We describe a 13-year-old boy who developed acute renal failure associated with Gemella haemolysans pneumonia. At presentation he was found to have macroscopic hematuria associated with lobar pneumonia. Gemella haemolysans was isolated from blood cultures. Renal failure was detected on admission, progressed and dialysis was required until day 18. Renal impairment had resolved by 3 months after the initial presentation. Histopathology of a renal biopsy showed focal proliferative glomerulonephritis, but the predominant abnormality was tubular damage associated with erythrocyte casts in tubular lumina. We believe that tubular damage due to hematuria rather than the glomerular changes was the most likely cause of renal failure.