This study examines and analyzes the efforts to combat money laundering crimes in the Sultanate of Oman by reviewing national legislation and its compatibility with international standards, with the aim of enhancing the effectiveness of national and international efforts in combating money laundering crimes and reducing the challenges that hinder the prosecution of perpetrators by improving legislation and enhancing cooperation and coordination between countries. The importance of the study lies in shedding light on the crime of money laundering, which does not receive sufficient media and security coverage in Oman, which requires directing and alerting individuals to its danger at the local and international levels, by highlighting international, regional and local efforts in combating money laundering, with a focus on penalties and international legal cooperation to collect evidence and extradite criminals, while evaluating the effectiveness of the Omani legal system in addressing these crimes and its compatibility with international agreements. The problem of the study is the effectiveness of international cooperation in combating money laundering crimes according to Omani legislation, by analyzing the extent to which Omani legislation, especially Law No. (30/2016), is compatible with the international standards and agreements adopted in this field. It concluded that Omani legislation, especially Law No. (30/2016), shows a commitment to international agreements and provides an effective legal framework based on international standards. However, the legislation faces challenges related to delayed judicial procedures and weak international coordination, which hinders full implementation. The study recommended strengthening mechanisms for exchanging financial information between countries more quickly and efficiently, with the use of modern protocols that protect data and facilitate international cooperation to improve the fight against cross-border money laundering crimes. Keywords: International legal cooperation, money laundering crimes, legal assistance, international efforts, obstacles to international cooperation, national efforts.