This review summarizes recent progress in the immunologic aspects of parenchymal renal disease. Progress in understanding basic immune mechanisms of glomerular injury is outlined, including the roles of chemoattractants, adhesion molecules, metalloproteinases, and cytokines. Current basic and clinical studies of focal segmental glomerulosclerosis, membranous nephropathy, membranoproliferative glomerulonephritis, minimal-change nephropathy, and IgA nephropathy are summarized. Finally, research in glomerular involvement in systemic disorders, such as lupus nephritis, antineutrophil cytoplasmic antibody-associated syndromes, and human immunodeficiency virus-associated nephropathy, is reviewed.