Post-infectious glomerulonephritis is one of the most common causes of acute glomerulonephritis. A retrospective study of post-infectious glomerulonephritis at King Chulalongkorn Memorial Hospital, Thailand was performed from January 1999 to December 2005. Among thirty six patients, eight cases were post-streptococcal glomerulonephritis and twenty eight cases were post non-streptococcal Glomerulo Nephritis (GN). Most cases present with edema, hypertension, gross hematuria and nephrotic-range proteinuria. C3 and CH50 commonly were low. Post-streptococcal glomerulonephritis had more aggressive pathology compared to the others. However the long term outcome was excellent. In the present study the authors found ESRD in only 14.3% (4 out of 28 cases) that reflects the excellent prognosis of post-infectious glomerulonephritis. Of interest, all of the ESRD patients were caused by post non-Streptococcal GN. Even though, no statistic was achieved; it might reflect the aggressiveness of non-Streptococcal pathogen.