The issues of ensuring the rights and guarantees of such participants in the criminal process as the suspect and the accused are relevant for research at all times. Guarantees are the means in accordance with which the execution of the purpose of criminal proceedings is ensured. In order to further expand the guarantees of such participants as the suspect and the accused, the article analyzes the concept and significance of the procedural guarantees of the participants in the criminal process, in particular the suspect and the accused; their legal status; analysis of the rights and guarantees of the data of participants in the criminal process. The article applies the methodology of comparative legal analysis. In particular, the norms of national legislation are analyzed, as well as the norms of foreign countries on these issues (Russia, Kazakhstan and Germany). Based on the results of the analysis, proposals were developed to improve the guarantees of the rights and freedoms of suspected and accused persons in the criminal proceedings of the country. These proposals can be used to make amendments and additions to the criminal procedure legislation of the country.