New onset diabetes after transplantation (NODAT) is a common complication after solid-organ transplantation and is associated with increased cardiovascular morbidity, mortality, and graft loss. The risk factors for NODAT include older age, ethnicity, genetic factors,obesity, family history of diabetes, hepatitis C virus infection, and immunosuppressant use (corticosteroids, calcineurin inhibitors, and mTOR inhibitor). Management of NODAT must be considered at the pre-transplantation stage in order to properly screen high-risk patients. Although NODAT management is similar to that of general type 2 diabetes, some specific considerations must be made in NODAT management, including the interactions between anti-diabetes medication and immunosuppressive agents. (J Korean Diabetes 2014;15:134-141)