Mucormycosis is rare and highly lethal after organ transplantation. Kidney recipients are at higher risk of this infection because of some predisposing factors such as diabetes and tight immunosuppressive regimens. This is a report of 7 cases of mucormycosis infections, in patients who had been transplanted and admitted in the kidney transplant department of Baqyiatallah Hospital in Tehran, Iran.We retrospectively reviewed the hospital records of patients for demographic data, symptoms, ways of diagnoses and outcomes of 7 patients with final diagnosis of mucormycosis who admitted in our center in 2002-2005. Five patients were male and 2 patients were female. The mean (SD) age of patients was 49.5 ± 11.5. The time between transplantation and the onset of disease varied greatly, from 4 days to 4 years. Presenting symptoms were fever (100%), respiratory distress (57%) and severe headache (43%). Suspected patients were evaluated by CT scan, BAL and biopsy and diagnosis confirmed by culture. The final diagnosis was pulmonary mucormycosis in 4 cases (57.1%), rhinocerebral in 2 cases (28.5%) and both in 1 case (14.4%). Despite early and intensive treatment with amphotericine B in all patients and extensive debridment in one case, no patient survived the disease. Mucormycosis in a kidney recipient is a potentially lethal complication. It could occur very early or very late in post-transplant period. Despite the results of other studies, the most frequent site of infection in our patients was lungs other,. It seems that mucormycosis has a poor outcome despite the early diagnosis and aggressive treatment.