A patient developed recurrent anti-glomerular basement membrane (GBM) antibody (ab) disease after twelve years of an uneventful posttransplant course, clinically accompanied by rapidly rising creatinine. He additionally exhibited coexisting IgA nephropathy at the time of the reappearing anti-GBM disease. Both linear IgG and mesangial IgA were detected by immunofluorescence, and electron microscopy demonstrated mesangial immune complex deposits. To our knowledge, the association of anti-GBM ab disease and IgA nephropathy has not been reported previously.