This review gives a survey of the most important tubulo-interstitial and glomerular lesions in kidney transplants. Among the tubulo-interstitial lesions subcapsular interstitial fibrosis, acute tubular necrosis, cellular tubulo-interstitial rejection and Ciclosporin associated lesions are briefly described. The review of the glomerular lesions is focused upon intraglomerular coagulation, transplant glomerulitis and transplant glomerulopathy. Among the immunocomplex diseases the preexisting glomerular lesions are stressed. Furthermore the differential diagnosis between rejection associated glomerular lesions and glomerulonephritis is discussed. Finally the prognostic significance of the different morphologic lesions is outlined based on an analysis of 500 biopsies from Basel.