This study aims at stating the role of the banks in fighting money laundering operations. I have touched thru it by acquainting with the phenomenon of money launderinge its history and phases of money laundering operations of different kinds as regards traditional and modern theory and methods of money laundering. The study includes effects and risks of this phenomenon economically and socially. The study has dealt with issue of fighting money laundering in international conventions and comparative legislations. The study has approached the issue of fighting in the Omani legislation prior to the issuance of a law for money laundering thru which I have indicated the international conventions in which the Sultanate has joined for the sake of international cooperation in fighting money launderings role of Central Bank of Oman in controlling the other banking institutions and fighting money laundering thru texts of narcotic and mental effects law. I have clarified in the study the subject relating to banks and its role in fighting money laundering as well as its commitments in the Sultanate of Oman represented by precautionary procedures to prevent fighting money laundering operations facilitate its discovery and commitment of the banks in banking secrecy and its relation with money laundering. Finallys hi have indicated to some conclusions we have reached thru the title of the study and the recommendations we have reached.