The systemic lupus erythematosus is a self-perpetuating disease with multisystem involvement, ie ; skin, kidney, serous membrane, nervous system and other organs. The mortality in SLE is determined primarily by the extent of renal involvement ana the degree of immunosuppression resulting from the therapy. We experienced two cases of lupus nephritis in SLE with clinical, serologic, immunologic and pathologic evaluations. Renal biopsy revealed focal and segmental proliferative glomerulonephritis and mesangial proliferative glomerulonephritis. Both patients have been improving with prednisolone on follow-up studies.