Background: The patients with liver disease are know to have a higher prevalence of glucose intolerance, preliminary studies suggest that hepatitis V (HCV) infection may be an additional risk factor for the development of diabetes mellitus. Objective: To determine the proportion of type 2 diabetes mellitus disease in hepatitis C virus infected patients. Subjects and Method: We performed retrospective study on 83 hepatitis C virus infected patients aged 30 and more at the Unite of hepatic research and treatment of ChoRay Hospital from 01/2010 to 12/2010.