We report the case of a 45-year-old man admitted for severe autoimmune thrombopenia and neutropenia associated with chronic viral C hepatitis. After failed, intravenous gammaglobulin and corticosteroid therapy antiviral treatment with interferon and ribavirin was given for one year. Thrombopenia improved progressively during antiviral therapy and worsened after the end of treatment. Neutropenia improved during antiviral therapy. Two years after the end of treatment, serum RNA-HCV was positive, white cell count was normal and platelet count was 77 G/L. In conclusion, these results suggest that antiviral therapy may be useful in patients with auto-immune cytopenia associated with viral hepatitis C infection.