In this master's thesis, the right to inspect the case file in the criminal procedure was examined. The focus was primarily on the international normative framework of the right to inspect the case file through a review of the European Convention on Human Rights within the framework of the Council of Europe and Directive 2012/13/EU on the right to information in criminal proceedings. In order to provide a comprehensive overview, the case law of the European Court of Human Rights and the Court of Justice of the European Union was consulted. After analyzing the supranational level in the thesis, attention shifted to the internal (domestic) regulation of the right to inspect the case file in the criminal procedure. Through the Criminal Procedure Act and the Rules of Procedure of the State Attorney's Office, an interesting overview was provided of how the Croatian legislator transposed the aforementioned international documents into its own legal order and framework. The most important judgments analyzed in this master's thesis include the judgment of the European Court of Human Rights in the case of Dolenec against the Republic of Croatia, as well as judgments of Croatian courts that serve as indicators that this significant right of defense in criminal procedure is respected. The right to inspect the case file in a criminal matter is undoubtedly the foundation of a fair proceeding before competent authorities, and this master's thesis emphasizes its importance for the accused and their defense.