Complement component 3 glomerulopathy (C3G) is a recently defined entity comprising dense deposit disease and C3 glomerulonephritis. It is associated with nonrenal diseases such as diabetes mellitus (DM) type 1, ocular drusen, acquired partial lipodystrophy, and monoclonal gammopathy of undetermined significance. We describe a case of 13-year-old boy of the known case of type 1 DM, who developed proteinuria, and swelling over his face, and lower limbs, which on renal biopsy, was diagnosed as a case of C3G.