In hepatitis B or hepatitis C endemic areas, the number of patients with dual infections is substantial. In such patients, interferon-alpha plus ribavirin can achieve sustained hepatitis C virus (HCV) clearance and hepatitis B e antigen (HBeAg) seroconversion. Pegylated interferon (PegIFN), an established treatment for hepatitis C, is currently increasingly recognized as an efficient therapy for hepatitis B. No case of successful use of PegIFN plus ribavirin has yet been reported, however, in hepatitis B virus (HBV) and HCV coinfection. We report on a 32-year-old man, of Kampuchean origin, with chronic hepatitis B, as documented by the presence of hepatitis B surface antigen with HBeAg, who was coinfected with HCV genotype 1. On therapy with PegIFN-alpha2b plus ribavirin, HCV RNA became undetectable at week 17. At the end of the 48 weeks of treatment, HCV RNA was still undetectable, HBV DNA was reduced and HBeAg remained positive. Twelve weeks after the end of treatment, HBV DNA reduction was followed by HBeAg to anti-HBe seroconversion. Two years after the end of treatment, HCV RNA and HBV DNA were still undetectable, and HBeAg to anti-HBe seroconversion was maintained. We conclude that the combination of PegIFN plus ribavirin may induce suppression of both viral infections.