Opportunistic viral infections make an important threat to renal transplant recipients (RTRs), and with the use of more intense newly-developed immunosuppressive drugs; the risk of renal allograft loss due to reactivation of these viruses considerably increased. At the top priority of these viruses, human cytomegalovirus and other herpes viruses in addition to polyomavirus, reactivation of these viruses in these chronically immunosuppressed RTRs can lead to renal impairment and subsequently loss, unless early detected and properly treated. Keywords: kidney transplantation, viral infections Citation: Al-Obaidi AB, Jasim MB, Hussein MR, Kadhim HS, Habib MA. Opportunistic viral infections after kidney transplantation: A review. Iraqi JMS. 2020; 18(2): 79-93. doi: 10.22578/IJMS.18.2.1