economy. This research intends to offer insights into guaranteeing efficient consumer protection in the new monetary environment by examining the possible possibilities and problems posed by the adoption of the Euro. The investigation of real-world instances to highlight consumer protection problems, a thorough analysis of a survey questionnaire focusing on the security of online purchasing, and subsequent discussions make up the research methodology used in this study. This study offers a thorough knowledge of consumer protection in Croatia by fusing theoretical frameworks with actual data. The results of this study have consequences for businesses, consumers, consumer protection organizations, and regulators. This thesis seeks to support efforts to strengthen consumer protection laws in the Republic of Croatia by identifying strengths, flaws, and potential improvement areas.