The 2 million persons incarcerated in US prisons and jails are disproportionately affected by hepatitis B virus (HBV), hepatitis C virus (HCV) and HIV, with prevalences of infection two to ten times higher than in the general population. Infections are largely due to sex- and drug-related risk behaviors practised outside the correctional setting, although transmission of these infections has also been documented inside jails and prisons. Public health strategies to prevent morbidity and mortality from these infections should include hepatitis B vaccination, HCV and HIV testing and counseling, medical management of infected persons, and substance abuse treatment in incarcerated populations.