In this article we present the case report of a 67-year-old male with a nephrotic syndrome due to a proliferative glomerulonephritis, associated with an angioimmunoblastic T-cell lymphoma. Diagnosis was made on an axillary lymph node biopsy and showed expanded T-cell areas with multiple blood vessels, small mature lymphocytes, eosinophils, and plasma cells. A kidney biopsy was suggestive for a proliferative glomerulonephritis with intra- and extracapillary proliferation. Hypercellular glomeruli were seen, as well as multiple floride crescents. Interstitial edema and fibrosis were absent. Immunohistochemical reactions were negative; there was some mesangial reaction with IgM in the glomeruli. Treatment with high-dose corticosteroids was initiated, with clinical improvement, and was immediately followed by therapy with cyclophosphamide, hydroxydaunomycin, vincristine, and prednisone (CHOP), which induced complete remission with a follow-up of 1 year. To our knowledge, the association of angioimmunoblastic T-cell lymphoma and proliferative glomerulonephritis has only been described twice. It concerned elderly men who developed acute renal failure a couple of months after the diagnosis of an angioimmunoblastic T-cell lymphoma. In both, immunoglobulin-containing dense deposits within glomeruli were observed, which was not the case in our patient, where only some mesangial colorization of the IgM in the glomeruli was seen.