This article deals with the comparative analysis of criminal justice with similar concepts in Iranian law, which is significant in two ways. First, criminal justice plays a fundamental role in promoting legal and social security; Because based on the principles of justice, judicial decisions must be made in order to realize justice and legal security of individuals. Secondly, in the context of international law, criminal justice is essential to maintain the principles and independence of laws, which plays a significant role in international interactions and international relations. In other words, this research not only explains the importance of criminal justice in Iran's legal system, but also emphasizes that the connection and coordination of this concept with international legal principles is essential and essential. The purpose of this research is not only to explain the importance of criminal justice in Iran's legal system, but also to examine how this concept can help improve the country's judicial processes and promote the independence and legal security of Iranian citizens. Emphasizing the connection and adaptation of this concept with international legal standards, this research provides suggestions for improving judicial policies and processes in Iran.