13 patients with bladder diverticula underwent transurethral diverticulectomy. Follow-up cystograms were obtained six months after surgery. The diverticulum had shrunk in all cases and had totally disappeared in 11 (85%). Transurethral diverticulectomy is a simple, effective, and safe procedure. It takes only a short time and can easily be combined with transurethral operations for obstructions of the lower urinary tract.