This article examines the evolution of punishments in the Iranian criminal law system in light of the influence of international public opinion and human rights documents. By analyzing the historical course of criminal laws, especially the laws passed in 1993, 1994, and 2019, the author shows that the tendency to reduce custodial punishments, gradually eliminate corporal punishments, and replace them with financial and social punishments is a clear manifestation of the Iranian criminal system's movement toward reform-oriented justice. On the other hand, the role of international institutions, the media, and human rights documents such as the Covenant on Civil and Political Rights, the Nelson Mandela Rules, and the Convention against Torture has been highlighted in guiding the country's criminal policies. In addition to explaining the impact of these factors on the evolution of sentencing, the article also addresses local challenges such as the conflict between jurisprudential rulings and global standards, the weakness of the executive and cultural infrastructure, and the limitation of specialized training. Finally, by emphasizing the need for continuous review, development of executive and supervisory institutions, and utilization of the capacities of comparative jurisprudence, the article emphasizes that reforming Iran's criminal system, although complex and time-consuming, is an inevitable necessity for achieving justice and promoting human dignity within the context of domestic and international law.