We report the case of a 36 year-old-patient, hemodialyzed for idiopathic membranous glomerulonephritis, who suffers from type I membranoproliferative glomerulonephritis five years after a successful kidney transplantation. Etiologic evaluation evidenced chronic viral hepatitis C complicated by type III cryoglobulinemia. If hepatitis C induced membranoproliferative glomerulonephritis has yet been described among non transplanted patients, it is at our knowledge, the first observation in a renal transplant recipient.